Patent ID: 8110008

Claim:
Secure paper, comprising: at least one fiber layer; and at least one electronic chip integrated in the fiber layer, said chip including a memory in which at least a first key is stored for use in authenticating the secure paper; the chip being configured to spoil the first key in the event of an attempt at forced access to the chip, so as to make it impossible subsequently to authenticate the secure paper, wherein the memory comprises a first zone suitable for storing data without any possibility of the data being read by a reader device external to the chip, and wherein the first key is stored in the first zone, and the memory comprises a second zone suitable for storing data that can be read by the reader device external to the chip, and wherein an identifier associated with the paper is stored in the second zone, the first key is generated by encrypting said identifier by using a second key, with the help of an algorithm, and the chip contains a program configured to execute a second algorithm, the second algorithm enabling a response to be generated by making use of the first key to encrypt a random number issued by an authentication device and received by the chip.