Method, system and computer program product for a trusted counter in an external security element for securing a personal communication device

摘要

Method, system and computer program product for implementing a trusted counter in a personal communication device. In particular, the method, system and computer program product utilizes cryptography and an external, read-write storage device that stores important state information that cannot be modified without detection. Using the present invention, the counter can be implemented in a personal even if state information is stored in an insecure storage device.