Reconfigurable Physically Unclonable Function (PUF) Based Security

Tech ID: 28868 / UC Case 2018-088-0


The ubiquity of internet communication needs no introduction, and it follows that the security of the world’s 4.5 billion internet users is critical. Conventional cryptographic and “secret key” approaches are vulnerable to physical and side-channeling attacks, making them unreliable security measures. Therefore, a need exists for a more dependable and impenetrable form of security


Researchers at the University of California, Santa Barbara have developed an architecture for hardware-intrinsic security primitives that use random process-induced variations in subthreshold slope, leakage and tuning accuracy of Flash memories to build a reliable Physically Unclonable Function (PUF). This architecture allows for PUF circuits with fast and low power operation and low chip-area. The simple and low-cost design, small footprint, CMOS integration compatibility, and reconfigurability make this technology superior to existing PUF hardware and pitch-perfect for security applications.

A prototype of these RX-PUFs features enhanced functional performance with a measured bit error rate of 0.7% at room temperature and less than or equal to 5.3% at 100° C, without error correction methods. These hardware solutions have wide-ranging applications including IC identification, secure channel communication, and data encryption. In any case, none would require “key” storage in auxiliary memory, making it virtually impenetrable from attack.


  • Fast & low power operation (10 ns / 20 uW per bit)
  • CMOS compatible
  • Random & unpredictable primitives
  • Low chip-area overhead (scalable to 28nm+)
  • Programmable
  • Enhanced resilience against attack (including machine learning attacks)
  • Reconfigurable
  • Excellent physical characteristics (1600 F2/bit density and up to 41 fJ/bit energy efficiency)


  • Semiconductors
  • IC identification
  • Secure channel communication
  • Anti-counterfeiting
  • Military equipment
  • “Key-less” Data encryption
  • Data storage

Patent Status

Country Type Number Dated Case
United States Of America Issued Patent 10,812,084 10/20/2020 2018-088


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Other Information


Physically unclonable function, PUF, security, cryptographic, security primitives, RRAM, CMOS, semiconductors, IC identification, data encryption, indtelecom, indansens, indmicroelec, indsoftw

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