Method and system for validating a device that uses a dynamic identifier

A computer-readable storage medium comprising computer-readable program code which, when interpreted by a computing apparatus, causes the computing apparatus to execute a method that includes:

• receiving a first signature from a device;
• decrypting the first signature to obtain a candidate identifier and a candidate scrambling code;
• consulting a database to obtain a set of other scrambling codes associated with the candidate identifier, the other scrambling codes having been encoded in signatures received before the first signature;
• validating the first signature based on a comparison of the candidate scrambling code to the set of other scrambling codes associated with the candidate identifier;
• and
• updating the set of other scrambling codes associated with the candidate identifier to include the candidate scrambling code.

A system for processing signatures received from devices, comprising:

• an interrogation portion configured to receive a first signature from a particular device;
• and
• a processing portion configured to:
• decrypt the first signature in order to obtain a candidate identifier and a candidate scrambling code;
• consult a database in order to obtain a set of other scrambling codes associated with the candidate identifier, the other scrambling codes having been encoded in signatures received before the first signature;
• validate the first signature based on a comparison of the candidate scrambling code to the set of other scrambling codes associated with the candidate identifier;
• and
• update the set of other scrambling codes associated with the candidate identifier to include the candidate scrambling code.