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Comment Re:Mathematically impossible (Score 1) 868

There is a confusion of purpose here.

The OTP is an encryption scheme, not a full protocol. A full protocol would also contain a message authentication system. Not that this
is easy or obvious - the very recent pgp/gpg flaw was due to an attack somewhat like what you suggest. The proper fix to that flaw was to add a message authentication step to the protocol.

As other poeple pointed out - several encryption scheme (e.g. some stream cyphers) - use (Message) XOR (pseudo-random pad) and have the same plaintext issue.

As an encryption scheme, the OTP is optimal.

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