Abstract: In order to have a completely secure cryptographic system, it has been looked for a system unconditionally secure as the One Time Pad, but without its key distribution problem. It is herein disclosed a cryptographic system, which implements a cryptographic process based on a random sequence generating process (1), generating a random key as long as the data to process, for a ciphering process (2) or a deciphering process (3). The random sequences generated by the random sequence generating process (1), being perfectly random, are perfectly reproducible for those who have the correct random-transfer maps (4) and seeds (5). Therefore, we have a very strong cryptographic system without the problem of the key distribution. It even allows to implement an unconditionally secure communication channel over a network. Such cryptographic system can be implemented on very different hardwares, even with limited computing power like smart cards.

Abstract: A cryptographic system implementing a cryptographic process based on a random sequence generating process (1) generating a random key, as long as the data to process, for a ciphering process (2) or a deciphering process (3). The random sequences generated by the random sequence generating process (1), being perfectly random, are perfectly reproducible for those who have the correct random-transfer maps (4) and seeds (5). Therefore, we have a very strong cryptographic system without the problem of the key distribution. It even allows to implement an unconditionally secure communication channel over a network. Such cryptographic system can be implemented on very different hardwares, even with limited computing power like smart cards.