Patent Number: 6,490,357

Title: Method and apparatus for generating encryption stream ciphers

Abstract: A method and an apparatus for generating encryption stream ciphers are based on a recurrence relation designed to operate over finite fields larger than GF(2). A non-linear output can be obtained by using one or a combination of non-linear processes to form an output function. The recurrence relation and the output function can be selected to have distinct pair distances such that, as the shift register is shifted, no identical pair of elements of the shift register are used twice in either the recurrence relation or the output function. Under these conditions, the recurrence relation and the output function also can be chosen to optimize cryptographic security or computational efficiency.

Inventors: Rose; Gregory G. (Mortlake, AU)

Assignee: Qualcomm Incorporated

International Classification: H04L 9/18 (20060101); H04L 9/26 (20060101); H04L 009/22 ()

Expiration Date: 12/03/2019