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

Claim 9:
10. The decryption device according to claim 7,
wherein the processing circuitry, for each integer i of i=m+1 and i=m+2 in an ascending order, takes a value S1(i−1) as input to the encryption function E, thereby calculating a value S1(i), and for an integer i including at least m+1 between i=m+1 and i=m+2, calculates an exclusive OR of r bits out of the value S1(i) and the value S2(i−1), thereby calculating the value S2(i), and bit-couples a value S1(m+2) and a value S2(m+1) or a value S2(m+2), thereby generating the authenticator T.