Method and device for reconstructing hardware secret key of memory

Abstract

The embodiment of the invention provides a hardware key reconstruction method and device for a memory. When the memory reaches a preset state, the CPU reads numerical values of a plurality of fixed storage units in the memory based on preset first position information to obtain a first material sequence; and the CPU obtains stored second position information from the block chain network, reads a corresponding numerical value in the first material sequence based on the second position information to obtain a second sequence, performs error correction on the second sequence by using an error correction coding algorithm, recovers a second standard sequence, and reconstructs a hardware key of the memory based on the second standard sequence. Wherein the second position information comprises the position information of a sub-sequence, which is the same as the second standard sequence, in a material sequence in the last secret key reconstruction; the subsequence is a stable numerical value sequence obtained through selection based on the flipping probability of a plurality of numerical values in the material sequence, and the flipping probability is updated through information in last secret key reconstruction.

Description

technical field [0001] One or more embodiments of this specification relate to the technical field of data security, and in particular to a method and device for reconfiguring a hardware key of a memory. Background technique [0002] In the stage of rapid development of network applications such as the Internet and the Internet of Things, when different devices communicate with each other, information will be encrypted and transmitted, and devices will be authenticated. These measures to improve security are becoming more and more important. Operations such as encrypted transmission and device authentication can be performed using the hardware key of the memory. The hardware key of the memory is a key determined by utilizing the inevitable random difference in the internal physical structure of the memory after power-on. After power-on and uninitialization, multiple storage units of the memory will have a biased value of 0 or 1. Using these values, the hardware key of the m...

AI Technical Summary

Problems solved by technology

However, as the memory is used, the bias of its memory cells may change due to factors such as temperature, humidity, or aging

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