Apparatus and method for generating random number using digital logic

There is a random number generation apparatus and method are disclosed using digital logic. Random number generation unit, a shift that moves bit values ​​stored therein sequentially register, the feedback circuit for generating a bit value, generating a predetermined logic operation the feedback signal stored in the shift register, which generates an external signal input to the shift register in step, the shift register to a predetermined logic operation to an external signal generation circuit, and a feedback signal and an external signal, including the input logic circuit which outputs to the shift register and the random number generation method, moving bit values ​​stored in the internal shift register in sequence generating a feedback signal to a predetermined logic operation the stored bit value, the method comprising: generating an external signal input to the shift register, and a feedback signal and an external signal to a predetermined logic operation comprises a step of outputting to the shift register.