TIMTOWTDI
Yes, there is more than one way. Many of the ways are booby trapped, though. It's best to be somewhat less offhand about proposing new cryptographic protocols.

if you are worried about plaintext attacks, gzip the plain text to turn it to binary first.
Binary data is still plaintext to a cryptographer. Gzipping can reduce some redundancies in the plaintext, but it also introduces its own structure.

In reply to Re^4: Is this a secure way to prevent cookie tampering by Anonymous Monk
in thread Is this a secure way to prevent cookie tampering by EvdB

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