SHA-1 (“Secure Hash Algorithm #1”, also “SHA1”) is the second most common data integrity check standard (a.k.a. “hash”) used throughout the world today. SHA-1 codes are 160-bit numbers and are usually represented in hexadecimal format (e.g., “de9f2c7f d25e1b3a fad3e85a 0bd17d9b 100db4b3”).
SHA-1 is the least secure hash algorithm NIST currently supports in its FIPS validated cryptography implementations. However, SHA-1 is faster than SHA-2 (its successor) and is commonly available in file transfer technology today (e.g., FTP’s unofficial “XSHA1” command).