IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Special Section on VLSI Design and CAD Algorithms
Scan-Based Attack on AES through Round Registers and Its Countermeasure
Youhua SHINozomu TOGAWAMasao YANAGISAWA
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Volume E95.A (2012) Issue 12 Pages 2338-2346

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Abstract

Scan-based side channel attack on hardware implementations of cryptographic algorithms has shown its great security threat. Unlike existing scan-based attacks, in our work we observed that instead of the secret-related-registers, some non-secret registers also carry the potential of being misused to help a hacker to retrieve secret keys. In this paper, we first present a scan-based side channel attack method on AES by making use of the round counter registers, which are not paid attention to in previous works, to show the potential security threat in designs with scan chains. And then we discussed the issues of secure DFT requirements and proposed a secure scan scheme to preserve all the advantages and simplicities of traditional scan test, while significantly improve the security with ignorable design overhead, for crypto hardware implementations.

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© 2012 The Institute of Electronics, Information and Communication Engineers
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