Happened to notice a minor incompatibility that was not there in previous versions of gnupg 1.x, before IDEA was included.
Created the following symmetrically encrypted message using Disastry's version of PGP 2.x -----BEGIN PGP MESSAGE----- Version: PGP 2.6.3ia-multi06 Comment: Passphrase: sss pgAAADPRnyFTsp5qCgKjgKpouoMqq1orcvEsZry5uRprNq9Qce3FqUzZT8BbeuGO Vah6crraHF4= =8GSP -----END PGP MESSAGE----- This was the command, using Twofish as the preferred cipher: V:zdm6dj32>pgp -ca -jt c:hct.txt TWOFISH chosen for conventional encryption. Pretty Good Privacy(tm) 2.6.3ia-multi06 - Public-key encryption for the masses (c) 1990-96 Philip Zimmermann, Phil's Pretty Good Software. 2002-04-22 International version - for use everywhere (including USA). Current time: 2014/03/12 13:42 GMT PGP is now using TWOFISH with MD5. You need a pass phrase to encrypt the file. Enter pass phrase: sss Output file 'c:hct.asc' already exists. Overwrite (y/N)? y Now, when trying to decrypt, this is what happens in GnuPG 1.4.16 : C:g1416>gpg -d c:hct.asc gpg: armor: BEGIN PGP MESSAGE gpg: armor header: Version: PGP 2.6.3ia-multi06 gpg: armor header: Comment: Passphrase: sss :encrypted data packet: length: 51 gpg: assuming IDEA encrypted data gpg: session key: `1:9F6E6800CFAE7749EB6C486619254B9C' gpg: out of memory while allocating 1746465999 bytes Is there something in the way that pgp 2.x makes symmetrical messages, that gnupg recognizes as 2.x, and therefore assumes IDEA ? (I did not use 'pgp 2' in the options in gpg.conf.) vedaal
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