True random number generating circuit

Abstract

The invention discloses a true random number generating circuit. The true random number generating circuit comprises a high-frequency oscillator, a low-frequency oscillator and a T trigger, wherein the high-frequency oscillator is used for generating high-frequency clock signals, the low-frequency oscillator is used for generating a noise source on the basis of resistance thermal noise, the clock input end CLK of the T trigger is connected with the output end of the low-frequency oscillator, and the noise source generated by the low-frequency oscillator serves as a clock signal. The true random number generating circuit further comprises a multi-stage divide-by-2 frequency divider, wherein the input end of the multi-stage divide-by-2 frequency divider is connected with the output end of the high-frequency oscillator, and the output end of the multi-stage divide-by-2 frequency divider is connected with the data input end T of the T trigger. The low-frequency oscillator conducts sampling on the high-frequency clock signals which are processed through frequency division of the multi-stage divide-by-2 frequency divider, and the output end Q of the T trigger outputs true random numbers. The true random number generating circuit has a good random characteristic, is easy to implement, and saves the chip area.

Description

technical field [0001] The invention relates to the field of cryptosystem hardware implementation, in particular to a true random number generating circuit. Background technique [0002] Random numbers are widely used in smart cards, especially in the field of cryptography, and are an important part of the hardware implementation of cryptosystems. Whether it is the public key and private key in the asymmetric algorithm, or the key in the symmetric algorithm, random numbers are needed. The performance of the random number directly affects the security and reliability of the security chip. An ideal random number usually refers to a string of random "1" and "0" sequences, and each bit in the sequence has no correlation with other bits. [0003] Random numbers are divided into pseudo random numbers (PRNG) and true random numbers (TRNG). [0004] Pseudo-random numbers can generally be generated by digital logic circuits, which are random in a short period of time, but they wil...

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Problems solved by technology

In addition, the reduced bandwidth of the amplifier will reduce the randomness of the random number

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