Abstract
The 32-bit MAC of Grain-128a is a linear combination of the first 64 and then the alternative keystream bits. In this paper we describe a successful differential fault attack on Grain-128a, in which we recover the Secret Key by observing the correct and faulty MACs of certain chosen messages. The attack works due to certain properties of the Boolean functions and corresponding choices of the taps from the LFSR. We present methods to identify the fault locations and then construct a set of linear equations to obtain the contents of the LFSR and the NFSR. Our attack requires less than 211 fault injections and invocations of less than 212 MAC generation routines.
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Banik, S., Maitra, S., Sarkar, S. (2012). A Differential Fault Attack on Grain-128a Using MACs. In: Bogdanov, A., Sanadhya, S. (eds) Security, Privacy, and Applied Cryptography Engineering. SPACE 2012. Lecture Notes in Computer Science, vol 7644. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-34416-9_8
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DOI: https://doi.org/10.1007/978-3-642-34416-9_8
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