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:
Mar. 07, 2000
Filed:
Dec. 10, 1997
Lothrop Mittenthal, Thousand Oaks, CA (US);
Allegheny Teledyne Inc., Pittsburg, PA (US);
Abstract
The present invention is an apparatus and method of encryption. A first table comprising a set of 2.sup.n distinct n-bit input numbers and a first set of 2.sup.n distinct n-bit output numbers is received. A second table comprising of the set of 2.sup.n distinct n-bit input numbers and a second set of 2.sup.n distinct n-bit output numbers is also received. The first and second sets of 2.sup.n n-bit output numbers are each a one-to-one mapping of the set of 2.sup.n n-bit input numbers, and the second mapping of 2.sup.n n-bit output numbers is disjoint from the first mapping of 2.sup.n n-bit output numbers. The first and the second tables are combined and a fourth table of 2.sup.n pairs of (n+1)-bit numbers is generated by converting each of the 2.sup.n pairs of n-bit input numbers and each of the 2.sup.n pairs of n-bit output numbers in the third table, to (n+1)-bit numbers. Clear text (n+1)-bit data is then encrypted by providing the (n+1)-bit clear text data as inputs to the fifth table to obtain cipher text (n+1)-bit numbers as outputs.