Patent ID: 8069350

Claim:
An electronic communication system, comprising: a base station arranged to be secured against unauthorized use and a remote device configured to exchange cipher data bits, with the base station to perform authentication by: providing a first pseudo random number for a first authentication session; and in response to successfully performing authentication in the first authentication session providing a second pseudo random number for a second authentication session; and wherein the communication system further includes: at least one random number generator being at least one of arranged at the base station, and being designed for generating the random numbers on 96-bit basis; at least one first memory for providing the base station with at least one of an identifier number on a 32-bit basis, and at least one first cipher unit and at least one second cipher unit with at least one secret key on 128-bit basis, and for providing the base station with at least one configuration on 32-bit basis; and at least one second memory for storing the further random number at least one of the base station and the remote device; and wherein: the first cipher unit is arranged at, at least one of the base station and the remote device, and the first cipher unit being designed for providing the remote device with at least one message authenticator-16-bit basis, the first cipher unit being operated by AES128 based on electronic codebook mode; the second cipher unit is arranged at, at least one of the base station and the remote device, and the second cipher unit being designed for providing the base station with at least one first response, on 96-bit basis and at least one encrypted second response with at least one instruction; the second cipher unit being further arranged to write the further random number on the second memory and to check the authenticity of the further random number by comparing the second response with the output of the second cipher unit of the base station, wherein the further random number is written if the second response equals the output of the second cipher unit; and the second cipher unit being operated by AES128 based on at least one second AES mode based on output feedback mode.