Encryption method and device for nonvolatile memory in security chip

Abstract

The invention provides an encryption method and device for a nonvolatile memory in a security chip. The encryption device for the nonvolatile memory of the security chip comprises main equipment, a bus, an encryption circuit and a nonvolatile memory, wherein the encryption circuit comprises four round encryption circuits and an encryption sequence generator, each round encryption circuit is divided into five layers of round encryption units, and each layer of round encryption unit comprises a key addition operation unit, a nonlinear operation unit, a linear operation unit and a replacement operation unit; when the round encryption circuit executes encryption, the first round encryption circuit begins to execute encryption, the other round encryption circuits sequentially encrypt in sequence, ciphertext obtained after encryption processing is completed is input into the nonvolatile memory, and the encryption process is completed. According to the method, a 2-4 rounds of symmetric algorithm structure is utilized, and the encryption strength and speed are improved within a small round number; meanwhile, the encryption method comprises a nonlinear mask transformation method, and it isguaranteed that no plaintext exists in the whole data migration process.

Description

technical field [0001] The invention relates to the technical field of chip security, in particular to a non-volatile memory encryption method and device used in a security chip. Background technique [0002] Embedded non-volatile memory cells are an important part of secure chips. It is usually used to store important sensitive information such as system keys, and this part of information is the key protection part of the security chip. Attackers can use physical attacks and fault injection to obtain data in non-volatile storage units, and can also obtain data in non-volatile storage units that are being read through power consumption analysis. [0003] First of all, in order to prevent attackers from using physical attacks and fault injection to obtain these important information, security chips usually use memory encryption to encrypt data stored in non-volatile storage units, so that attackers can obtain non-volatile When the data in the volatile storage unit is delete...

AI Technical Summary

Problems solved by technology

For this project, the present invention designs a non-volatile memory encryption method and device used in a security chip, which directly converts the encrypted data used in the non-volatile memory in the security chip into bus encrypted data without any plaintext Information that can solve security issues in secure payment and its operation supervision

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