SHA-2 is a family of cryptographic hash functions designed by the United States National Security Agency and first published in 2001. It comprises six variants, including SHA-224, SHA-256, SHA-384 and SHA-512, producing fixed-size digests of 224 to 512 bits from any input. SHA-2 is built into major security protocols such as TLS, SSL, SSH and IPsec, and is used to authenticate Debian software packages, secure Bitcoin transactions, and protect password hashes in Linux systems. As of 2024 it remains secure against all known practical attacks, including those anticipated from quantum computers. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
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