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:
Aug. 15, 1995
Filed:
Mar. 11, 1994
Hiroshi Miyano, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A plaintext is enciphered using a plurality of stages in tandem via a plurality of iterations. Each of the stages is arranged to perform a complex key-dependent computation. The stage includes a memory for storing a key. A cipher function circuit transposes, using the key, one block applied to the stage from a preceding stage. An exclusive-or circuit implements an exclusive-or operation of the output of the cipher function and the other block applied to the stage from the preceding stage. A unique arrangement is provided for transposing the output of the cipher function circuit and then applying the output thereof to the memory. Therefore, the key is replaced with the output of the unique arrangement.