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<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" 
"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" [
	<!ENTITY legal SYSTEM "legal.xml">
	<!ENTITY appversion "2.28.x">
	<!ENTITY manrevision "3.1">
	<!ENTITY date "July 2005">
	<!ENTITY app "Passwords and Keys">
	<!ENTITY daemon "<application>seahorse-daemon</application>">
	<!ENTITY project "Seahorse">
	<!ENTITY key "<glossterm>key</glossterm>">
	<!ENTITY website "http://www.gnome.org/projects/seahorse/">
]>
<article id="index" lang="en">
	<articleinfo>
		<title>&app; Manual</title>
		<copyright>
			<year>2005, 2006, 2007, 2008, 2009</year>
			<holder>Jacob Perkins and Adam Schreiber</holder>
		</copyright>
		<publisher role="maintainer">
			<publishername>Seahorse Project</publishername>
		</publisher>
		<!-- link to document containig the legal notice of GNU FDL  -->
		&legal;
		<authorgroup>
			<author>
				<firstname>Jacob</firstname>
				<surname>Perkins</surname>
				<affiliation>
					<orgname>Seahorse Project</orgname>
					<!--
					<address>
						<email>jap1@users.sourceforge.net</email>
					</address>
					-->
				</affiliation>
			</author>
			<author>
				<firstname>Adam</firstname>
				<surname>Schreiber</surname>
				<affiliation>
					<orgname>Seahorse Project</orgname>
					<address>
						<email>sadam@clemson.edu</email>
					</address>
				</affiliation>
			</author>
			<author>
				<firstname>Paul</firstname>
				<surname>Cutler</surname>
				<affiliation>
					<orgname>GNOME Documentation Project</orgname>
					<address>
						<email>pcutler@foresightlinux.org</email>
					</address>
				</affiliation>
			</author>
		</authorgroup>
		<releaseinfo revision="2.28" role="draft">
		</releaseinfo>
		<publisher role="maintainer">
			<publishername>Seahorse Project</publishername>
		</publisher>
		<publisher role="maintainer">
			<publishername>GNOME Documentation Project</publishername>
		</publisher>
		<revhistory>
			<revision>
				<revnumber>&app; Manual V2.11.0</revnumber>
				<date>May 2009</date>
				<revdescription>
					<para role="author">
						Paul Cutler
						<email>pcutler@foresightlinux.org</email>
					</para>
				</revdescription>	
			</revision>
			<revision>
				<revnumber>&app; Manual V0.10.1</revnumber>
				<date>August 2008</date>
				<revdescription>
					<para role="author">
						Adam Schreiber
						<email>sadam@clemson.edu</email>
					</para>
				</revdescription>	
			</revision>
			<revision>
				<revnumber>&app; Manual V0.9.1</revnumber>
				<date>November 2006</date>
				<revdescription>
					<para role="author">
						Milo Casagrande
						<email>milo_casagrande@yahoo.it</email>
					</para>
				</revdescription>	
			</revision>
			<revision>
				<revnumber>&app; Manual V0.9.0</revnumber>
				<date>July 2005</date>
				<revdescription>
					<para role="author">Adam Schreiber
						<email>sadam@clemson.edu</email>
					</para>
					<para role="publisher">Seahorse Project</para>
				</revdescription>
			</revision>
			<revision>
				<revnumber>&app; Manual V0.7.0</revnumber>
				<date>February 2003</date>
				<revdescription>
					<para role="author">Jacob Perkins
					<!--
					<email>jap1@users.sourceforge.net</email>
					-->
					</para>
					<para role="publisher">Seahorse Project</para>
				</revdescription>
			</revision>
		</revhistory>
		<releaseinfo>This manual describes version &appversion; of &app;</releaseinfo>
		<legalnotice>
			<title>Feedback</title>
			<para>To report a bug or make a suggestion regarding the
				<application>&app;</application> application or this manual, follow the directions in the
				<ulink url="help:gnome-feedback" type="help">Gnome Feedback Page</ulink>.
			</para>
		</legalnotice>

		<abstract role="description">
			<para>
				<application>&app;</application> is the application for managing encryption keys for the GNOME Desktop
			</para>
		</abstract> 		

	</articleinfo>

	<indexterm zone="index">
		<primary>Seahorse</primary>
	</indexterm>

	<indexterm zone="index">
		<primary>seahorse</primary>	
	</indexterm>

	<indexterm zone="index">
		<primary>Encryption Keys</primary>
	</indexterm>
	
	<!-- ============= Introduction ============================== -->

  <sect1 id="introduction">
    <title>Introduction</title>
    <para>
      You can use <application>&app;</application> to create and  manage <acronym>PGP</acronym> and <acronym>SSH</acronym> keys.
    </para>
    <para>
      <application>&app;</application> provides a front end to many of the features of 
      <ulink url="http://www.gnupg.org" type="http">Gnu Privacy Guard (GPG)</ulink> and 
      integrates with multiple components of the <ulink url="http://www.gnome.org">GNOME</ulink> desktop. 
    </para>
			<para>
				With <application>&app;</application> you can:
				<itemizedlist>
				
