Adopting DES algorithm to consumer password

the password dialing device is compatible with the existing bank password system. There is no line to telephone by using the sound coupling technology

thus guarantees user confidentiality of password. Its hardware supporting I~2C bus protocol volume is small and compact

then it is carried conveniently. Through the replacement of consumer dialing with the password dialing device replaces by hand

it increases the safe dialing function of system

solving the potential safety hazard existing in the banking system of the telephone at present rationally without changing the already existing systematic work pattern.