Patent ID: 8698605
Filing Date: 2014-04-15
Classification: H04L,H04W

Abstract:
1. Reader for determining the validity of a connection to a transponder wherein the reader is adapted to send a first binary code based on predefined numbers to said transponder and to receive a second binary code from said transponder in response to the first binary code, wherein the reader is designed to measure a response time of said transponder based on a time interval between sending the first binary code based on predefined numbers to said transponder and receiving the second binary code from said transponder in response to the first binary code and wherein the reader is designed to authenticate the transponder based on the received second binary code simultaneously with the measuring of the response time wherein the reader is designed to send a first random number to the transponder and to receive a second random number from the transponder for generating the first binary code based on the first random number and the second random number, wherein the first random number and the second random number correspond to the predefined numbers, and wherein the first binary code is a random number or a predefined number depending on the first and the second random number; and wherein the reader is designed to authenticate the transponder based on an evaluation whether the second binary code is valid, the second binary code being generated based on the first binary code, the first random number and the second random number.