				<listitem>
					<para>Create and manage PGP and SSH keys,</para>
				</listitem>
				<listitem>
					<para>Export and import PGP and SSH keys,</para>
				</listitem>
				<listitem>
					<para>Share your keys with others,</para>
				</listitem>
				</itemizedlist>
			</para>
	</sect1>

	<!-- ============= Getting Started ============================== -->
	  
	<sect1 id="seahorse-getting-started">
		<title>Getting Started</title>
		<sect2 id="seahorse-start">
			<title>Starting <application>&app;</application></title>
			<para>
				You can start <application>&app;</application> 
				in the following ways:
			</para>
			<variablelist>
				<varlistentry>
					<term><guimenu>Applications</guimenu> menu</term>
					<listitem>
						<para>Choose
						<menuchoice>
							<guimenu>Accessories</guimenu>
							<guimenuitem>Password and Keys</guimenuitem>
						</menuchoice>.</para>
					</listitem>
				</varlistentry>
				<varlistentry>
					<term>Command Line</term>
					<listitem>
						<para>
							Type <command>seahorse</command> then press <keycap>Return</keycap>.
						</para>
					</listitem>
				</varlistentry>
			</variablelist>
		</sect2>

		<sect2 id="seahorse-when-start">
			<title>When You Start <application>&app;</application></title>
			<para>
				When you start <application>&app;</application>, the <guilabel>Password and Keys</guilabel>
				window is displayed.
			</para>
			
			<figure id="seahorse-window">
			<title>The <application>&app;</application> Window</title>
			<screenshot>
				<mediaobject>
					<imageobject>
					<imagedata fileref="figures/seahorse-window.png" format="PNG"></imagedata>
					</imageobject>
					<textobject>
						<phrase>
							Show the <application>&app;</application> window.
						</phrase>
					</textobject>
				</mediaobject>
			</screenshot>
			</figure>
			
			<para>
				The <application>&app;</application> window contains the following elements:
			</para>
			
	    <variablelist>
		<varlistentry><term>Menubar</term>
		    <listitem>
			<para>The menus on the menubar contain all of the commands that you need to perform tasks in <application>&app;</application>.</para>
		    </listitem>
		</varlistentry>
		<varlistentry><term>Toolbar</term>
		    <listitem>
			<para>Use the toolbar to quickly access commonly-used commands.</para>
		    </listitem>	
		</varlistentry> 		
		<varlistentry><term>Keys and Passwords Tabs</term>
  		    <listitem>
			<para>Provides access to the keys and passwords in the keyring.</para>
  		    </listitem>
		</varlistentry>
		<varlistentry><term>First time options</term>
  		    <listitem>
			<para>Provides fast access to useful actions for first time users. From here you can:</para>
			<itemizedlist>
			    <listitem>
				<para>Browse the help system,</para>
			    </listitem>
			    <listitem>
				<para>Import keys in the keyring,</para>
			    </listitem>
			    <listitem>
				<para>Create new keys.</para>
			    </listitem>
			</itemizedlist>
		    </listitem>
		</varlistentry>
	    </variablelist>
	</sect2>
    </sect1>
	
	<!-- ============= Creating OpenPGP Keys ============================== -->	

  <sect1 id="pgp-generate">
    <title>Creating OpenPGP Keys</title>
    <para>
      OpenPGP is a non proprietary protocol for encrypting e-mail with the use of public key
      cryptography based on <acronym>PGP</acronym>. It defines standard formats for encrypted messages, signatures, private keys 
      and certificates for exchanging public keys. 
    </para>
    <para>
      Public key cryptography is a concept which involves the use of two keys:
      a <emphasis>public key</emphasis>, that you can give to anyone with whom
      you would like to communicate, and a <emphasis>private key</emphasis> which is
      private and must be kept secret.
    </para>
    <para>
      To create OpenPGP keys:
      <orderedlist>
	<listitem>
	  <para>
	    Choose <menuchoice><guimenu>File</guimenu><guimenuitem>New...</guimenuitem></menuchoice>
	  </para>
	</listitem>
	<listitem>
	  <para>
	    Select <guilabel>PGP Key</guilabel> and click <guibutton>Continue</guibutton>
	  </para>
	</listitem>
	<listitem>
	  <para>
	    Enter your full name (first - last), your e-mail address and any additional information. 
	    You can also specify advanced options for the key: see below. 
	  </para>
	</listitem>
	<listitem>
	  <para>
	    Click <guibutton>Create</guibutton> to create the new key pair.
	  </para>
	</listitem>
	<listitem>
	  <para>
	    The <guilabel>Passphrase for New PGP Key</guilabel> dialog will open. 
	    Enter the passphrase twice for your new key.
	  </para>
	</listitem>
      </orderedlist>
    </para>
    <tip>
      <para>
	Use similar practices to generating a strong password when choosing a 
	passphrase. The main difference between a password and a passphrase is that, 
	in a passphrase, spaces are valid characters.
      </para>				
    </tip>
    
