[Q] : verify an encrypted signed file.

[Florian Weimer]

Johan Wevers <johanw@vulcan.xs4all.nl> writes:

> Werner Koch wrote:
>
>> The next revision of OpenPGP has a countermeasure against that.  This
>> new mode is already used by GnuPG and PGP 7 if you are using
>> AES/RIJNDAEL or Twofish (i.e the recipient hast this algorithm in his
>> preferences).
>
> Is there a special reason whey this is only implemented for these
> algorithms, or did you just not yet have the time to implement it
> for the other algorithms?

The MDC packets are activated by certain symmetric algorithm
preferences (those with a block size greater than 8 octets).  Perhaps
the next OpenPGP version will provide additional flags to signal to
the sender that the receiver can deal with MDC packets even with other
symmetric algorithms.