Secure transmission method and circuit of chip security information

Abstract

The invention discloses a secure transmission method and circuit of chip security information. The circuit comprises a control register used for starting security information transmission, an NVM used for storing the security information, a data register set used for loading the chip security information, a register used for generating an NVM access address, a counter used for recording a security information loading state, and a related combined logic unit. When the chip security information is accessed, firstly software sets the register used for starting the security information transmission to start access and transmission of the chip security information; hardware automatically performs read operation on the NVM used for storing the security information, decrypts returned data, and writes the data in the data register set used for loading the chip security information; and if the security information transmission is not finished (by judging a value of the counter used for recording the security information loading state), an access address register of the NVM is updated and the access and transmission of a next group of security information are started. The method provided by the invention can effectively protect the transmission of the chip security information.

Description

technical field [0001] The invention belongs to the field of safety design of integrated circuit chips, and in particular relates to a safe transmission method and circuit of key data information related to the safety function of the chip. Background technique [0002] With the rapid development of microelectronics technology, hardware indicators such as CPU processing power and memory capacity of smart card chips have been greatly improved. The continuous maturity of smart card technology makes it an ideal solution for many industries to solve traditional problems, and it plays an increasingly important role in many fields such as mobile communications, social security, medical care, and financial payment. The wide application of smart card chips has made users have higher requirements for the security of smart card chips. [0003] In order to improve the security of smart card applications, many security mechanisms have been introduced into the design of smart card chips,...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the security problem that the software participates in the access and transfer process of the chip security information, which may lead to the leakage of the chip security information

Images