[seahorse/wip/userdocs: 13/423] Added a list of basic terms in introduction.page

[Ekaterina Gerasimova <egerasimov src gnome org>]

commit c489ba11650d7f982a0d1a07c782198c745b467a
Author: Aruna Sankaranarayanan <arunasank src gnome org>
Date:   Fri Jun 14 00:00:06 2013 +0530

    Added a list of basic terms in introduction.page
    
    Explanation of some technical terms involved.

 help/C/introduction.page |   69 ++++++++++++++++++++++++++++++++++++++++-----
 1 files changed, 61 insertions(+), 8 deletions(-)
---
diff --git a/help/C/introduction.page b/help/C/introduction.page
index 115353c..67d1c3a 100644
--- a/help/C/introduction.page
+++ b/help/C/introduction.page
@@ -2,15 +2,68 @@
       type="topic" style="task"
       id="introduction">
 
-<info>
-  <link type="guide" xref="index"/>
-  <revision pkgversion="3.8" date="2013-02-26" status="stub"/>
-  <credit type="author">
-    <name>Jim Campbell</name>
-    <email>jwcampbell gmail com</email>
-  </credit>
-</info>
+  <info>
+    <link type="guide" xref="index"/>
+  
+    <revision pkgversion="3.8" date="2013-02-26" status="stub"/>
+    <revision pkgversion="3.9" date="2013-06-13" status="draft"/>
+
+    <!--get written consent from Jim before adding this or changing the
+    legal.xml file
+    <include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"/>-->
+  
+    <credit type="author">
+      <name>Jim Campbell</name>
+      <email>jwcampbell gmail com</email>
+    </credit>
+  
+    <credit type="author copyright">
+      <name>Aruna Sankaranarayanan</name>
+      <email>aruna evam gmail com</email>
+      <years>2013</years>
+    </credit>
+  </info>
 
   <title>Introduction</title>
 
+  <p><app>Passwords and Keys</app> helps you to communicate securely over the
+  Internet and keep your files and data safe. It provides extremely advanced
+  mathematical methods and highly secret keys to protect your files and
+  communication. Some basic terms that you may encounter while reading this
+  help are:</p>
+
+  <terms>
+    <item>
+      <title>Encryption</title>
+       <p>Encryption is the process of making your important files and data
+       unreadable to anyone but the intended recipient. It is done by the
+       sender.</p>
+    </item>
+    <item>
+      <title>Decryption</title>
+       <p>Decryption is the process of retrieving the original text from the
+       encrypted message or file. It is done by the receiver.</p>
+    </item>
+    <item>
+      <title>Plaintext</title>
+       <p>Any data or file that is readable by a recipient or a
+       non-recipient.</p>
+    </item>
+    <item>
+      <title>Key</title>
+       <p>A key is used to encrypt or decrypt your data. For example, if you
+       wish to encrypt your personal messages by substituting every letter in
+       the message with a new letter according to some substitution set you
+       have, the substitution set would be a key because anyone who has the
+       substitution set can decrypt your messages. <app>Passwords and
+       Keys</app> uses highly complex and advanced mathematical means to
+       generate a key so that it is not guessable. Keys can be
+       <link xref="what-diff-private-public">private or public</link>.</p>
+    </item>
+    <item>
+      <title>Keyring</title>
+       <p>A keyring is a collection of all your encryption keys.</p>
+    </item>
+  </terms>
+
 </page>