A method for manufacturing a high strength hot rolled steel sheet includes heating a slab to a temperature in the range of 1150 to 1300\xb0 C. In at least one embodiment, the method permits the generation of as many secure numbers as are required, while having a maximum security level, which reduces the risks of sending a random number allowing the assignment of entitlements or a credit. The supplementary current supply unit has a capacitor, a voltage that is applied to the capacitor changes in synchronization with the input signal, and the supplementary current is generated by change in the voltage of the capacitor.