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(1,2) You could use: gpg2 --s2k-mode 3 --s2k-count 65011712 --s2k-digest-algo SHA512 --s2k-cipher-algo AES256 --symmetric /*file path* According to The GNU Privacy Guard Manual, p. 71, we use --s2k-cipher-algo name when we want to apply symmetric encryption with a passphrase if --cipher-algo name or --personal-cipher-preferences string have not been set. ...


I) There is no minimum. Maximum in your case is $2^{64} * 16$ bytes with same key. II) No. No. GnuPG takes care of that. III) No. Compressing does not weaken encryption. IV) I don't think it matters because it is not authenticated encryption. V) Yes, passphrases must be different. VI) In your case you can get maximally 256-bits of security per cipher. ...

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