Authoring system, authoring key generator, authoring device, authoring method, and data supply device, information terminal and information distribution method

摘要: An authoring system which authors content data to be distributed through an information terminal by encryption for copyright protection includes device and key generator. The generator generates a identifier (CID) uniquely allocated each of the (Content), enabling (CEK) device, (CED) obtained encrypting (Kc) second (EKc) using CID CEK. (Ekc) is formed root (Kroot). has unit decrypts CEK, encrypts decrypted generate authored encrypted (E (Kc, Content)). For proper external authentication, supplies from storage medium holds first authentication securely; random numbers; numbers data; sends terminal; receives, terminal, equal one; compares data.