Patent ID: 11876888
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. The encryption device according to claim 1,
wherein the processing circuitry
acquires open data A,
divides the open data A every b bits from a beginning, thereby generating b-bit values A1, . . . , Aa-1 and a value Aa having 1 or more bits to b or less bits, and

assigns a b-bit fixed value const1 to a value H1(0), and for each integer i of i=1, . . . , a in an ascending order, to take a value A′i obtained by calculating an exclusive OR of a value Ai and a value H1(i−1), as input to the encryption function E, thereby calculating a value H1(i), and to assign a value H1(a) to the value H1; and
assigns an r-bit fixed value const2 to a value H2(0), and for each integer i of i=1, . . . , a in an ascending order, to calculate a value H2(i) from the calculated value H1(i) and from a value H2(i−1), and to assign a value H2(a) to the value H2.