Welcome to the resource topic for 2015/428
Title:
Dumb Crypto in Smart Grids: Practical Cryptanalysis of the Open Smart Grid Protocol
Authors: Philipp Jovanovic, Samuel Neves
Abstract:This paper analyses the cryptography used in the Open Smart Grid Protocol (OSGP). The authenticated encryption (AE) scheme deployed by OSGP is a non-standard composition of RC4 and a home-brewed MAC, the ``OMA digest’'. We present several practical key-recovery attacks against the OMA digest. The first and basic variant can achieve this with a mere 13 queries to an OMA digest oracle and negligible time complexity. A more sophisticated version breaks the OMA digest with only 4 queries and a time complexity of about 2^{25} simple operations. A different approach only requires one arbitrary valid plaintext-tag pair, and recovers the key in an average of 144 \emph{message verification} queries, or one ciphertext-tag pair and 168 \emph{ciphertext verification} queries. Since the encryption key is derived from the key used by the OMA digest, our attacks break both confidentiality and authenticity of OSGP.
ePrint: https://eprint.iacr.org/2015/428
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