    <sect2 id="seahorse-pgp-advanced-mode">
      <title>Advanced options</title>
      <para>
	Expand the <guibutton>Advanced key options</guibutton> 
	section to specify the following options for a new key:
      </para>
      <variablelist>
	<varlistentry>
	  <term><guilabel>Encryption Type</guilabel></term>
	  <listitem>
	    <para>
	      This field specifies the encryption algorithms used 
	      to generate your keys.
	    </para>
	    <variablelist>
	      <varlistentry>
		<term><acronym>DSA</acronym> ElGamal</term>
		<listitem>
		  <para>
		    This is the suggested choice as it will allow 
		    you to encrypt, decrypt, sign and verify as needed.
		  </para>
		</listitem>
	      </varlistentry>
	      <varlistentry>
		<term><acronym>DSA</acronym></term>
		<listitem>
		  <para>
		    Will allow signing only.
		  </para>
		</listitem>
	      </varlistentry>
	      <varlistentry>
		<term><acronym>RSA</acronym></term>
		<listitem>
		  <para>
		    Will allow signing only.
		  </para>
		</listitem>
	      </varlistentry>
	    </variablelist>
	  </listitem>
	</varlistentry>
	<varlistentry>
	  <term><guilabel>Key Strength (bits)</guilabel></term>
	  <listitem>
	    <para>
	      This is the length of the key in bits. The longer the key, 
	      the more secure it will be, provided a strong passphrase is
	      used. Conversely, performing any operation with a longer key 
	      will require more time than it would with a shorter key. Acceptable 
	      values are between 1024 and 4096 bits. At least 2048 bits is recommended.
	    </para>
	  </listitem>
	</varlistentry>
	<varlistentry>
	  <term><guilabel>Expiration Date</guilabel></term>
	  <listitem>
	    <para>
	      This is the date at which the key will cease to be usable for 
	      performing encryption or signing operations. 6 months is a reasonable time 
	      to set it to. You will have to either change the 
	      expiration date or generate a new key or subkey after this amount 
	      of time passes.  
	      <note>
		<para>
		  Sign your new key with your old one before it expires 
		  to preserve your trust status.
		</para>
	      </note>
	    </para>
	  </listitem>
	</varlistentry>
      </variablelist>
    </sect2>
  </sect1>
	
	<!-- ============= Creating SSH Keys ============================== -->	
	
	<sect1 id="ssh-generate">
	<title>Creating Secure Shell Keys</title>
	<para>
		Secure Shell (<acronym>SSH</acronym>) is a way of logging into a remote computer to execute commands 
		on that machine. 
		SSH keys are used in key-based authentication system, as an alternative to the default password 
		authentication system.
		With key-based authentication there is no need to manually type a password to authenticate. 
	</para>
	<para>
		Secure Shell keys are made of two keys: a <emphasis>private key</emphasis>, that must be kept secret, 
		and a <emphasis>public key</emphasis> which can be uploaded to any computer you need to access.
	</para>
    <para>
      To create a Secure Shell key:
    </para>
    <orderedlist>
      <listitem>
        <para>Choose <menuchoice><guimenu>File</guimenu><guimenuitem>New...</guimenuitem></menuchoice></para>
      </listitem>
      <listitem>
        <para>Select <guilabel>Secure Shell Key</guilabel> and click <guibutton>Continue</guibutton></para>
      </listitem>
      <listitem>
        <para>Enter a description of what the key is to be used for. You can use your e-mail address or any other reminder. You can also specify advanced options for the key: see below.</para>
      </listitem>
      <listitem>
        <para>Click <guibutton>Just Create Key</guibutton> to 
				create the new key, or <guibutton>Create and Set Up</guibutton> 
				to create the key and set up another computer to use it for authentication.</para>
      </listitem>
      <listitem>
        <para>The <guilabel>Passphrase for New Secure Shell Key</guilabel> 
				 dialog opens.
				 Enter the passphrase twice for your new key.
			</para>
			<tip>
				<para>
					Use similar practices to generating a 
					strong password when choosing a 
					passphrase. The main difference between a 
					password and a passphrase is that, in a 
					passphrase, spaces are valid characters.
				</para>				
			</tip>
      </listitem>
    </orderedlist>
    

		
		<sect2 id="seahorse-ssh-advanced-options">
		<title>Advanced options</title>
			<para>
			  Expand the <guilabel>Advanced key options</guilabel> section to specify the following options for a new key:
			</para>
		
			<variablelist>
			<varlistentry>
				<term><guilabel>Encryption Type</guilabel></term>
				<listitem>
				<para>
					This field specifies the encryption 
					algorithms used to generate your key.
				</para>
				<variablelist>
					<varlistentry>
						<term><acronym>RSA</acronym></term>
						<listitem>
							<para> 
								Use the <emphasis>Rivest-ShamirAdleman</emphasis> 
								(<acronym>RSA</acronym>) algorithm to create the SSH key. 
								This is the preferred and more secure choice.
							</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term><acronym>DSA</acronym></term>
						<listitem>
							<para>
								Use the <emphasis>Digital Signature Algorithm</emphasis> 
								(<acronym>DSA</acronym>) to create the SSH key.
							</para>
						</listitem>
					</varlistentry>
				</variablelist>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><guilabel>Key Strength (bits)</guilabel></term>
				<listitem>
				<para>
					This is the length of the key in bits.  
					The longer the key, the more secure it 
					will be, provided a strong passphrase is
					used.  Conversely, performing any
					operation with a longer key will require 
					more time than it would with a shorter 
					key.  Acceptable values are between 1024 
					and 4096 bits.  At least 2048 bits is recommended.
				</para>
				</listitem>
			</varlistentry>
			</variablelist>
		</sect2>
	</sect1>
	
