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159 wiersze
4.6 KiB
159 wiersze
4.6 KiB
<chapter id="chiasmus">
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<chapterinfo>
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<authorgroup>
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<author>
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<firstname>Jan-Oliver</firstname>
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<surname>Wagner</surname>
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<affiliation><address>
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<email>jan@intevation.de</email>
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</address></affiliation>
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</author>
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<author>
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<firstname>Till</firstname>
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<surname>Adam</surname>
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<affiliation><address>
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<email>till@kdab.net</email>
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</address></affiliation>
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</author>
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</authorgroup>
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<date>2005-06-30</date>
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<releaseinfo>1.8</releaseinfo>
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</chapterinfo>
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<title>Using the Chiasmus encryption tool</title>
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<sect1 id="chiasmus-preparations">
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<title>Preparations</title>
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<para>
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To encrypt and decrypt with Chiasmus, you need the BSI's Chiasmus
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command line tool for GNU/Linux. It is intended solely for use in
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government agencies and availabe from the BSI on request.
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</para>
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<para>
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When executed without parameters, the <command>chiasmus</command>
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program should output something like:
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</para>
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<para>
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<screen>
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Chiasmus (R) fuer Windows K 1.8.0.0
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Bundesamt fuer Sicherheit in der Informationstechnik
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Kontakt: Chiasmus@bsi.bund.de
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(C) 2001 - 2005
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[ ...]
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</screen>
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</para>
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<para>
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Version 1.8.0.0 was tested succesfully. Other versions may or may not
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work correctly.
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</para>
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<para>
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As a last preparation step a directory which will hold the key files
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ending in <filename>.xis</filename> has to be created, if none already exists. Usually
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<filename class="directory">~/.chiasmus/</filename> is used.
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</para>
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</sect1>
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<sect1 id="chiasmus-configuration">
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<title>Configuration</title>
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<para>
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Select <menuchoice><guimenu>Settings</guimenu><guimenuitem>Configure KMail
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</guimenuitem></menuchoice> and choose the <guilabel>Crypto-Backends</guilabel>
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tab on the Security page. Select the entry for <guilabel>Chiasmus</guilabel> and click
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<guibutton>Configure....</guibutton> to open the configuration dialog
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for the Chiasmus backend.
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</para>
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<para>
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Specify the path to the Chiasmus binary and the directory where key files are
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to be stored, using the file selection dialogs which open when you click the
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folder icons next to the path entries.
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</para>
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<para>
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Close the backend configuration dialog by clicking <guibutton>Ok</guibutton>
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and check the <guilabel>Chiasmus Checkbox</guilabel> to activate it. Then also close the main
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configuration dialog.
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</para>
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</sect1>
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<sect1 id="chiasmus-encryption">
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<title>Encryption</title>
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<para>
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To encrypt a message with Chiasmus, select <menuchoice><guimenu>
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Options</guimenu><guimenuitem>Encrypt message with chiasmus
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</guimenuitem></menuchoice>. A dialog comes up in which you can select
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the key file to use, as well as additional command line arguments to
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be passed to <command>chiasmus</command>.
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</para>
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<note>
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<para>
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If you want to use Chiasmus encryption regularly, you should add
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an icon for that option to your toolbar, using <menuchoice><guimenu>
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Settings</guimenu><guimenuitem>Configure toolbars</guimenuitem>
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</menuchoice>. Move the entry for <guilabel>Encrypt with Chiasmus
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</guilabel> from the left side of the dialog to the right, using the
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buttons between the two panes. You can then quickly enable or disable
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Chiasmus encryption using that toolbar button and have a visual
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indication of the current state.
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</para>
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</note>
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<note>
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<para>
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If automatic saving of backup copies of currently edited messages is
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enabled, you will be prompted for your Chiasmus password, if Chiamsus
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encryption is active.
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</para>
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</note>
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<para>
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On message sending, you will be prompted for the password. If the password
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is correct, the text of the message and all its attachments will be
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encrypted.
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</para>
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<note>
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<para>
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The other signing and encryption options are completely independent of
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the Chiasmus encryption. You can use those in addition to Chiasmus,
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⪚ to sign the message. Additional encryption, on the other hand,
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does not make much sense and complicates decryption for the
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recipients.
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</para>
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</note>
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</sect1>
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<sect1 id="chiasmus-decryption">
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<title>Decryption</title>
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<para>
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&kmail; and &kontact; detect messages that have been encrypted
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using Chiasmus and will automatically ask for the key file to use for
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decryption, as well as the corresponding password. If the password is correct, the
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message will be decrypted and displayed.
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</para>
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<para>
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To decrypt attachments that were encrypted using Chiasmus (&ie; those which have
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a file name ending in <filename>.xia</filename>), right-click on the
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attachment you want to decrypt and select <menuchoice><guimenuitem>Decrypt using Chiasmus
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</guimenuitem></menuchoice>. After you have chosen a key file to be used for decryption and
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entered the correct password for it, a file selection dialog will allow you
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to specify where the decrypted attachment should be saved.
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</para>
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</sect1>
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</chapter>
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