24/06/2005 - Controller General of Patents, Designs, and Trade Marks

(21) Application No.02/DEL/2000 A (22) Date of filing of Application:03/01/2000
(54) Title of the invention: “DATA ENCRYPTION APPARATUS AND METHOD.”
(51) International Classification 7 :
H04L 9/08
(30) Priority Data:
(31) Document No.:11-146079
(32) Date :26/05/1999
(33) Name of convention country
:JAPAN
(66) Filed U/s 5(2) : NIL
(61) Patent of addition to application
No. : NA
(62) Filed on : NA
(63) Divisional to Application No.
:NIL
(64) Filed on : NA
(57) Abstract:
(71) Name of the applicant:
MATSUSHITA ELECTRIC INDUSTRIAL CO.
LTD.,
Address of the Applicant:
1006, Oaza Kadoma, Kadoma-shi, Osaka 571-8501,
Japan.
(72) Name of the Inventor:
YOKOTA KAORU
OHMORI MOTOJI
MIYAJI ATSUJKO.
A data converting unit includes a key adding unit for performing an arithmetic addition
modulo2 32 for input data F and subkey data Ki and outputting the outcome as data G, and a data
substituting unit for performing an exclusive-OR operation for corresponding bits in data Rot 7
(G) obtained by shift-rotating the data G by 7 bits toward higher-order bit positions, data Rot 1
(G)obtained by shift – rotating the data G by 1 bit toward higher order bit positions, and the data
G itself.
18099