1796 SHA256 File Text (Structured) SHA256 is part of the family of SHA-2 (Secure Hash Algorithm 2) hash functions which are designed by the United States National Security Agency. SHA256 prodcues a 256-but (32-byte) hash value. It can be used as a checksum to verify data integrity. The SHA256 file is a text document which contains single or multiple SHA1 values. 1 Digital Preservation Department / The National Archives 15 Feb 2017 15 Feb 2017 fmt/991 PUID sha256 File extension