... 288 Development and Implementation of RFID Technology [4] L Bolotnyy, and G Robins, “Generalized yoking-proofs for a group of RFID tags”, in Proc of MOBIQUITOUS 2006, July 2006 [5] S Brands and ... help of the backend server It then randomly selects two integers n1 and The Study of RFID Authentication Protocols and Security of Some Popular RFID Tags 269 n2, and computes the values A, B, and ... ), bitwise AND ( ∧ ), addition mod 272 Development and Implementation of RFID Technology 2m (+), and left rotate ( Rot ( x, y ) ) Rot ( x, y ) is defined to left rotate the value of x with y...