A foot entropy digital physical noise source device

Abstract

The invention puts forward a sufficient entropy digital physical noise device, which comprises a first oscillator, a second oscillator, a first single edge counter, a second single edge counter, a sampling control unit, a counting result conservator, an entropy estimation circuit, a judgment module and a random digit storage module. Through the entropy estimation circuit, an internal entropy valuechange is monitored during the operation period of a noise source; the oscillators of two same structures are adopted to eliminate an influence of deterministic interference on a counting result andsolve the output certainty problem of the noise source; and in a sampling process, a single edge counting method is used, and the problem of poor output balance of the noise source due to an uneven duty ratio in the period of a sampled signal is solved. By use of the device, the random digit output by the noise source can be guaranteed to own a sufficient entropy property.

Description

technical field [0001] The invention relates to the technical field of applied cryptography, in particular to a 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 source is repr...

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.

During implementation, the duty cycle of the sampled signal will be unbalanced, causing the bit sequence generated by such noise source to be unbalanced

Moreover, when the noise source is implemented, the phenomenon of unbalanced duty cycle is very common, even if a balanced duty cycle can be theoretically obtained

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