Patent ID: 6424717
Filing Date: 2002-07-23
Classification: H04J,H04L,H04N

Abstract:
A secure element for use in a receiver that receives a plurality of messages addressed to the receiver, the plurality of messages including messages having an encrypted content and being sent on behalf of an entity that determines whether the receiver has access to instances of services received in the receiver, the secure element comprising:writable non-volatile memory wherein is stored a plurality of keys including a public key-private key pair for the receiver and a public key for the entity, wherein the writable non-volatile memory includes all public keys stored in the receiver; and a processing apparatus coupled to the non-volatile memory, the processing apparatus including apparatus for decrypting and authenticating the messages, wherein the decrypting apparatus uses the private key for the receiver to decrypt the message content of at least one message of the plurality of messages, and the authenticating apparatus uses the public key for the entity to determine whether the message content is authentic, the processing apparatus not responding to the message content unless the at least one message is authentic.