transponder, leitor, sistema de comunicação, método para transmissão de um número de identificação fixa a um leitor, método para recebimento de um número de identificação fixa de um transponder, meio legível por computador e elemento de programa.

摘要

Transponder (180) having stored a fixed identification number, which expands said identification number with a random number, encrypts said expanded number with a key, and sends it to a reader (160) on its request. Reader (160), which on request receives an encrypted number from a transponder (180), decrypts a received encrypted number with a key, which was also used by the transponder (180), and extracts a fixed identification number associated with the transponder (180).