An information transmission system includes a first sensing device configured to transmit a cooperation request signal, receive a cooperation response signal corresponding to the cooperation request signal, generate a jamming signal on the basis of the cooperation response signal, and generate and transmit a transmission signal including sensor information; an information collection device configured to receive the transmission signal transmitted by the first sensing device; and at least one second sensing device provided near the first sensing device, and configured to receive the cooperation request signal and transmit the cooperation response signal corresponding to the cooperation request signal to the first sensing device. The cooperation response signal includes channel information between the at least one second sensing device and the information collection device, and a seed for a random signal generator shared between the first sensing device and the at least one second sensing device.