Hi,

I'm encountering problems decrypting messages with compression algo 0.
The client producing the encrypted messages doesn't support any "other"
compression.
The problem is, that I get the error, that the used compression algorithm is
unknown to GnuPG 1.4.18.

I found a similar bug report for GnuPG 2:
T1326
Maybe this helps fixing the issue also in the 1.x branch.

gpg --list-packets message.txt.asc
:pubkey enc packet: version 3, algo 16, keyid xxxxxxxxxxxxxxxx

        data: [4096 bits]
        data: [4096 bits]

Sie benötigen eine Passphrase, um den geheimen Schlüssel zu entsperren.
Benutzer: "xxxxxxxxxxxxxxxxxxxxxxxxx"
4096-Bit ELG-E Schlüssel, ID xxxxxxxx, erzeugt xxxx-xx-xx (Hauptschlüssel-ID
xxxxxxxx)

:pubkey enc packet: version 3, algo 1, keyid xxxxxxxxxxxxxxxx

data: [2047 bits]

:pubkey enc packet: version 3, algo 1, keyid xxxxxxxxxxxxxxxx

data: [2046 bits]

:encrypted data packet:

length: 55
mdc_method: 2

gpg: verschlüsselt mit 2048-Bit RSA Schlüssel, ID xxxxxxxx, erzeugt xxxx-xx-xx

"xxxxxxxxxxxxxxxxxxxx"

gpg: verschlüsselt mit 2048-Bit RSA Schlüssel, ID xxxxxxxx, erzeugt xxxx-xx-xx

"xxxxxxxxxxxxxxxxxxxx"

gpg: verschlüsselt mit 4096-Bit ELG-E Schlüssel, ID xxxxxxxx, erzeugt xxxx-xx-xx

"xxxxxxxxxxxxxxxxxxxx"

:compressed packet: algo=0
gpg: uncompressing failed: Unbekanntes Komprimierverfahren