Rabbit is a synchronous stream cipher that was rst presented at the Fast
Software Encryption workshop in 2003
The algorithm and source code was released in 2008 as public domain software.
Rabbit was designed by Martin Boesgaard, Mette Vesterager, Thomas Pedersen, Jesper Christiansen and Ove Scavenius.
The authors of the cipher have provided a full set of cryptanalytic white papers on the Cryptico home page.[2] It is also described in RFC 4503