公开(公告)号：MY147708A

公开(公告)日：2013-01-15

申请号：MYPI20093553

申请日：2009-08-26

Applicant: MIMOS BERHAD

Inventor： AZIZ RAJA MOHD FAUD BIN TENGKU ,  OTHMAN MASURI PROF DR ,  BEG AHMAD RAIF BIN MOHAMED NOOR ,  SAEB MAGDY DR

IPC: H04L9/06

Abstract: A METHOD OF ENCRYPTING (10) A PLAINTEXT WITH ENHANCED SECURITY IN CRYPTOGRAPHY OPERATION, COMPRISES STEPS OF RECEIVING THE PLAINTEXT TO BE ENCRYPTED, GENERATING AN INITIAL ROUND (11) BY PERFORMING ADDROUNDKEY FUNCTION (14) WITH A FIRST KEY EXPANSION (15), GENERATING SUBSEQUENT ROUNDS (26) BASED ON THE OUTPUT FROM GENERATED INITIAL ROUND (11) BY PERFORMING BYTESUB (18), SHIFTROW (19), MIXCOLUMN (20) AND ADDROUNDKEY (23) FUNCTIONS, WHEREIN THE ADDROUNDKEY FUNCTION (23) IS PERFORMED USING A FIRST KEY SCHEDULE (25), AND GENERATING A FINAL ROUND (27) BY PERFORMING BYTESUB (28), SHIFTROW (29) AND ADDROUNDKEY (32) FUNCTIONS WHEREIN THE ADDROUNDKEY FUNCTION (32) IS PERFORMED USING THE FIRST KEY EXPANSION (15) TO TRANSFORM THE PLAINTEXT TO CIPHERTEXT. A BOOLEAN AND ROTATION FUNCTION (12, 21, 30) FOLLOWED BY AN ADDITIONAL ADDROUNDKEY FUNCTION (13, 22, 31) WHICH ARE KEY-BASED ARE PERFORMED BEFORE THE ADDROUNDKEY FUNCTION (14, 23, 32) IN EACH ROUNDING STAGE.