CRYPTO 2008 T-Shirt Puzzle

This is the puzzle image on the T-shirt:

Your mission, should you choose to accept it is to:

1. Decrypt the last 32 characters
2. Provide the source of the plaintext of the rest of the puzzle.
3. Fill out the answer submission form you received at registration.
4. Drop off the form, on or before Tuesday, in the IACR submission basket
5. The deadline times are:
   1. Before 10:20 at conference registration.
   2. After 10:20 but before 18:45 at the Anacapa Hall desk.
6. Attend the Rump Session at the University Center Corwin Pavilion to see if you won.

If you need some help, there are a chain of hints...

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