SHA-2 (Secure Hash Algorithm 2) is a set of cryptographic hash functions designed by the United States National Security Agency (NSA). It is a successor to SHA-1, and includes several variants such as SHA-224, SHA-256, SHA-384, and SHA-512. These functions are commonly used to verify data integrity by producing a unique, fixed-size 'fingerprint' (hash) of a message or file. Any change to the original data, no matter how small, will result in a completely different hash value. SHA-2 is widely employed in security protocols like TLS/SSL, digital signatures, password storage, and blockchain technology.
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