Patent ID: 8271790

Claim:
A method for securely controlling access to a device that is capable of storing data, the method comprising: obtaining, by a computing device, information related to the device, the information including at least: parameters P associated with the device, a time variable Time, a name N representing an ascription, and a unique identification value I; encrypting by a computing device, a function of the P, N, I and Time values with a symmetric key K to generate a first portion of an unchangeable signature S 1 ; encrypting, by a computing device, the symmetric key K with a shared key to generate a second portion of signature S 1 ; combining, by a computing device, the first and second portions along with the value of N, I and Time into a unique identification parameter and storing the identification parameter on the device; controlling, by a computing device, access to the device by: extracting identification information from the device, checking the validity of the digital certificate of the device; and applying a security policy that is based at least in part on the unique identification.