Method of generating a cryptographic transformation, tamper resistant device using the same, and methods of using the device

(57) The safe code right unit (225) for regulating access to summary digital contents (215) by cryptography is equipped with the exclusive cryptographic unit (26) which protects access to an interface control processor (235) and a memory (265). Then, a cryptographic unit uses the right key stored, changes other data received from the control processor (235), and outputs a contents decryption key (267). Since it does not have a function which carries out direct access in a guarded memory (265), a control processor (235) maintains the effect of security, even if a control processor (235) is spoiled. In order to prevent the reverse engineering of cipher converting, in the present invention, the algorithm generation machine which outputs an algorithm definition in the form which can be opportunity read using random sauce is shown. Since a secret is not included in the generation machine itself, it can transmit and open collation can be made to be received. According to other features, the content provider (200) can search access of the user (290) who can get the contents (275) decoded by the output device (280).