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:
Jan. 07, 2003
Filed:
Feb. 25, 1997
Applicant:
Inventor:
Masahiko Enari, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L 9/06 ;
U.S. Cl.
CPC ...
H04L 9/06 ;
Abstract
In a scrambler used in the transmission side, a decryptor for generating a work key from a data key and system keys uses the same decryption algorithm as that used in a decryptor for encryption in the OFB mode. Under this condition, in a descrambler used in the receiving side, a decryptor for generating a work key from a data key and system keys can use the same decryption algorithm as that used in a decryptor for encryption in the OFB mode. In addition, another decryptor can use the same decryption algorithm. Therefore, one decryptor can serve as these three decryptors. The scale of the descrambler configuration can be reduced.