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SHA-256

A cryptographic hash function that generates a 256-bit (32-byte) signature, part of the SHA-2 family.

AbbreviationSHA-256
Categorysecurity

Overview

SHA-256 (Secure Hash Algorithm 256-bit) is one of the most popular and secure hash functions available today. It was designed by the NSA and is a key component of many security protocols and technologies, including Bitcoin.

Security

Unlike MD5, SHA-256 is currently considered resistant to collision attacks. The number of possible hash values is so large ($2^{256}$) that it is mathematically impossible to find a collision using current technology.

Applications

  • Blockchain: Used to link blocks together and secure transactions.
  • TLS/SSL: Used in the handshake process to verify data integrity.
  • Software Distribution: Used to provide secure checksums for downloads.

Related Terms

Cryptographic Hash FunctionMD5Blockchain Security