Memory with redefined pins and protection method thereof

Abstract

The invention discloses a memory with redefined pins and a protection method thereof. The memory comprises: a plurality of pins communicated to the outside, an inside unit (12) with a pin configuration module (121) which provides a user programming definition pin and preserves into pin configuration information not allowing outside users of the memory access to, and a pin redefining unit (11) connected with pins through a plurality of bidirectional ports and performing data communication with the inside unit (12) through a plurality of unidirectional signal ports having mapping relationship with each bidirectional signal port; and the mapping relationship between the bidirectional signal port and the unidirectional signal port is reconfigured according to the pin configuration information of the pin configuration module (121). The invention can redefine an outside pin of the memory so that illegal users can not learn the specific meaning of signals inside the memory corresponding to the memory, thereby ensuring safety of inside information of the memory.

Description

technical field [0001] The invention relates to a memory protection technology of an application-specific integrated circuit, and more specifically relates to a pin redefinable memory and a protection method thereof. Background technique [0002] Modern security systems are usually based on public algorithms to ensure communication or computing security, because the algorithms are public, so security is protected by keys. The correct method of key protection begins with the storage of the key. Embedded systems need to store the key in the memory and never let it leak out. Now many chips need to store the key internally. Moreover, many protective measures should be added during the chip design process to prevent the key from being stolen. With the technical progress of chip failure analysis, chip testing and other means, the technology of stealing keys (hereinafter referred to as key attack) is also gradually improving, and the physical layer attack method is the most common...

AI Technical Summary

Problems solved by technology

[0004] The publication number is CN1645603A, and the title of the invention is "Circuit and Chip for Realizing Chip Pin Function Interchange". , so as to realize the technical solution of chip pin function interchange, and solve the problem in the prior art that the chip pin arrangement is not compatible due to the limitation of the chip application environment

However, this patent application has the following defects: since the chip pin function is known, it is not suitable for protecting the memory; the pin function switching unit is transparent to the outside world, and there is no confidentiality; the pin function switching principle is too simple, only The functions of the pins can be interchanged by using a level switch. Therefore, if this technology is used for memory protection, it is easy for an attacker to determine the function meaning of each pin, so as to control the pins to obtain information in the chip. confidential information of

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