ENCRYPTION SYSTEM, AUTHENTICATION SYSTEM, ENCRYPTION DEVICE, DECRYPTION DEVICE, AUTHENTICATOR GENERATION DEVICE, VERIFICATION DEVICE, ENCRYPTION METHOD, AND AUTHENTICATION METHOD

摘要

PROBLEM TO BE SOLVED: To improve a processing speed by providing novel means processing A before implementing a substitution computation f for the first time.;SOLUTION: An encryption system of the present invention includes an encryption device and a decryption device. The encryption device is configured to: select N; embed the N in a rate part; generate an encryption initial value of a b-bit by embedding K in a capacity part; substitute the bit having the K embedded in an exclusive OR between a bit having the K of the encryption initial value embedded and a |K|-bit in bit additional authentication data; and let a result substituted by f be a state. The decryption device is configured to: embed the N in the rate part; generate a decryption initial value of a b-bit by embedding the K in the capacity part; substitute the bit having the K embedded in an exclusive OR between a bit having the K of the decryption initial value embedded and the |K|-bit in bit additional authentication data; and let a result substituted by f be the state.;SELECTED DRAWING: Figure 5;COPYRIGHT: (C)2016,JPO&INPIT