Method and device for protecting products against counterfeiting

摘要

A method for protecting a product against counterfeiting is provided that has a transponder associated with the product, upon which at least one unique identifier is stored, wherein a flag in a set or cleared state is associated with the identifier, and when the flag is set, read access to the identifier by a reader is only permitted after authentication. The invention further relates to a transponder for protecting a product against counterfeiting.

主权项

1. A method comprising:
receiving a request to access a first unique identifier stored in a shadow memory area of a transponder, read access to the first identifier being based on a state of a flag and on knowledge of secret shadow memory access information, the transponder having a second unique identifier stored in a second memory area; requiring authentication prior to permitting read access to the first identifier in response to the state of the flag having a first value; and permitting read access to the first identifier when the request includes the secret shadow memory access information.