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I know it uses RSA/DSA to create keys, but does it use that same algorithm for the actual cipher?

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According to How PGP Works it uses a hybrid approach that generates a secret key for symmetric encryption. The wikipedia page for GPG then indicates that CAST5, Camellia, Triple DES, AES, Blowfish, and Twofish are the supported ciphers.

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I wouldn't point to pgpi.org. It's over a decade out of date and not maintained. But great answer. -- Jon –  Jon Callas Jun 19 '12 at 21:59
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