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NIST Standard: The SHA Hash Algorithm series is a series of SHA hash algorithms developed by the National Institute of Standards and Technology (NIST), consisting mainly of SHA-1, SHA-2, and SHA-3 series. SHA-1 is no longer in use due to security issues. The SHA-2 series includes SHA-224 (which represents a hash length of 224 bits), SHA-256, SHA-384, SHA-512 and other algorithms, of which SHA-256 is currently the most widely used one-way hash. SHA-3 is the latest algorithm standard derived from the keccak algorithm participating in the SHA-3 competition. In 2015, NIST adjusted keccak's filling process when it completed the standardization of SHA-3, so the standard SHA-3 algorithm is not compatible with the original keccak algorithm. State-secret standard: State-secret hash algorithm SM3, is a one-way hash algorithm standard developed in China, issued by the National Password Administration on December 17, 2010, its security and efficiency is comparable to SHA-2 series SHA-256.