SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function that generates a 160-bit (20-byte) hash value, typically rendered as a 40-character hexadecimal number. It takes an input message and produces a fixed-size output hash, commonly used for data integrity verification, digital signatures, and other security-related applications. However, due to vulnerabilities found in the algorithm, such as collision attacks, its security is no longer considered sufficient for high-stakes applications. As a result, the use of SHA-1 has been deprecated in favor of more secure hash functions like SHA-256 and SHA-3.
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