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Practical aspects of quantization and tamper-sensitivity for physically obfuscated keys

: Immler, V.; Hennig, M.; Kürzinger, L.; Sigl, G.


Association for Computing Machinery -ACM-:
CS2 2016, Third Workshop on Cryptography and Security in Computing Systems : Prague, Czech Republic, January 20, 2016
New York: ACM, 2016
ISBN: 978-1-4503-4065-6
Workshop on Cryptography and Security in Computing Systems (CS2) <3, 2016, Prague>
Fraunhofer AISEC ()

This work deals with key generation based on Physically Obfuscated Keys (POKs), i.e., a certain type of tamperevident Physical Unclonable Function (PUF) that can be used as protection against invasive physical attacks. To design a protected device, one must take attacks such as probing of data lines or penetration of the physical security boundary into consideration. For the implementation of a POK as a countermeasure, physical properties of a material - which covers all parts to be protected - are measured. After measuring these properties, i.e. analog values, they have to be quantized in order to derive a cryptographic key. This paper will present and discuss the impact of the quantization method with regard to three parameters: key quality, tamper-sensitivity, and reliability. Our contribution is the analysis of two different quantization schemes considering these parameters. Foremost, we propose a new approach to achieve improved tampersensitivity in the worst-case with no information leakage.