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Security

Submission + - Convicted Terrorist Relied on Single Letter Cipher

Hugh Pickens writes writes: "The Register reports that the majority of the communications between convicted terrorist Rajib Karim and Bangladeshi Islamic activists were encrypted with a system which used Excel transposition tables which they invented themselves that used a single-letter substitution cipher invented by the ancient Greeks that had been used and described by Julius Caesar in 55BC. Despite urging by the Yemen-based al Qaida leader Anwar Al Anlaki, Karim rejected the use of a sophisticated code program called "Mujhaddin Secrets" which implements all the AES candidate cyphers, "because 'kaffirs', or non-believers, know about it so it must be less secure." "Tough communication interception laws [RIPA] were passed in the UK 10 years ago on the basis that they were needed to fight terrorism," says Duncan Campbell, who acted as an expert witness for the defense during the trial. "The level of cryptography they used was not even up to the standards of cryptology and cryptography in the Middle Ages, although they made it look pretty using Excel.""

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