Decrypt an encrypted mail with detached signature?! ?

Holger Sesterhenn
Fri Jul 25 16:17:02 2003


I have received a mail which is encrypted by a CryptEx OpenPGP client.

Using 'gpg --decrypt mail.asc' I see this output:
user@compi:~/tmp/> gpg --status-fd 2 --decrypt mail.asc
[GNUPG:] ENC_TO 1111111111111111 16 0
[GNUPG:] ENC_TO 2222222222222222 16 0
gpg: encrypted with 2048-bit ELG-E key, ID 11111111, created 2011-11-11
gpg: encrypted with 2048-bit ELG-E key, ID 22222222, created 2003-05-07
Testmessage signed and encrypted with PGP
Detached signature.
Please enter name of data file:
This mail is encrypted to me and the senders key (11111). The text of the
mail is just "Testmessage signed and encrypted with PGP"

It is a simple PGP/INLINE mail, no attachment, no additional data file:

Version: CryptoEx OpenPGP Engine Version 2.1
Comment: CryptoEx Client Suite -


I have tried to see more with --verbose --verbose --verbose but I could not
find a hint that this mail has a deteched signature. Which signature type
from RFC2440 does mark a detached signature? Type 0x00???

PGPDUMP does not help because it as an encrypted mail :)

I have then imported my key into PGP 8.0 for Windows and


it does decrypt and verify the message without any error message.

Whats going on?

Best Regards,
Utimaco Safeware AG

Holger Sesterhenn
Development Engineer Security Gateway
Tel.:       +49 (0) 241 1696-200
Fax.:       +49 (0) 241 1696-199