Conventional Encryption interoperability

[Johan Wevers]

You, Daniel Chabrol, wrote:

> if I encrypt messages with CAST5 (GnuPG 1.0.2) I can't decrypt it with
> either PGP2.6.3i

Of course not: pgp 2.x versions only use IDEA for conventional encryption.

> or 6.5.1i.

That's worse. I tested this with pgp 2.6.3i and gpg 1.0.2: a file that is
conventional encrypted by pgp 2.6.3i can be decrypted with gpg if you put
the following in the options file:

compress-algo 2
cipher-algo IDEA
digest-algo MD5
s2k-cipher-algo IDEA
s2k-digest-algo MD5
rfc1991
allow-non-selfsigned-uid

I did not find a method for the other way arround: a file that is
conventionally encrypted with gpg 1.0.2 with this options always
gives a bad passphrase error in pgp 2.6.3i.

What I also notice is that with these options gpg seems not to compress
the output file. Is compress-algo 2 obly usable for decryption?

-- 
ir. J.C.A. Wevers         //  Physics and science fiction site:
johanw@vulcan.xs4all.nl   //  http://www.xs4all.nl/~johanw/index.html
PGP/GPG public keys at http://www.xs4all.nl/~johanw/pgpkeys.html

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