DEVICE KEYS FOR NNL ENCRYPTION OF SOFTWARE UPDATE APPLICATIONS

摘要

The present invention provides a device (40), and methods relating to protection schemes. By decrypting (step 56) an enabling key using certain node keys, and decrypting message data (step 58) by using the enabling key, information processing devices that are able to decrypt the enabling key, also become able to decrypt the encrypted message data distributed to said information processing devices. This has the consequence that information processing devices (40) that are unable to decrypt the enabling key fail to read the new data that may comprise new applications or message data, and are therefore in practice revoked. This may be applied to software updates of drivers and terminal types, to mention a few examples.