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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"
[
<!-- entities files to use -->
<!ENTITY % global_entities SYSTEM 'global.entities'>
%global_entities;
]>
<refentry id='amcrypt-ossl.8'>
<refmeta>
<refentrytitle>amcrypt-ossl</refentrytitle>
<manvolnum>8</manvolnum>
&rmi.source;
&rmi.version;
&rmi.manual.8;
</refmeta>
<refnamediv>
<refname>amcrypt-ossl</refname>
<refpurpose>crypt program for Amanda symmetric data encryption using OpenSSL</refpurpose>
</refnamediv>
<refentryinfo>
&author.ktill;
</refentryinfo>
<!-- body begins here -->
<refsynopsisdiv>
<cmdsynopsis>
<command>amcrypt-ossl</command>
<arg choice="opt">-d</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>DESCRIPTION</title>
<para>
&amcryptossl; uses <emphasis remap='B'>OpenSSL</emphasis> to encrypt
and decrypt data. OpenSSL is available from <ulink
url="http://www.openssl.org/">www.openssl.org</ulink>. OpenSSL
offers a wide variety of cipher choices (&amcryptossl; defaults to
256-bit AES) and can use hardware cryptographic accelerators on several
platforms.
</para>
<para>
&amcryptossl; will search for the OpenSSL program in the following
directories: /bin:/usr/bin:/usr/local/bin:/usr/ssl/bin:/usr/local/ssl/bin.
</para>
</refsect1>
<refsect1>
<title>PASSPHRASE MANAGEMENT</title>
<para>
&amcryptossl; uses the same pass phrase to encrypt and decrypt data.
It is very important to store and protect the pass phrase properly.
Encrypted backup data can <emphasis remap='B'>only</emphasis> be
recovered with the correct passphrase.
</para>
<para>
OpenSSL's key derivation routines use a salt to guard against
dictionary attacks on the pass phrase; still it is important to pick
a pass phrase that is hard to guess. The Diceware method (see <ulink
url="http://www.diceware.com/">www.diceware.com</ulink>) can be used to create passphrases
that are difficult to guess and easy to remember.
</para>
</refsect1>
<refsect1>
<title>FILES</title>
<variablelist remap='TP'>
<varlistentry>
<term>/var/lib/amanda/.am_passphrase</term>
<listitem>
<para>
File containing the pass phrase. It should not be readable by any user other than the Amanda user.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<seealso>
<manref name="amanda.conf" vol="5"/>,
<manref name="openssl" vol="1"/>,
<manref name="amcrypt-ossl-asym" vol="8"/>
</seealso>
</refentry>
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