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Gives a description of all of the machines used or developed at Bletchley Park for use in cryptanalysis. 

Cryptanalysis and Frequency Analysis

Now that the NSA has declassified this information about cryptanalysis, either they can no longer utilize these methods of cryptography, or must do so with caution, knowing that anyone has the resources to crack them. Was it ethical of the NSA to release this information, especially if other countries still use these methods to create ciphers?

Britain's code-breakers acknowledged Friday that an encrypted handwritten message from World War II, found on the leg of a long-dead carrier pigeon in a household chimney in southern England, has thwarted all their efforts to decode it since it was sent to them last month.