PUF (physical unclonable function) circuit and on-chip memory encryption and decryption circuit

Abstract

The invention discloses a PUF (physical unclonable function) circuit and an on-chip memory encryption and decryption circuit, belongs to the technical field of intelligent IC (integrated circuit) cards and realizes on-chip memory encryption and decryption with low power consumption and short period. The PUF circuit comprises an RS (reset-set) trigger, wherein the RS trigger comprises a first NAND gate and a second NAND gate which are in cross coupling, and an output end of the first NAND gate is taken as a PUF value.

Description

technical field [0001] The invention relates to the technical field of smart IC cards, in particular to a PUF circuit and an on-chip storage encryption and decryption circuit. Background technique [0002] Banks in China and around the world are undergoing "EMV migration". EMV migration means that banks abandon the previously used magnetic stripe cards and switch to smart IC cards with higher security performance. The main reason is that there have been many cases of copying magnetic stripe cards and stealing bank customer information and funds in the world in recent years. In order to avoid potential huge risks, the bank decided to abandon the use of magnetic stripe cards and use financial IC cards with higher security. [0003] The financial IC card is composed of CPU, bus, cryptographic algorithm circuit, memory and other modules. Among them, the cryptographic algorithm module is the guarantee of the security of the chip. The financial IC card uses the cryptographic al...

AI Technical Summary

Problems solved by technology

[0006] First, the work of accessing data is very busy. If traditional cryptographic algorithms are used to encrypt, the power consumption of the circuit will be very large, which is unacceptable for embedded systems

[0007] Second, if encrypted with traditional cryptographic algorithms, it will seriously affect the performance of the entire system

[0008] Third, even if the stream cipher is used to generate the key stream, it is still problematic to perform "XOR" operation with the access data to realize encryption and decryption of on-chip storage

First of all, in order to successfully decrypt the encrypted data, the key used for encryption needs to be stored, and storing the key stream consumes a lot of resources

Second, if a stream cipher is used, then its root key should be stored in the system's non-volatile memory, which is also vulnerable to intrusive attacks

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