Anti-tamper shielding layer for security chip

Abstract

The invention discloses an anti-tamper shielding layer for a security chip, comprises anti-tamper wires and functional wires, both of which mix with each other. The anti-tamper shielding layer furthercomprises at least two sets of physical wirings, wherein the anti-tamper wires share at least one set of physical wiring with the first functional wire in a time division multiplex manner, and the remaining physical wiring is the anti-tamper wires, the second functional wire, or a combination of the anti-tamper wires and the second functional wire. By using the signal wires of the key modules inthe security chip as the functional wires and mixing them with the anti-tamper wires, the anti-tamper design in the anti-tamper shielding layer has not only a simple anti-tamper function but also other logic functions. The anti-tamper shielding layer makes it difficult for the attackers to remove the anti-tamper shielding layer separately, and avoids the leakage of the key information in the sensitive data of the chip caused by the removal of the anti-tamper shielding layer and the anti-tamper function, thereby improving the security performance of the chip.

Description

technical field [0001] The invention relates to chip security technology, in particular to a circuit structure capable of preventing attackers from maliciously detecting and modifying the internal circuit structure of a security chip through means such as FIB. Background technique [0002] Security chips usually store confidential information of customers, such as bank card passwords, fingerprint information, digital TV payment information, etc., so the security of such chips is very important. [0003] In order to ensure the security of this type of chip, logically secure chips use DES, AES, RSA and other encryption algorithms for encryption and decryption, such as Figure 4 shown; and at the physical design level, complex metal traces are commonly used to cover the surface layer of the chip to form a tamper-proof shielding layer, and the metal traces in the tamper-proof shielding layer are detected by analog or digital methods, and finally Output one or more status bits to...

AI Technical Summary

Problems solved by technology

The invention increases the difficulty for an attacker to release the anti-tamper function by mixing the anti-tamper line and the function line (non-tamper-proof function), and solves the problem of the decline in security performance of the current anti-tamper technology

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