物理不可克隆函数-多位并行异或运算一体化设计技术

Integrated Design Techniques of Physical Unclonable Function and Multi-bit Parallel Exclusive OR Operations

物理不可克隆函数(PUF)和异或(XOR)运算在信息安全领域均发挥着重要作用。为突破PUF与逻辑运算之间的功能壁垒,通过对PUF工作机理和差分串联电压开关逻辑(DCVSL)的研究,该文提出一种基于DCVSL异或门级联单元随机工艺偏差的PUF和多位并行异或运算电路一体化设计方案。通过在DCVSL异或门差分输出端增加预充电管并在对地端设置管控门,可实现PUF特征信息提取、异或/同或(XOR/XNOR)运算和功率控制3种工作模式自由切换。此外,针对PUF响应稳定性问题,提出极端工作点和黄金工作点共同参与标记的不稳定位混合筛选技术。基于TSMC 65 nm工艺,对输入位宽为10位的电路进行全定制版图设计,面积为38.76 mm^(2)。实验结果表明,PUF模式下,可产生1024位输出响应,混合筛选后可获得超过512位稳定的密钥,且具有良好的随机性和唯一性;运算模式下,可同时实现10位并行异或和同或运算,功耗和延时分别为2.67 mW和593.52 ps。功控模式下,待机功耗仅70.5 nW。所提方法为突破PUF“功能墙”提供了一种新的设计思路。

Physical Unclonable Functions(PUFs),as well as Exclusive OR(XOR)operations,play an important role in the field of information security.In order to break through the functional barrier between PUF and logic operation,an integrated design scheme of PUF and multi-bit parallel XOR operation circuit based on the random process deviation of Differential Cascode Voltage Switch Logic(DCVSL)XOR gate cascade unit is proposed by studying the working mechanism of PUF and DCVSL.By adding a pre-charge tube at the differential output of the DCVSL XOR gate and setting a control gate at the ground end,three operating modes of the PUF feature information extraction,XOR/Negated Exclusive OR(XNOR)operation and power control can be switched freely.Meanwhile,for the PUF response stability problem,the unstable bit hybrid screening technique with extreme and golden operating point participation labeling was proposed.Based on TSMC process of 65 nm,a fully customized layout design for a 10-bit input bit-wide circuit with an area of 38.76 mm^(2)was carried out.The experimental results show that the 1024-bit output response can be generated in PUF mode,and a stable key of more than 512 bit can be obtained after hybrid screening,which has good randomness and uniqueness;In the operation mode,10-bit parallel XOR and XNOR operations can be achieved simultaneously,with power consumption and delay of 2.67 mW and 593.52 ps,respectively.In power control mode,the standby power consumption is only 70.5 nW.The proposed method provides a novel way to break the function-wall of PUF.