Patent ID: 8938623
Filing Date: 2015-01-20
Classification: G09C,H04L

Abstract:
1. A cryptographic processing system comprising: a key generation device, an encryption device, and a decryption device, and serving to execute a cryptographic process using a basis B wherein the key generation device includes circuitry configured to provide: a first KP information input part which takes as input, a variable ρ a first CP information input part which takes as input, an attribute set Γ a main decryption key generation part which generates an element k* a KP decryption key generation part which generates an element k* a CP decryption key generation part which generates an element k* wherein the encryption device includes circuitry configured to provide: a second KP information input part which takes as input, an attribute set Γ a second CP information input part which takes as input, a variable ρ a main encrypted data generation part which generates an element c a KP encrypted data generation part which generates an element c a CP encrypted data generation part which generates an element c wherein the decryption device includes circuitry configured to provide: a data acquisition part which acquires encrypted data ct a decryption key acquisition part which acquires a decryption key sk a KP complementary coefficient calculation part which, based on the attribute set Γ a CP complementary coefficient calculation part which, based on the variable ρ a pairing operation part which calculates a value K by conducting a pairing operation indicated in Formula 1 for the elements c [Formula 1] is as follows: