Description: Secure Hash Algorithm (Secure Hash Algorithm) is mainly applied to the Digital Signature Standard (Digital Signature Standard DSS) which defines the Digital Signature Algorithm (Digital Signature Algorithm DSA). For the message length is less than 2 ^ 64 s, SHA1 produces a 160-bit message digest. When a message is received when the message digest can be used to verify the integrity of the data. During the transmission, the data is likely to change, then this time it will have a different message digest. SHA1 has the following features: You can not recover information the message digest two different messages do not produce the same message digest.
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