The Research On RRAM-based Hybrid PUF Technology

Physical unclonable function(PUF)chip fingerprint technology is an ideal and secure identity authentication technology.By capturing the random process deviation of the device and the connection generated during the manufacturing process,the PUF chip fingerprint circuit can generate a fingerprint ID to identify the legal identity of different electronic products,thus effectively avoiding the defects of traditional identity authentication methods.However,PUF circuits are sensitive to environmental factors,such as noise,temperature,voltage and aging,which often cause changes in the output fingerprint of the PUF.This paper introduces a RRAM device with good randomness as the entropy source,and proposes a hybrid entropy source deviation scheme based on this RRAM to improve the PUF.The specific research results are summarized as follows:In terms of the RRAM device,this paper designed a new type of RRAM device using Al/AlOx/Graphene.With AlOx as the resistive layer and graphene electrode as the inert electrode layer,the "E" shape central symmetrical structure was conducted and greatly improved the on-off ratio and resistance value distribution width,compared with that of the traditional sandwich structure with HtO2 and TiO2 as the resistive layer.After the new graphene electrode RRAM chip was taped out,the circuit simulation model was established by measuring related parameters under different conditions to improve the RRAM design process and simulation accuracy.In the aspect of SRAM-RRAM hybrid entropy source,based on the effect of the PUF internal deviation,external noise,environmental conditions,etc.on the output of fingerprint value,a SRAM-RRAM hybrid entropy source deviation generation mode was proposed to improve the PUF internal deviation..The symmetrical RRAM resistance deviation was introduced as the random entropy source of the PUF unit to improve its uniqueness;the different resistance values of RRAM were used to amplify and store the initial PUF deviation,thus improving its stability;the randomness between RRAM cycles was utilized to re-configure the fingerprint ID so as to improve its security.As for the fingerprint circuit of the re-configurable hybrid graphene RRAM PUF chip,a new PUF working mode was proposed:registration-reading-reconfiguration;this paper designed a new type PUF system consisted of initialization,deviation generation,deviation amplification and storage,deviation comparison and reading,and constructed a 64-bit re-configurable hybrid SRAM-RRAM PUF chip fingerprint circuit in 0.35μm CMOS technology.By analyzing and comparing the simulation results of the fingerprint circuit of the new PUF chip,the performance of the new PUF was measured from the perspectives of area power consumption,stability,randomness,and re-configuration.