ENCRYPTION DEVICE, ENCRYPTION METHOD, ENCRYPTION PROGRAM, DECRYPTION DEVICE, DECRYPTION METHOD, DECRYPTION PROGRAM, AND INFORMATION DISTRIBUTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To prevent contents from leaking out from a mediation server.;SOLUTION: An encryption device comprises: a content acquisition unit 335 for acquiring an encrypted content which is pre-encrypted by a common key to be used for encryption and decryption in common; a common key encryption key 334 for encrypting at least the common key on the basis of unique information that is unique to each user; and a transmission unit 322 for transmitting the encrypted common key encrypted by the common key encryption unit and the encrypted content acquired by the content acquisition unit 335 to a decryption device holding the unique information.;COPYRIGHT: (C)2013,JPO&INPIT