Preventing Dynamic Obfuscation of Scan Chain Structures Using Scan Chains to Attack Integrated Circuit Chips

Abstract

The invention discloses a dynamic mixed scanning chain structure for protecting an integrated circuit chip from being attacked through a scanning chain, and the structure consists of a control unit (1A), a linear feedback displacement shift register (1B), a shielding chain (1C), and an exclusive-OR gate set (1D). The structure consists of all digital elements, is embedded into an integrated circuit, and can mix the scan chain structure in the integrated circuit chip, so the input excitation and output response obtained by a tester are obtained through mixing. An attacker is difficult to obtain the real test input / output and scanning chain structure, thereby achieving a purpose of protecting the integrated circuit chip. The structure can protect the integrated circuit chip from being affected by a non-destruction chip attack based on the scanning chain, and prevents the internal sensitive information of the chip from being leaked. Meanwhile, the needed additional area and power consumption are very small, the impact on the design of an original integrated circuit chip and a test flow is small, and the test time cannot be increased.

Description

technical field [0001] The present invention relates to a dynamic obfuscation scan chain structure for preventing the use of scan chains to attack integrated circuit chips, more precisely, it is a dynamic obfuscation scan chain suitable for preventing attackers from using scan links to attack integrated circuit chips in the supply chain The circuit structure belongs to the technical field of integrated circuit chip intellectual property and security protection. Background technique [0002] An integrated circuit (integrated circuit) is a tiny electronic device or component. It is a semiconductor manufacturing process such as oxidation, photolithography, diffusion, epitaxy, aluminum evaporation, etc., which integrates semiconductors, resistors, capacitors and other components required to form a circuit with certain functions and the connecting wires between them into a small piece of silicon. On-chip, and then welded electronic devices packaged in a tube; all the components ...

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However, with the continuous development of new technologies, these methods have the possibility of being broken

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