	<!-- ============= OpenPGP Key Properties ============================== -->	

	<sect1 id="seahorse-key-properties">
		<title>OpenPGP Key Properties</title>
		<para>
			The descriptions in this section apply to all OpenPGP keys.
		</para>
		
		<para>
			To view properties of a <acronym>PGP</acronym> key:
		<itemizedlist>
			<listitem>
				<para>
					Select the <acronym>PGP</acronym> key 
					from the main window,
				</para>
			</listitem>
			<listitem>
				<para>
					Double click on it or choose <guilabel>Properties</guilabel> 
					from the toolbar,
				</para> 
			</listitem>
			<listitem>
				<para>
					Select the <guilabel>Details</guilabel> tab.
				</para>
			</listitem>
		</itemizedlist>
		</para>

	<sect2 id="pgp-public-key-properties">
		<title id="pgp-private-key-properties">Properties</title>
		<para>
		<variablelist>
			<varlistentry>
				<term><guilabel>Fingerprint</guilabel></term>
				<listitem>
					<para>The fingerprint is a unique string of characters that exactly identifies a key.</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><guilabel>KeyID</guilabel></term>
				<listitem>
					<para>
						The KeyID is similar to the Fingerprint. However the KeyID only contains the last 8
						characters of the fingerprint. Most of the time it is possible to identify a key with 
						only the KeyID, but occasionally two keys may have the same ID.
					 </para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><guilabel>Type</guilabel></term>
				<listitem>
					<para>
						Specifies the encryption algorithm used to generate a key. DSA keys can only sign. 
						ElGamal keys are used to encrypt. 
					</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><guilabel>Created</guilabel></term>
				<listitem>
					<para>
						Indicates the date the key was created.
					</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><guilabel>Expires</guilabel></term>
				<listitem>
				<para>
					Indicates the date the key can no longer be used.
				</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term><guilabel>Strength</guilabel></term>
				<listitem>
					<para>
						Indicates the length in bits of a key.  In general the longer the key, the more security it 
						provides.
						<note>
							<para>
								A long key is not enough to make up for the use of a weak passphrase.
							</para>
						</note>  
					</para>
				</listitem>
			</varlistentry>
		</variablelist>
		</para>
	</sect2>

	<sect2 id="change-owner-trust">
		<title>Trust</title>
		<para>
  			Trust is an indication of how sure you are of a person's ability to correctly extend 
			the web of trust.  When you are faced with a key you have not signed, the validity of 
    			that person's key will be determined based on the signatures they have collected and 
			how well or not you trust the people who have made those signatures.  By default, an 
			unknown key will require 3 signatures with marginal trust value or 1 fully trusted signature.
		</para>
		<itemizedlist>
			<listitem><para>
			    <guilabel>Unknown</guilabel>: You are not familiar with the person's ability to sign keys correctly.
			</para></listitem>
			<listitem><para>
			    <guilabel>Never</guilabel>: This person cannot correctly sign keys.
			</para></listitem>
			<listitem><para>
			    <guilabel>Marginal</guilabel>: This person checks for photo ID before signing a key, but 
			    does not necessarily scrutinize the IDs.
			</para></listitem>
			<listitem><para>
			    <guilabel>Full</guilabel>: This person scrutinizes each and every person's photo IDs before
			    signing them (e.g. they only sign keys that truely belong to the person asking for the signature). 
		    </para></listitem>
			<listitem><para>
			    <guilabel>Ultimate</guilabel>: This level of trust should only be assigned to your own keys.
			</para></listitem>
		</itemizedlist>
	</sect2>

	<sect2 id="disable-key">
		<title>Enabling and Disabling Keys</title>
		<para>
			When a key is enabled, it can be used to perform encryption operations. 
			When a key is disabled, it cannot be used to encrypt to or verify signatures made by it.
		</para>
	</sect2>

	<sect2 id="change-expires">
		<title>Expiration Date</title>
		<para>
			A key can no longer be used to perform key operations after it has expired. Changing a 
			key's expiration date to a point in the future re-enables it. A good general practice 
			would be to have a master key that never expires and multiple subkeys that do and are 
			signed by the master key.
		</para>
	</sect2>

	<sect2 id="userid-properties">
		<title>User IDs</title>
		<para>
			User IDs allow multiple identities and email addresses to 
			be used with the same key.
		</para>
		<para>
			They usually take the form of: 
			<programlisting>Name (comment) &lt;email address&gt;</programlisting>
		</para>
			
