Program unauthorized person revocation system, encryption device, and encryption method

摘要

Distribution member set data is personal information of members that are allowed to decrypt the encrypted public key and the random number is stored, the shared key is input, and is information different for each member shared key, and distribution members aggregate data, the encryption device 400 for distribution by generating an error correction ciphertext is the ciphertext of the error information and error with ciphertext is an encryption statement containing the error information, is connected to the encryption device, to its own devices and the public key the corresponding private key is stored, it is received from the encryption device error correction ciphertext and error with the ciphertext, it is determined that the device itself whether or not it is included in the distribution member aggregate data, the self-device to the distribution member the aggregate data When included are, and a decoding device 500 to output the shared key by removing the error information from the error with the ciphertext for decoding the error correction ciphertext and error with encrypted by a private key and a public key, the decrypted.