Knowing Something's Encrypted

[Jeff A Licquia]

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
jalicqui at prairienet.org          |   Me?  Speak for whom?  You've got
licquia at cei.com (work)           |     to be kidding!