Hash - MDN Web Docs Glossary: Definitions of Web-related terms 编辑

The hash function takes a variable length message input and produces a fixed-length hash output. It is commonly in the form of a 128-bit "fingerprint" or "message digest". Hashes are very useful for cryptography — they insure the integrity of transmitted data. This provides the basis for HMAC's, which provide message authentication.

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• hash function on Wikipedia