Multiple-way switching PUF (physical unclonable function) circuit and serial number output circuit

Abstract

The invention relates to the technical field of integrated circuits, particularly to a multiple-way switching PUF circuit and a serial number output circuit. The multiple-way switching PUF circuit comprises a time-delay switching circuit and a decoding circuit, wherein the time-delay switching circuit selects the identical pulse signals input from different signal input ends, converts the pulse signals into delay signals of different rates and sequentially outputs the delay signals through different signal output ends; the input end of the decoding circuit is correspondingly connected with a plurality of signal output ends of the time-delay switching circuit, and according to the sequence that the delay signals output by the signal output ends reach the decoding circuit, processes the delay signal first reaching the decoding circuit to generate dual-bit output values, so that chips manufactured from the multiple-way switching PUF circuit obtain ideal indexes on randomness, uniqueness, reliability on the like and reduce tape-out risks. Besides, the invention also discloses a serial number output circuit composed of a plurality of connected PUF circuits, and accordingly the serial number output circuit obtains a serial number concealing and protecting function.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a multiplexable PUF circuit and a serial number output circuit. Background technique [0002] In the field of integrated circuits, the wafers and chips produced need to be marked with special unique serial numbers to distinguish the wafers or chips. In this technical field, the method for distinguishing the serial numbers of wafers and chips is in the Write a special serial number in EEPROM or EFLASH to achieve the purpose of distinction, but the serial number stored in the chip by this method is very easy to be modified or erased, and it is also easy to be read, which makes the chip easy to be deciphered. crack. [0003] In response to this situation, PUF technology came into being. PUF technology uses the unique physical characteristics of silicon wafers and the variability of IC manufacturing process to identify each chip, thereby judging the authenticity of the c...

AI Technical Summary

Problems solved by technology

In the existing PUF technology, PUF introduces a natural random source, which produces an almost unpredictable and replicable algorithm, increases system security, and also makes the serial number stored in the chip unable to be modified, erased and read at will

However, many chips manufactured using PUF technology have poor reliability, and tape-outs are prone to failure.

For example, the arbiter PUF generates multi-bit output values ​​by combining a single PUF circuit in parallel, but each delay path cannot communicate with each other, or the interconnection is less, if one of the delay paths has a large error that is different from other delay paths, it may be It will cause the output of the chip to be a fixed value that does not change according to the input, resulting in unsatisfactory reliability (Reliability) and uniqueness (Uniqueness) indicators of the chip, resulting in low commercial possibility and high risk

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