摘要:
A data encryption method performed with ring arithmetic operations using a residue number multiplication process wherein a first conversion to a first basis is done using a mixed radix system and a second conversion to a second basis is done using a mixed radix system. In some embodiments, a modulus C is be chosen of the form 2w−L, wherein C is a w-bit number and L is a low Hamming weight odd integer less than 2(w−1)/2. And in some of those embodiments, the residue mod C is calculated via several steps. P is split into 2 w-bit words H1 and L1. S1 is calculated as equal to L1+(H12x1)+(H12x2)+ . . . +(H12xk)+H1. S1 is split into two w-bit words H2 and L2. S2 is computed as being equal to L2+(H22x1)+(H22x2)+ . . . +(H22xk)+H2. S3 is computed as being equal to S2+(2x1+ . . . +2xk+1). And the residue is determined by comparing S3 to 2w. If S3
摘要:
A method and system for generating a cryptographically random number stream (100) is provided. A system includes a module (102) configured to provide at least two statistically random number streams (106) and (108) and an oscillator (104) operably coupled to the module (102). The oscillator (104) is configured to operate at a frequency which varies in response to physically unpredictable events and to select a current number from one of the at least two statistically random number streams (106) and (108) based on the oscillator's state. A process includes several steps. At least two statistically random number streams are provided (138). A current number is selected (140) from one of the at least two statistically random number streams based on the state of an oscillator operating at a frequency which varies in response to physically unpredictable events. The step of selecting (140) is repeated (142) to create the cryptographically random number stream. The number streams can be carried by signals (132), (134), and (136). An apparatus for performing the process is also disclosed.