To date, there has only been one person to crack the code included in the back pages of Sword of Damocles (congratulations, Nancy). Here's a hint for those of you out there who are currently working on it.
The type of cipher used in Codebreakers is named after a general, statesman, Consul who was born in 100 BC. He died on March 15, 44 BC.
Good luck. And remember, the first five to break the code win an autographed paperback copy of Sword of Damocles.