How can I encrypt a message in Perl to decrypt it in C#?

As Lars said, AES is probably the best choice these days. For a Perl implementation, see Crypt::Rijndael.

Use AES encryption with a common secret key. Perl C.

Sorry for unmarking your answer. Unfortunately I can't mark both of you with the correct answer - and Leon mentioned Crypt::Rijndael which helped. – David Christiansen Feb 23 '09 at 14:22.

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