基于阻变存储器的物理不可克隆函数设计

Design of Physical Unclonable Function Based on Resistive Random Access Memory

物理不可克隆函数(PUF)将集成电路制造过程中产生的工艺变化作为一种安全原语,已被广泛应用于硬件安全领域,特别是身份认证和密钥存储。提出了一种基于阻变存储器(RRAM)阵列的PUF优化设计,采用2T2R差分存储结构,并利用阵列中RRAM单元的阻值变化产生PUF的随机性,以实现更高安全级别所需的大量激励-响应对(CRP)。RRAM PUF的存储单元基于28 nm工艺实现,其面积仅为0.125μm~2,相比传统PUF存储单元面积开销减小,在入侵和侧信道攻击方面具有更好的鲁棒性。实验数据表明,RRAM PUF唯一性达到了约49.78%,片内汉明距离为0%,一致性良好,具有较好的随机性。

The physical unclonable function(PUF)uses process changes generated during integra-ted circuit manufacturing as a security primitive and has been widely used for hardware security field,specifically for identity authentication and key storage.A PUF optimized design based on resistive random access memory(RRAM)array was proposed.The 2T2R differential storage structure was adopted and the randomness of the PUF was generated by the resistance change of RRAM cells in the array,achieving a large number of challenge-response pairs(CRPs)required for a higher security level.A RRAM PUF with a memory cell area of 0.125μm2 was designed based on 28 nm process,which had a smaller area overhead than that of the conventional PUF memory cells.It provides better robustness against intrusion and side-channel attacks.The experimental data show that the uniqueness of RRAM PUF reaches about 49.78%,the on-chip Hamming distance is 0%,showing good consistency and randomness.