Random numbers generators play an important role in data security. They are used for bigger security of users online, in many industrial applications, in medical, military and police facilities, they are being used in gambling and elsewhere. In this thesis we describe basic types of random numbers generators and possible source of randomness as noise of electrical components. In this thesis we focus on random numbers generators with principle of avalanche diode. For analysis of randomness we make a simplified circuit model and derive an analytical formula for entropy of simplified circuit. In the end, we describe how we can ensure a higher entropy, without changing the circuit.
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