High-speed sufficient-entropy digital physical noise source device

Abstract

The invention provides a high-speed sufficient-entropy digital physical noise source device comprising a first oscillator, a second oscillator, a linear wave converter, an analog-digital converter, anentropy estimation circuit, a bit width converter and a random number storage. According to the device provided by the invention, the enough random quantity is collected within an extremely short sampling interval via the analog-digital converter, so that the throughput rate of the noise source is significantly improved; meanwhile, the entropy estimation circuit and the bit width converter are used for continuously monitoring an entropy output by a noise source during the running period of the noise source, so that the situation that the output has the characteristic of sufficient entropy isensured, and thus the random number service with high quality is provided. Furthermore, the bit width converter can adjust the size of the bit width meeting the sufficient entropy condition in real time according to the transmitted measurement result, and thus the robustness of the noise source when in use is enhanced.

Description

technical field [0001] The invention relates to the technical field of applied cryptography, in particular to a high-speed foot-entropy digital physical noise source device. Background technique [0002] Digital physical noise source (referred to as noise source, also known as true random number generator) is one of the basic cryptographic modules, and the random numbers generated can be used for key generation in block cipher algorithms, security protocols, and resistance to side-channel attacks. The amount of randomness contained in the noise source directly determines the security of the cryptosystem. When the randomness contained in the noise source cannot meet the requirements of the security level of the cryptosystem where it is located, then the cryptosystem will have security risks, and such a system is vulnerable to hacker attacks. [0003] In cryptography, the magnitude of randomness is usually measured by entropy. The size of the entropy contained in a noise sou...

AI Technical Summary

Problems solved by technology

In fact, due to device aging, large changes in the environment (temperature, humidity, etc.), or external malicious attacks (such as error injection attacks), the actual output entropy value may not meet the requirements of the cryptographic system.

2. When the noise source is realized, the deterministic interference existing in the circuit will act on the jitter of the oscillating signal. These interferences come from the power supply in the operating environment, etc.

However, the amount of jitter in one cycle is much smaller than the cycle value, which leads to the fact that the sampling interval often needs to be very long, so the throughput rate is low

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