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SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function designed to produce a fixed-size 160-bit hash value, often represented as a 40-character hexadecimal number. Developed by the National Security Agency (NSA) in collaboration with the National Institute of Standards and Technology (NIST), SHA-1 was published in 1993 as a revision of its predecessor, SHA-0. SHA-1 is now considered deprecated and not recommended for use in security-critical applications.

Details about the specification can be found in IETF RFC 3174 https://datatracker.ietf.org/doc/rfc3174/.

This online tool allows you to use the SHA-1 Hash.