A random number generator is provided. The random number generator includes a linear feedback shift register and rotator. The linear feedback shift register is configured to provide a first pseudo-random number signal with a first value, wherein the first pseudo-random number signal includes a plurality of bits. The rotator is configured to shift and rotate the plurality of bits of the first pseudo-random number signal according to a signal to generate a second pseudo-random number signal with a second value. The second value is different from the first value.