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Published in:
2011 | OriginalPaper | Chapter
Improved Meet-in-the-Middle Cryptanalysis of KTANTAN (Poster)
Authors : Lei Wei, Christian Rechberger, Jian Guo, Hongjun Wu, Huaxiong Wang, San Ling
Published in: Information Security and Privacy
Publisher: Springer Berlin Heidelberg
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This paper presents ongoing work towards extensions of meet-in-the-middle (MITM) attacks on block ciphers. Exploring developments in MITM attacks in hash analysis such as: (i) the
splice-and-cut
technique; (ii) the
indirect-partial-matching
technique. Our first contribution is that we show corrections to previous cryptanalysis and point out that the key schedule is more vulnerable to MITM attacks than previously reported. Secondly we further improve the time complexities of previous attacks with (i) and (ii), now the 80-bit secret key of the full rounds KTANTAN-{32,48,64} can be recovered at time complexity of 2
72.9
, 2
73.8
and 2
74.4
respectively, each requiring 4 chosen-plaintexts.