1798 MD5 File Text (Structured) The MD5 algorithm is a hash function producing a 128-bit hash value, it is described in RFC 1321. Although MD5 was initially designed to be used as a cryptographic hash function, it has been found to suffer from extensive vulnerabilities. It can still be used as a checksum to verify data integrity against unintentional corruption. The MD5 file is a text document which contains single or multiple MD5 values. 1 Digital Preservation Department / The National Archives 15 Feb 2017 15 Feb 2017 fmt/993 PUID md5 File extension