		<sect3 id="add-uid">
			<title>Adding a User ID</title>
				<para>
					Adding a user ID is useful when you want to have 
					an identity for your job and one for your friends. 
				</para>
				<para>
					To add a user ID to a key:
					<itemizedlist>
						<listitem>
							<para>
								Select the key from the main window,
							</para>
						</listitem>
						<listitem>
							<para>
								Double click on it or choose <guibutton>Properties</guibutton> from the toolbar,
							</para>
						</listitem>
						<listitem>
							<para>
								Select the <guilabel>Names and Signatures</guilabel> tab,
							</para>
						</listitem>
						<listitem>
							<para>
								Click on <guibutton>Add Name</guibutton>.
							</para>
						</listitem>
					</itemizedlist>
				</para>
				<para>
					After following the instructions above, you will be presented with a 
					dialog to fill in. The fields are detailed below. 	
				</para>
				<variablelist>
					<varlistentry>
						<term><guilabel>Full Name</guilabel></term>
						<listitem>
							<para>
								Enter your full name in the form
								<programlisting>&lt;first&gt; &lt;last&gt;</programlisting>
								A middle name or initial is optional.
							</para>
							<para>
								<note>
									<para>
										You must enter at least 5 characters in this field.
									</para>
								</note> 
							</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term><guilabel>Email Address</guilabel></term>
						<listitem>
							<para>
								Your email address is how most
								people will locate your key on a
								key server or other key provider.
								Make sure it is correct before
								continuing.
							</para>
							<para>
								<note>
									<para>
										It should be of the form 
										<programlisting><replaceable>&lt;username&gt;</replaceable>@<replaceable>&lt;domainname&gt;</replaceable></programlisting>
									</para>
								</note>
							</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term><guilabel>Key Comment</guilabel></term>
						<listitem>
							<para>
								The comment field can be used to 
								place any additional information 
								into the displayed name of your new 
								ID. This information can be 
								searched for on key servers.
							</para>
						</listitem>
					</varlistentry>
				</variablelist>
			</sect3>
		</sect2>

    <sect2 id="photoid-properties">
      <title>Photo IDs</title>
      <para>
            Photo IDs allow a key owner to embed one or more pictures of themselves in a key.
            These identities can be signed just like normal user IDs. A photo ID must be in JPEG 
            format and is recommended to be no larger than 240x288 pixels.</para>
      <para>
	  If the chosen image is not of the required file type or size <application>&app;</application> 
	  can resize and convert it on the fly from 
	  any image format supported by the <acronym>GDK</acronym> library.
      </para>
    </sect2>
		
		<sect2 id="change-passphrase">
			<title>Changing the Passphrase</title>
			<para>
				To change the passphrase assigned to a key:
				<itemizedlist>
					<listitem>
						<para>
							Select the key from the main window,
						</para>
					</listitem>
					<listitem>
						<para>
							Double click on it or choose <guilabel>Properties</guilabel> from the toolbar,
						</para>
					</listitem>
					<listitem>
						<para>
							Click on <guibutton>Change Passphrase</guibutton>.
						</para>
					</listitem>
				</itemizedlist>
			</para>
			<para>
				Enter the new passphrase and click <guibutton>OK</guibutton>. 
			</para>
		</sect2>

		<sect2 id="delete">
			<title>Deleting a Key</title>
			<para>
				To delete a key from your keyring:
				<itemizedlist>
				<listitem>
					<para>
						Select the key from the main window,
					</para>
				</listitem>
				<listitem>
					<para>
						Right click on it and choose <guilabel>Delete Key</guilabel> 
						or choose 
						<menuchoice>
							<guimenu>Edit</guimenu>
							<guimenuitem>Delete Key</guimenuitem>
						</menuchoice>.
					</para>
				</listitem>
				</itemizedlist>
			</para>
			<note>
				<para>
					You can delete your keys, trusted keys and collected keys.
				</para>		
			</note> 
		</sect2>
	</sect1>
	
	<!-- ============= OpenPGP Properties ============================== -->	
		
	<sect1 id="subkey-properties">
		<title>OpenPGP Subkey Properties</title>
		<para>
			Each OpenPGP key has a single master key used 
			to sign only. Subkeys are used to encrypt and 
			to sign as well. In this way, if your sub key is 
			compromised, you don't need to revoke your master key.
		</para>
		<variablelist>
		<varlistentry>
			<term><guilabel>ID</guilabel></term>
			<listitem>
				<para>
					This is the identifier of the subkey.
				</para>
			</listitem>
		</varlistentry>
		<varlistentry>
			<term><guilabel>Type</guilabel></term>
			<listitem>
				<para>
					Specifies the encryption algorithm used to generate a subkey. 
					<acronym>DSA</acronym> keys can only sign, ElGamal 
					keys are used to encrypt while <acronym>RSA</acronym> keys are 
					used to sign or to encrypt.
				</para>
			</listitem>
		</varlistentry>
		<varlistentry>
			<term><guilabel>Created</guilabel></term>
			<listitem>
				<para>
					Indicates the date the key was created.
				</para>
			</listitem>
		</varlistentry>
		<varlistentry>
			<term><guilabel>Expires</guilabel></term>
			<listitem>
				<para>
					Indicates the date the key can no longer be used.
				</para>
			</listitem>
		</varlistentry>
		<varlistentry>
			<term><guilabel>Status</guilabel></term>
			<listitem>
				<para>
					Indicates the status of the key.
				</para>
			</listitem>
		</varlistentry>
		<varlistentry>
			<term><guilabel>Strength</guilabel></term>
			<listitem>
				<para>
					Indicates the length in bits of the key. In general the longer the key, the more security it 
					provides.
					<note>
						<para>
							A long key is not enough to make up for the use of a weak passphrase.
						</para>
					</note>
				</para>
			</listitem>
		</varlistentry>
		</variablelist>
		
