For stream cryptography the pseudo random number generation device and the pseudo random number generation

摘要

As for this invention, as for T-function because it spreads to only higher rank from subordinate position of the data, giving finite difference to the data, finite difference is not spread to the subordinate bit from the bit position which gives finite difference, the stream code which utilizes T-function designates that the problem that is solved it is the possibility of being deciphered making use of finite difference as purpose. Non-linear conversion expedient 11 (T-function) with after renewing the data, displacement expedient (13) with it can add the processing which does bit displacement, it can expect the effect to which finite difference from the superior bit spreads to the subordinate bit with this, (Figure 1).