Random Number Generation Using Memory Cell Sensing Currents
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Solution Overview
Problem
Existing random number generators in rewritable non-volatile memory modules are vulnerable to data analysis attacks, as their generated numbers may exhibit regularity and predictability, compromising security in applications like digital cameras and cellular phones.
Innovation Solution
A method that involves writing data into memory cells and repeatedly reading them using a first read voltage to obtain sensing currents, which are then used to generate random numbers, ensuring the randomness and unpredictability of the generated numbers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard random number generator is used, then the random number can be generated efficiently, but the generated numbers may exhibit regularity and be vulnerable to data analysis attacks
Solution Approach 1:
The memory device generates random numbers using its own inherent physical characteristics (threshold voltage distribution, sensing current variations) without requiring external random number generation circuits or algorithms, thus improving security while avoiding additional device complexity
Solution Approach 2:
The patent replaces traditional software-based or algorithmic random number generation with physics-based random number generation using the inherent electrical characteristics of memory cells, substituting a mechanical/computational system with a physical phenomenon-based system that is inherently more secure
2Reliability
If memory cells are read repeatedly to generate random numbers, then the randomness and unpredictability improve, but the generation time increases
Solution Approach 1:
The patent performs a limited number of repeated reads (excessive but controlled) to obtain sufficient sensing current variations for random number generation, achieving adequate randomness without excessive time consumption by stopping once sufficient data is collected
Data Source
AI summary
A method for generating a random number, a memory storage device and a control circuit are provided. The method includes: writing data into a plurality of memory cells; reading at least one of the memory cells repeatedly according to a first read voltage to obtain a plurality of sensing currents; and generating the random number according to the sensing currents.