Q, please use GPG or something similar!
>Yes, RSA signature would work if Q wants >to bother with it.
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>How it works:
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>Q generates public and private key.
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>Q distributes public key. Unfeasible to >crack even with supercomputer.
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>If a post is signed with public key, only >private key can decrypt.
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>If a post is signed with private key, only >public key can decrypt.
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>Thus, he encrypts his post with private >key and then you verify by decrypting >with his public. Only he can encrypt posts >with private key because he never >distributed it.
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>Complicated, but professional.