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      Implementation of Ring-Oscillators-Based Physical Unclonable Functions with Independent Bits in the Response

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      International Journal of Reconfigurable Computing
      Hindawi Limited

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          Abstract

          The paper analyzes and proposes some enhancements of Ring-Oscillators-based Physical Unclonable Functions (PUFs). PUFs are used to extract a unique signature of an integrated circuit in order to authenticate a device and/or to generate a key. We show that designers of RO PUFs implemented in FPGAs need a precise control of placement and routing and an appropriate selection of ROs pairs to get independent bits in the PUF response. We provide a method to identify which comparisons are suitable when selecting pairs of ROs. Dealing with power consumption, we propose a simple improvement that reduces the consumption of the PUF published by Suh et al. in 2007 by up to 96.6%. Last but not least, we point out that ring oscillators significantly influence one another and can even be locked. This questions the reliability of the PUF and should be taken into account during the design.

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          Physical one-way functions.

          Modern cryptographic practice rests on the use of one-way functions, which are easy to evaluate but difficult to invert. Unfortunately, commonly used one-way functions are either based on unproven conjectures or have known vulnerabilities. We show that instead of relying on number theory, the mesoscopic physics of coherent transport through a disordered medium can be used to allocate and authenticate unique identifiers by physically reducing the medium's microstructure to a fixed-length string of binary digits. These physical one-way functions are inexpensive to fabricate, prohibitively difficult to duplicate, admit no compact mathematical representation, and are intrinsically tamper-resistant. We provide an authentication protocol based on the enormous address space that is a principal characteristic of physical one-way functions.
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            Extracting secret keys from integrated circuits

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              Improved Ring Oscillator PUF: An FPGA-friendly Secure Primitive

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                Author and article information

                Journal
                International Journal of Reconfigurable Computing
                International Journal of Reconfigurable Computing
                Hindawi Limited
                1687-7195
                1687-7209
                2012
                2012
                : 2012
                :
                : 1-13
                Article
                10.1155/2012/168961
                30e5d7f3-33ff-4fd7-829e-f57d68bbb651
                © 2012

                http://creativecommons.org/licenses/by/3.0/

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