Crypto chip system and secret key extraction method

Abstract

The invention discloses a crypto chip system and a secret key extraction method. The system comprises a public key crypto engine, a symmetry crypto engine, a HASH engine, a one-way function engine, a nonvolatile memory, an execution engine, t secret key assistant management parties and a double-arbiter physical unclonable function module DAPUF. The other purpose of the invention aims at providing a secret key extraction method of the crypto chip system. The method comprises the steps of (1) a secret key generation stage, and (2) a secret key reconstruction stage. According to the invention, an effective bit is selected by an exclusive-or result of the DAPUF, and in combination with the steps and under a condition that multiple challenge / response characteristics are provided, the system and the method enable the obtained response to have the characteristics of no 01 deviation on probability, reliable reconstruction certainty, low average time complexity, small challenge and response redundancy, physical invasion attack sensation and the like.

Description

technical field [0001] The invention relates to the security field of cryptographic chips in information security, in particular to a cryptographic chip system with a high security level and a key extraction method based on the cryptographic chip system. Background technique [0002] High security level keys are usually stored in volatile memory with a tamper detection network. The volatile memory needs long-term power supply to store the key. It can still keep the data for a long time after power failure at low temperature. The cost of the tamper detection network is not low and It has also been proved by the physical intrusion attack PIA experiment that it is not unbreakable. [0003] Extracting the key from the physical unclonable module PUF instead of the key storage scheme has attracted the attention of researchers. PUF is a complex physical system that utilizes the deviation of the production process, its input is called challenge (C), and its output is response (R), ...

AI Technical Summary

Problems solved by technology

[0006] 2) Difficult to clone: ​​the basis of PUF is the deviation beyond the control of the manufacturer, and the manufacturer cannot produce the same PUF, so it is difficult for opponents to clone;

[0012] In summary, the current PUF solutions are difficult to meet the needs of high security level keys in terms of reliability and efficiency

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