Physical Unclonable Functions (PUF) exploits process variation across the same structure circuits during the manufacturing processes to generate numerous unique, random and unclonable security keys. In this paper, a multi-port configurable PUF scheme is proposed, which is based on random deviation of current mirrors. It consists of input register, deviation-voltage source, multiplexing-net, arbiter array and obfuscation circuit. After configuring deviation-voltage source by applying different input challenges, the PUF circuit updates keys without physically replacement, and it can generate multi-bit keys in a clock cycle. In SMIC 65 nm CMOS technology, the layout of 36 ports configurable PUF occupies 24.8 μm×77.4 μm with custom designing. Experimental results show that the PUF circuit possesses better statistical characteristic of uniqueness and randomness, and it has a high reliability of 97.4% with respect to temperature variation from ?40 °C to 125 °C, and supply voltage variation from 1.08 V to 1.32 V. It can be effectively used in information security field.
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