+ <term><option>size=</option></term>
+
+ <listitem><para>Specifies the key size
+ in bits. See
+ <citerefentry><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ for possible values and the default value of
+ this option.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>swap</option></term>
+
+ <listitem><para>The encrypted block device will
+ be used as a swap device, and will be formatted
+ accordingly after setting up the encrypted
+ block device, with
+ <citerefentry project='man-pages'><refentrytitle>mkswap</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+ This option implies <option>plain</option>.</para>
+
+ <para>WARNING: Using the <option>swap</option>
+ option will destroy the contents of the named
+ partition during every boot, so make sure the
+ underlying block device is specified correctly.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>tcrypt</option></term>
+
+ <listitem><para>Use TrueCrypt encryption mode.
+ When this mode is used, the following options are
+ ignored since they are provided by the TrueCrypt
+ header on the device or do not apply:
+ <option>cipher=</option>,
+ <option>hash=</option>,
+ <option>keyfile-offset=</option>,
+ <option>keyfile-size=</option>,
+ <option>size=</option>.</para>
+
+ <para>When this mode is used, the passphrase is
+ read from the key file given in the third field.
+ Only the first line of this file is read,
+ excluding the new line character.</para>
+
+ <para>Note that the TrueCrypt format uses both
+ passphrase and key files to derive a password
+ for the volume. Therefore, the passphrase and
+ all key files need to be provided. Use
+ <option>tcrypt-keyfile=</option> to provide
+ the absolute path to all key files. When using
+ an empty passphrase in combination with one or
+ more key files, use <literal>/dev/null</literal>
+ as the password file in the third field.</para></listitem>