Method and system for providing bus encryption based on cryptographic key exchange

The system for protection against unauthorized copying of digital contents stored on a storage medium has been described. The system comprises a number generator, an encryption subsystem and the nonce to generate a decryption subsystem (nonce). Encryption subsystem before transmitting the encrypted data via a data bus, the data accessed from the storage medium containing a key distribution data block is encrypted using an encryption bus key. At least a portion of the bus encryption key is a key distribution data block, at least one device key assigned to the encryption subsystem, is derived based on the nonce generated by the number generator. Encryption subsystem is coupled to the data bus, the encrypted data received over the data bus to at least a portion of the key distribution data block, based on the nonce generated by the at least one device key, the number generator is assigned to the encryption subsystem to be decrypted using a decryption bus key derived.Storage medium, a random number generator, the key distribution data block, the bus key, the device key, nonces, the data bus.