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:
Apr. 18, 2000
Filed:
Dec. 30, 1997
Shinichi Tsuchida, Kanagawa, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
An encryption unit uses part of a pseudo random number generated by a random number generator to encrypt data to be transferred which are stored in the payload of a cell. A counter information assigning section inserts counter information indicating the order in which the cell was sent into that payload. A random number generator on a receiving side generates the same pseudo random number as the random number generator on a sending side. A counter information analysis section identifies the position of the part of the pseudo random number to be used in the encryption unit based on the counter information extracted from the received cell, and has the random number generator on the receiving side output that part of the pseudo random number. The encrypted transferred data are extracted from the received cell, and these transferred data are decrypted using the part of the pseudo random number output from the random number generator on the receiving side.