On Fri, Mar 11, 2011 at 12:50:26PM -0500, Avi wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA512 > > Forgive my ignorance, but is there a way to take a given > encrypted message/file and determine which compression algorithm > was used (and which level)? I know how to set compression > algorithm and level prefs, but I'm curious to see what others > use, if possible.
If the file has been encrypted to you (or, more specifically, to one of the secret keys currently accessible to you), then, yes, you most probably can - "gpg --list-packets filename" should tell you what compression algorithm has been used, then it's just a matter of looking it up in RFC 4880 :) If the message has been encrypted to someone else's key, then you most probably won't be able to examine it - at least GnuPG does the compression before the encryption, so that the information about the compression algorithm used is contained within the encrypted data. You may still give it a shot with --list-packets, but don't expect too much :) Hope that helps. G'luck, Peter -- Peter Pentchev r...@ringlet.net r...@freebsd.org pe...@packetscale.com PGP key: http://people.FreeBSD.org/~roam/roam.key.asc Key fingerprint FDBA FD79 C26F 3C51 C95E DF9E ED18 B68D 1619 4553 This sentence contains exactly threee erors.
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