Before Jack Straw became UK roving arms salesman he was Jack the RIPa.
Operation Dear Jack
The Electronic Commerce Bill would make it a crime to fail to give up the decryption key to a message if a policeman thinks you've got it. If you haven't got it, it is up to you to prove you haven't. If you can't prove it, you would be liable for 2 years in jail.
STAND sent this letter to Jack Straw, Home Secretary, with an encrypted confession to a real crime in it. We also made it look as though Jack Straw had the decryption key. Here is our photostory: we'll be relying on these photos to try and convince the judge that we didn't keep a copy of the key; Jack will have to come up with another argument
FROM
http://www.stand.org.uk/dearjack/photostory.php3