It proposes a system where OTPs are generated from grid cards containing numbers and letters. When logging in, a user must provide their password and the contents of a randomly selected cell from their unique grid card. Adding salt passwords and generating challenges from least-used cells increases security by preventing prediction …
The proposed device for receiving signals contains filters, an amplifier, a detector, and additionally, a multiphase pulse generator, and an analog switching unit with resistors. The switching unit is inserted between the amplifier and the second filter. The pulse generator contains a pulse counter, a modulo 2 adder, and an inverter.