SecEx MD5+ Digest 1.1 (Windows)
From the developer: ""This free secure hash signature utility allows you to create and verify MD5, SHA-1 and RIPE-MD 160 message digests on one or multiple files. SecExMD5+ features a graphical wizard style interface, full integration with Windows explorer right-click menus, multiple file processing, and one-click email support for MAPI based email clients for easy distribution of digital signatures via email. ""The Secure Hash Algorithm 1 ( SHA1 ) has been officially adopted by the United States government as the Secure Hash Standard of the Federal Information Processing Standard ( FIPS ) and is specified in RFC 3174; RIPEMD-160 is a cryptographic hash function designed in the framework of the European Union's RACE Integrity Primitives Evaluation (RIPE) project; the MD5 message digest algorithm specifies a standard for producing a unique 128 bit fingerprint or digital signature for documents of arbitrary length. MD5 was designed by Professor Ronald L. Rivest of MIT and if specified in RFC 1321.""