Blowfish is a 64-bit block cipher designed by renowned cryptography expert Bruce Schneier. It is designed to operate efficiently on 32bit architectures and accepts variable key lengths. In practice initializing the cipher is a slow operation but once initialized the cipher operates very quickly.

The blowfish crypto algorithm has a homepage at [http://www.counterpane.com/blowfish.html].

Blowfish can be considered obsolete, it is succeeded by [Twofish].

A pure-Tcl implementation is included as part of [tcllib] (the original is on this wiki at [Blowfish in Tcl]; it supports encrypting/decrypting multiple streams in parallel, whereas the version in tcllib only handles one stream at a time).

Other Tcl packages with blowfish implementations are:

   * [Trfcrypt]
   * [Critlib] [http://www.equi4.com/critlib/]

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See also [BOOK: Applied Cryptography]

[[[Category Cryptography]]]