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A key generator[1][2][3] is a protocol or algorithm that is used in many cryptographic protocols to generate a sequence with many pseudo-random characteristics. This sequence is used as an encryption key at one end of communication, and as a decryption key at the other. One can implement a key generator in a system that aims to generate, distribute, and authenticate[4] keys in a way that without the private key, one cannot access the information in the public end.[5]
Examples of key generators include linear-feedback shift registers (LFSR) and the Solitaire (or Pontifex) cipher.