Method for improving a random number generator to make it...

Details Method for improving a random number generator to make it... Method for improving a random number generator to make it...

2006-12-05

2006-12-05

Barrón, Jr., Gilberto (Department: 2134)

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

C380S028000, C713S194000

Reexamination Certificate

active

07146006

ABSTRACT:
Two methods for random number generation are modified to make them more resistant to attacks by current measurements. The methods are particularly designed to be implemented in electronic devices such as smart cards, PCMCIA, badges, contactless cards or any other portable device. The DES algorithm is encrypted using a key K having a value D representing date information, to generate an integer variable I. For j ranging from 1 to m, the following steps are carried out: substituting s with s XOR I; introducing in the integer variable y the result of the encryption of s with the DES algorithm using the key K; introducing in xjthe result of y or s; substituting s with y XOR I; and introducing in s the result of the encryption of s with the DES algorithm using the key K. The sequence (x1, x2, xm) is then restored in the output.

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