A chip and its internal module encryption system

Abstract

The invention belongs to the technical field of a chip design and provides a chip and inner module an encryption system thereof. The system comprises a nonvolatile storage module and a processing and controlling circuit, wherein the nonvolatile storage module is used for storing an encryption protection policy and a decipherment algorithm; and the processing and controlling circuit is used for reading and analyzing the encryption protection policy stored in the nonvolatile storage module when peripheral equipment is connected with an invasion interface of the chip, and protecting a protected inner module of the chip according to the analyzed encryption protection policy. According to the chip and the inner module encryption system thereof, the decipherment algorithm in a software form and the processing and controlling circuit in a hardware manner are separately realized, so that when the decipherment algorithm needs to be changed, a user can directly change the decipherment algorithm stored in the nonvolatile storage module; the chip does not need to be taped out again, so that the changing cost is extremely reduced and the utilization flexibility is enhanced; and the user can customize the decipherment algorithm and the cracking difficulty is improved, so that the reliability of the chip is improved.

Description

Technical field [0001] The invention belongs to the technical field of chip design, and particularly relates to a chip and its internal module encryption system. Background technique [0002] With the development of integrated circuits, the design of electronic products is developing in the direction of openness, and more hardware solutions are disclosed. In order to facilitate programming and debugging, chips generally provide corresponding programming interfaces, debugging interfaces or other external connections The interface of the device. [0003] The open interface makes the internal function modules of the chip vulnerable to illegal intrusion from the outside, and the internal operating mechanism of the chip is easy to be cracked. For this reason, the prior art provides the following two ways to protect the internal modules of the chip: [0004] 1. Complete protection mode. Such as figure 1 As shown, in this way, the user writes an unencrypted program to the non-volatile mem...

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Problems solved by technology

[0007] The purpose of the embodiments of the present invention is to provide a chip internal module encryption system, aiming to solve the problem of high cost and poor flexibility in changing the decryption unit in the password encryption protection method for protecting the chip internal module provided by the prior art

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