The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 01, 1999
Filed:
Feb. 14, 1997
Matthew A Blaze, New York, NY (US);
AT&T Corp., Middletown, NJ (US);
Abstract
A pseudo-random bit generator using at least one N-round Feistel construction that uses random functions. A block of data is permuted and divided into a stream word and a modification word. The stream word is used to build the pseudo-random bitstream. The modification word is used to modify a selected element of a random function used in a Feistel construction. When a single Feistel construction is used, its random functions are dynamically changed by the modification words as they are generated. When a plurality of Feistel constructions are used, the random functions of a selected inactive construction are modified by modification words generated by an active construction. When all of the elements of all of the functions of the inactive construction have been modified, the active and inactive functions are exchanged.