Heraclitus : a LFSR-based stream cipher with key dependent structure
Colbert, Bernard, Dekker, Anthony H. and Batten, Lynn Margaret 2011, Heraclitus : a LFSR-based stream cipher with key dependent structure, in ICCSP 2011 - International Conference on Communications and Signal Processing, IEEE, Piscataway, N.J., pp. 141-145.
We describe Heraclitus as an example of a stream cipher that uses a 128 bit index string to specify the structure of each instance in real time: each instance of Heraclitus will be a stream cipher based on mutually clocked shift registers. Ciphers with key-dependent structures have been investigated and are generally based on Feistel networks. Heraclitus, however, is based on mutually clocked shift registers. Ciphers of this type have been extensively analysed, and published attacks on them will be infeasible against any instance of Heraclitus. The speed and security of Heraclitus makes it suitable as a session cipher, that is, an instance is generated at key exchange and used for one session.
Field of Research
080202 Applied Discrete Mathematics
Socio Economic Objective
890105 Satellite Communication Networks and Services