High Quality Content by WIKIPEDIA articles! The U-229 is a cable connector currently (as of 2009[update]) used by the U.S. military for audio connections to field radios, typically for connecting a handset. There are five-pin and six-pin versions. This type of connector is also used by the National Security Agency to load cryptographic keys into encryption equipment from a fill device. In cryptography, a key is a piece of information (a parameter) that determines the functional output of a cryptographic algorithm or cipher. Without a key, the algorithm would have no result. In encryption, a key specifies the particular transformation of plaintext into ciphertext, or vice versa during decryption. Keys are also used in other cryptographic algorithms, such as digital signature schemes and message authentication codes.

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