When encrypting to a signed key using PGP Command Line on Red Hat Enterprise Linux and Cent OS the following warning may be displayed:
encrypt (3064:key invalid)
Applies To
Red Hat Enterprise Linux 5.9, 6.0 (x64) with PGP Command Line 10.2.0, 10.2.1, and 10.3.0
Cent OS version 5.9, 6.0, and 6.3 (x64) with PGP Command Line version 10.2.0 ,10.2.1, 10.3.0