Extracting secret keys from integrated circuits

Daihyun Lim, J.W. Lee, B. Gassend, G.E. Suh, M. van Dijk, S. Devadas
2005 IEEE Transactions on Very Large Scale Integration (vlsi) Systems  
Modern cryptographic protocols are based on the premise that only authorized participants can obtain secret keys and access to information systems. However, sophisticated tampering methods have been devised to extract secret keys stored in digital integrated circuits (ICs) from conditional access systems such as smartcards and ATMs. Arbiter-based Physical Unclonable Functions (PUFs) is proposed to exploit the statistical delay variation of wires and transistors across ICs in a manufacturing
more » ... ess to build unextractable secret keys. We fabricated arbiterbased PUFs in custom silicon and investigated the identification capability, reliability, and security of this scheme. Experimental results and theoretical studies show that a sufficient amount of inter-chip variation exists to enable each IC to be identified reliably and securely over a practical range of environmental variations such as temperature and power supply voltage. We show that arbiter-based PUFs are realizable and well-suited to build, for example, key-cards that need to be resistant to physical tampering attacks.
doi:10.1109/tvlsi.2005.859470 fatcat:i74zgxb5qnhzbcobb7ldklv6ey