Multiset-Algebraic Cryptanalysis of Reduced Kuznyechik, Khazad, and secret SPNs
We devise the first closed formula for the number of rounds of a blockcipher with secret components so that these components can be revealed using multiset, algebraic-degree, or division-integral properties, which in this case are equivalent. Using the new result, we attack 7 (out of 9) rounds of Ku...
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Published in | IACR Transactions on Symmetric Cryptology pp. 226 - 247 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Ruhr-Universität Bochum
01.02.2017
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Subjects | |
Online Access | Get full text |
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Summary: | We devise the first closed formula for the number of rounds of a blockcipher with secret components so that these components can be revealed using multiset, algebraic-degree, or division-integral properties, which in this case are equivalent. Using the new result, we attack 7 (out of 9) rounds of Kuznyechik, the recent Russian blockcipher standard, thus halving its security margin. With the same technique we attack 6 (out of 8) rounds of Khazad, the legacy 64-bit blockcipher. Finally, we show how to cryptanalyze and find a decomposition of generic SPN construction for which the inner-components are secret. All the attacks are the best to date. |
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ISSN: | 2519-173X |
DOI: | 10.13154/tosc.v2016.i2.226-247 |