		<sect2 id="add-subkey">
			<title>Adding a Subkey</title>
			<para>
				To add a subkey to a key, from the <guilabel>Subkeys</guilabel> 
				section click on <guibutton>Add</guibutton> button.
			</para>
			<para>
				After following the instructions above, you will be presented with a 
				dialog to fill in. The fields are detailed below. 	
			</para>
			<variablelist>
			<varlistentry>
				<term>Key Type</term>
				<listitem>
					<para>
						Specifies the encryption algorithm used to generate a subkey. 
					</para>
				<variablelist>
				<varlistentry>
					<term><acronym>DSA</acronym></term>
					<listitem>
						<para>
							Use the <emphasis>Digital Signature Algorithm</emphasis> 
							(<acronym>DSA</acronym>) to create the subkey. 
							This subkey can sign only.
						</para>
					</listitem>
				</varlistentry>
				<varlistentry>
					<term>ElGamal</term>
					<listitem>
						<para>
							Use the <emphasis>ElGamal</emphasis> algorithm to create the subkey.
							This subkey can encrypt only.
						</para>
					</listitem>
				</varlistentry>
				<varlistentry>
					<term>RSA</term>
					<listitem>
						<para>
							Use the <emphasis>Rivest-Shamir Adleman</emphasis> (<acronym>RSA</acronym>) 
							algorithm to create the subkey.  This subkey can be used to sign or encrypt, 
							but you have to create two different subkeys.
						</para>
					</listitem>
				</varlistentry>
				</variablelist>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term>Key Length</term>
				<listitem>
					<para>
						Indicates the length in bits of the subkey. 
						In general the longer the key, the more security it provides.
					</para>
				</listitem>
			</varlistentry>
			<varlistentry>
				<term>Expiration Date</term>
				<listitem>
					<para>
						Indicates the date the subkey can no longer be used.
					</para>
				</listitem>
			</varlistentry>
			</variablelist>
		</sect2>

		<sect2 id="change-subkey-expires">
			<title>Changing a Subkey Expiration Date</title>
			<para>
				To change a subkey expiration date, select 
				the subkey from the <guilabel>Subkeys</guilabel> 
				section, then:
				<itemizedlist>
				<listitem>
					<para>
						Click on the <guibutton>Expire</guibutton> button on the left,
					</para>
				</listitem>
				<listitem>
					<para>
						From the date dialog choose the new expiration date or select
						<guilabel>Never expires</guilabel> for no expiration date.
					</para>
				</listitem>
				</itemizedlist>
			</para>
		</sect2>

		<sect2 id="revoke-subkey">
			<title>Revoking a Subkey</title>
			<para>
				To revoke a subkey, select the subkey from the <guilabel>Subkeys</guilabel>
				section, then:
				<itemizedlist>
				<listitem>
					<para>
						Click on the <guibutton>Revoke</guibutton> button on the left,
					</para>
				</listitem>
				<listitem>
					<para>	
						Choose a reason why to revoke the subkey:
					</para>
					<para>
					<variablelist>
						<varlistentry>
							<term>No Reason</term>
							<listitem>
								<para>
									There isn't a specific reason to revoke the key. 
								</para>
							</listitem>
						</varlistentry>
						<varlistentry>
							<term>Compromised</term>
							<listitem>
								<para>
									The key has been compromised.
								</para>
							</listitem>
						</varlistentry>
						<varlistentry>
							<term>Superseded</term>
							<listitem>
								<para>
									The key has been superseded by another one.
								</para>
							</listitem>
						</varlistentry>
						<varlistentry>
							<term>Not Used</term>
							<listitem>
								<para>
									The key is not used anymore.
								</para>
							</listitem>
						</varlistentry>
					</variablelist>
					</para>
				</listitem>
				<listitem>
					<para>
						Enter a description of why you are revoking the key,
					</para>
				</listitem>
				<listitem>
					<para>
						Click on <guibutton>Revoke</guibutton>.
					</para>
				</listitem>
				</itemizedlist>
			</para>
			<note>
				<para>
					The effect of revoking a subkey is immediate.
				</para>
			</note>
		</sect2>

		<sect2 id="delete-subkey">
			<title>Deleting a Subkey</title>
			<para>
				To delete a subkey, select the subkey from the <guilabel>Subkeys</guilabel> 
				section, then:
				<itemizedlist>
				<listitem>
					<para>
						Click on the <guibutton>Delete</guibutton> button on the left.
					</para>
				</listitem>
				</itemizedlist>
			</para>
		</sect2>
	</sect1>

