Wed Jun 19 11:29:01 2002
On Wed, 19 Jun 2002 10:41:59 +0200, Malte Gell said:
> Hi there,
> "modification detection code", sounds interesting, can you tell us more about
> that ? Would be nice if you could enlighten us a bit ;-)
See the latest OpenPGP draft (draft-ietf-openpgp-rfc2440bis-05.txt).
> The man page says mdc is used for ciphers with block sizes >64 bit, so it's
> automatically used with AES,Twofish, does it make sense to force the use of
This behaviour is actually not defined as the OpenPGP WG decided that
we are going to use a special key flag for this (similiar to
preferences). gpg 1.0.7 has full support for this key flag and
generates new keys with it set. However there are only a few keys out
with support for that key, so we use a kludge to always use the MDC
feature for cipher algorithms using a blocksize different from 64 bits
which happens to be AES and Twofish.
> mdc with --force-mdc when using 3DES or CAST5 or is mdc best used with the
> new ciphers ?
No, DON'T DO THAT! Older versions of GnuPG and most PGP versions
won't be able to decrypt this message.