Ring-shaped oscillator based truly random number generation circuit and truly random number generator

Abstract

The invention discloses ring-shaped oscillator based truly random number generation circuit and truly random number generator in the technical field of integrated circuit design. The ring-shaped oscillator based truly random number generation circuit comprises an oscillation sampling circuit, a postprocessing circuit and a control voltage generation circuit which are connected in sequence; and the sampling circuit comprises a first high-frequency ring-shaped oscillation circuit, a second high-frequency ring-shaped oscillation circuit and a low-frequency ring-shaped oscillation circuit. The ring-shaped oscillator based truly random number generator comprises a three-stage truly random number generation circuit based on a ring-shaped oscillator. The invention solves the problem that a random bit stream generates low-speed phase jitter accumulating and can quickly obtain a random bit stream with better randomness.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design, in particular to a ring oscillator-based true random number generating circuit and a true random number generator. Background technique [0002] True random number is also called digital physical noise source, it is the security source of all cryptographic techniques, and it can be considered as an infinitely long bit stream. Using integrated circuits to obtain true random numbers is one of the most important ways to obtain true random numbers at present. A device capable of producing a true random number output is called a true random number generator. [0003] There are three main methods for implementing true random number generators through integrated circuits: one is the discrete time series method based on chaos; the other is the method of directly amplifying thermal noise; the third is the sampling method based on the oscillator. Although the first discrete time series ...

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Problems solved by technology

Although the first discrete time series method based on chaos can obtain better randomness, its design complexity and circuit complexity are high, the power consumption and area are large, and the rate of output bit stream is low.

The second direct amplification method usually adopts the method of amplifying and sampling the thermal noise of the resistor, but the lack of shielding of the noise from the power supply and the substrate in the integrated circuit makes the random number generator very sensitive to the coupling of the signal, and the randomness of the random bit stream sex is also affected

However, experiments have shown that the sequence generated by the classic oscillator sampling method is not enough to meet the requirements of randomness, so a post-processing circuit is usually added to improve the randomness of the random sequence

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