	<!-- ============= SSH Key Properties ============================== -->

	<sect1 id="ssh-key-properties">
	    <title>Secure Shell Key Properties</title>
	    <para>
	    	    The descriptions in this section apply to all <acronym>SSH</acronym> keys.
	    </para>
	    <para>
	    	    To view properties of a <acronym>SSH</acronym> key:
		<itemizedlist>
			<listitem>
				<para>
					Select the Secure Shell key 
					from the main window,
				</para>
			</listitem>
			<listitem>
				<para>
					Double click on it or choose <guilabel>Properties</guilabel> 
					from the toolbar,
				</para> 
			</listitem>
			<listitem>
				<para>
					Select the <guilabel>Details</guilabel> tab.
				</para>
			</listitem>
		</itemizedlist>
	</para>

	<sect2 id="properties">
		<title>Properties</title>
		<para>
		<variablelist>
		<varlistentry>
			<term><guilabel>Fingerprint</guilabel></term>
			<listitem>
				<para>
					The fingerprint is a unique string of 
					characters that exactly identifies a key.
				</para>
			</listitem>
		</varlistentry>
		<varlistentry>
			<term><guilabel>Algorithm</guilabel></term>
			<listitem>
				<para>
					Specifies the encryption algorithm used to 
					generate a key.
				</para>
			</listitem>
		</varlistentry>
		<varlistentry>
			<term><guilabel>Location</guilabel></term>
			<listitem>
				<para>
					This is the location where the 
					<emphasis>private key</emphasis> 
					has been stored.
				</para>
		</listitem>
		</varlistentry>
		<varlistentry>
			<term><guilabel>Strength</guilabel></term>
			<listitem>
				<para>
					Indicates the length in bits of a key. 
					In general the longer the key, the more 
					security it provides.
				<note>
					<para>
						A long key is not enough to make up 
						for the use of a weak passphrase.
					</para>
				</note>
				</para>
			</listitem>
		</varlistentry>
		</variablelist>
		</para>
	</sect2>

	<sect2 id="delete-ssh-key">
		<title>Deleting a Secure Shell Key</title>
		<para>
			To delete a Secure Shell key: 
			<itemizedlist>
				<listitem>
				<para>
					Select the <acronym>SSH</acronym> key from the main window,
				</para>
			</listitem>
			<listitem>
				<para>
					Right click on it and choose <guilabel>Delete key</guilabel> or choose 
					<menuchoice>
						<guimenu>Edit</guimenu>
						<guimenuitem>Delete Key</guimenuitem>
					</menuchoice>.
				</para>
			</listitem>
			</itemizedlist>
		</para>
	</sect2>
	</sect1>
	
	<!-- ============= Importing Keys ============================== -->	

        <sect1 id="import">
		<title>Importing Keys</title>
		<para>
			To import keys choose
			<menuchoice>
				<guimenu>File</guimenu>
				<guimenuitem>Import</guimenuitem>
			</menuchoice> and select, from the file chooser, a file containing at least one ASCII armored public key. 
		</para>
		<para>
			Importing can also be performed by pasting the keys inside <application>&app;</application>:
		<itemizedlist>
		<listitem>
			<para>
				Select an ASCII armored public block of text,
			</para>
		</listitem>
		<listitem>
			<para>
				Copy it to the clipboard,			
			</para>
		</listitem>
		<listitem>
			<para>
				Choose 
				<menuchoice>
					<guimenu>Edit</guimenu>
					<guimenuitem>Paste Keys</guimenuitem>
				</menuchoice>.
			</para>
		</listitem>
		</itemizedlist>
		</para>
	</sect1>
	
	<!-- ============= Exporting Keys ============================== -->	

	<sect1 id="export">
		<title>Exporting Keys</title>
		<para>
			To export keys, select the keys in the main window 
			and choose
			<menuchoice>
				<guimenu>File</guimenu>
				<guimenuitem>Export</guimenuitem>
			</menuchoice>. 
		</para>
		<para>
			You can also export keys to the clipboard in an 
			ASCII armored block of text:
		<itemizedlist>
			<listitem>
				<para>
					Select the keys in the main window,
				</para>
			</listitem>
			<listitem>
				<para>
					Choose 
						<menuchoice>
							<guimenu>Edit</guimenu>
							<guimenuitem>Copy Keys</guimenuitem>
						</menuchoice>.
				</para>
			</listitem>
		</itemizedlist>
		</para>
	</sect1>

	
	<!-- ============= Signing a Key ============================== -->	

	<sect1 id="sign">
		<title>Signing a Key</title>
		<para>
			Signing another person's key means you are giving trust to that person. 
			Before signing a key, you have to carefully check the key's fingerprint 
			to be sure that the key really belongs to that person.
		</para>
		<para>
			To sign a key in your keyring:
			<itemizedlist>
				<listitem>
				<para>
					Select the key you want to sign from the 
					<guilabel>Trusted Keys</guilabel> or 
					<guilabel>Other Collected Keys</guilabel> tabs,
				</para>
				</listitem>
				<listitem>
				<para>
					Choose <guibutton>Sign</guibutton> from the toolbar 
					or <menuchoice>
						<guimenu>File</guimenu>
						<guimenuitem>Sign</guimenuitem>
					</menuchoice>,
				</para>
				</listitem>
				<listitem>
				<para>
					Select how carefully the key has been checked,
				</para>
				</listitem>
				<listitem>
				<para>
					Indicate if the signature should be local to your keyring, 
					and if your signature can be revoked,
				</para>
				</listitem>
				<listitem>
				<para>
					Click on <guibutton>Sign</guibutton>.
				</para>
				</listitem>
			</itemizedlist>		
		</para>
	</sect1>
	
