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Knowing Something's Encrypted
Maybe I'm missing something here. If I am, please bonk me.
Here's a simple method for knowing that some data you received is encrypted:
1. Require a specific method (we'll use PGP in this example).
2. When a message comes in, check for a PGP format message. If you
really wanted to get fancy, you could parse the PGP header a bit to make
sure the data was really encrypted.
It's true that this isn't "cryptographic" in the sense of testing the
ciphertext itself, but it should work for the practical goal of enforcing
a "must be encrypted" rule.
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Jeff Licquia (lame .sig, huh?) | Finger for PGP 2.6 public key
[email protected] | Me? Speak for whom? You've got
[email protected] (work) | to be kidding!