Burn Notice Season 04 Episode 09 "Center of the Storm" was first aired last August 5, 2010 and below are the spy tips and tactics:
* Classified data has been digitally encoded since before computers were invented. Spies have used book ciphers for centuries to send numeric correspondence that only can be read when paired with the proper text. Bibles make good codebooks because of the variance between printed editions and the numbering of chapter and verse.