Abstract: A two-varying-password generator having two varying passwords of different digit lengths and different time intervals is disclosed. A two-varying-password generator has a printed circuit board where a processor is soldered onto, a battery, a display window and an on/off key and code key. The processor is loaded with two predetermined programs that can produce two passwords (or more than two passwords) of different digit length and different time interval. Meanwhile, the host computer also stores these two programs in the customer's account. As the clocks of both two-varying-password generator and host computer work in synchronously, both of them can produce two identical passwords of the same moment. Application of two-varying-password generator can counter phishing sites, fight credit card forgery and unauthorized transaction, tackle cloned ATM card.