	<!-- ============= Preferences ============================== -->	
  
  <sect1 id="prefs">
    <title>Preferences</title>
    <para>
      This section describes the preferences settable in <application>&app;</application> by choosing 
	<menuchoice>
	  <guimenu>Edit</guimenu>
	  <guimenuitem>Preferences</guimenuitem>
	</menuchoice> from within <application>&app;</application>.
      </para>

        <sect2 id="keyring">
        	<title>Password Keyrings</title>
        	<sect3>
        	    <title>Creating Keyrings</title>
            	<para>
            	    To create a new keyring, from the menu choose <menuchoice><guimenu>File</guimenu><guimenuitem>New</guimenuitem></menuchoice> and choose <guibutton>Password Keyring</guibutton>.  Enter a name for the new keyring, and press enter. 
            	</para>
        	</sect3>
        	<sect3>
        	    <title>Changing Keyring Passwords</title>
            	<para>
            	  To change the unlock password of the keyring, first select the appropriate keyring and then 
            	  press <guibutton>Change Unlock Password</guibutton> button. You will then be prompted to
            	  type the old password in the <guilabel>Old password</guilabel> text box, the new password in the
            	  <guilabel>New password</guilabel> text box and
            	  confirm it in the <guilabel>Confirm password</guilabel> text box. 
            	  To apply the settings, press <guibutton>Change</guibutton>.
            	  If the old password is correct, you will get a status
            	  message indicating the success of the operation. If the
            	  old password is not correct you will be asked to check
            	  its correctness. 
            	</para>
        	</sect3>
        	<sect3>
        	    <title>Removing Keyrings</title>
        	    <para>
        	        To remove a keyring, first select the appropriate keyring and then 
            	  from the menu choose <menuchoice><guimenu>Edit</guimenu> <guimenuitem>Delete</guimenuitem></menuchoice>.
        	    </para>
        	</sect3>
        </sect2>

    <sect2 id="key-servers">
	<title>Key Servers</title>
	<para>
	  Keep your and other's keys up to date by syncing keys periodically with 
	  remote keyservers. Syncing will make sure that you have the latest 
	  signatures made on all of your keys so that the web of trust will be the 
	  most useful.
	</para>
	<para>
      	  <application>&app;</application> provides support for HKP and LDAP keyservers.
	</para>
	<variablelist>
	  <varlistentry>
	    <term><emphasis>HKP Servers</emphasis></term>
	    <listitem>
	      <para>
		HKP keyservers are ordinary web based keyservers such as the 
		popular <ulink url="hkp://pool.sks-keyservers.net" type="hkp">hkp://pool.sks-keyservers.net</ulink>, also accessible at
		<ulink url="http://sks-keyservers.net" type="http">http://sks-keyservers.net</ulink>.
	      </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term><emphasis><acronym>LDAP</acronym> Keyservers</emphasis></term>
	    <listitem>
	      <para>
		<acronym>LDAP</acronym> keyservers are less common, but use the standard LDAP 
		protocol to serve keys. 
		<ulink url="ldap://keyserver.pgp.com" type="ldap">ldap://keyserver.pgp.com</ulink> is a good LDAP 
		server. 
	      </para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>

      <sect2 id="key-sharing">
	<title>Key Sharing</title>
	<para>
	  Key Sharing is provided by DNS-SD, also known as Bonjour or Rendevous.  
	  Enabling key sharing will add the local <application>&app;</application> users' public key rings 
	  to the remote search dialog. Using these local "key servers" will most 
	  likely be faster than accessing remote servers.
	</para>
      </sect2>
  </sect1>
  
	<!-- ============= About ============================== -->  
      
    <sect1 id="about">
    <title>About &app;</title>
    <para> 
      <application>&app;</application>, its associated plugins, the preferences applet and the panel 
      applet are known collectively as &project;. &project; was written by Jacob Perkins. The current 
      maintainers are Stef Walter and Adam Schreiber. This manual is by Adam Schreiber. The project's web 
      site was designed by Jim Pharis. To find more information about &project;, the project , please visit 
      the <ulink url="http://www.gnome.org/projects/seahorse/" type="http">&project; web page</ulink>.
    </para>
    <para>
      To report a bug or make a suggestion regarding this application or
      this manual, follow the directions in the
      <ulink url="help:user-guide?feedback-bugs" type="help">Feedback section of the GNOME User Guide</ulink>.
    </para>
    <para>
      This program is distributed under the terms of the GNU
      General Public license as published by the Free Software
      Foundation; either version 2 of the License, or (at your option)
      any later version. A 
      <ulink url="help:gpl" type="help">copy of this license</ulink>
      is included with this documentation; another can be found in the file
      COPYING included with the source code of this program.
    </para>
  </sect1>
</article>
