Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/141805
Title: TNT : how to tweak a block cipher
Authors: Bao, Zhenzhen
Guo, Chun
Guo, Jian
Song, Ling
Keywords: Science::Mathematics
Issue Date: 2020
Source: Bao, Z., Guo, C., Guo, J., & Song, L. (2020). TNT : how to tweak a block cipher. Proceedings of 39th Annual International Conference on the Theory and Applications of Cryptographic Techniques (EUROCRYPT 2020), 641-673. doi:10.1007/978-3-030-45724-2_22
Abstract: In this paper, we propose Tweak-aNd-Tweak (𝖳𝖭𝖳 for short) mode, which builds a tweakable block cipher from three independent block ciphers. 𝖳𝖭𝖳 handles the tweak input by simply XOR-ing the unmodified tweak into the internal state of block ciphers twice. Due to its simplicity, 𝖳𝖭𝖳 can also be viewed as a way of turning a block cipher into a tweakable block cipher by dividing the block cipher into three chunks, and adding the tweak at the two cutting points only. 𝖳𝖭𝖳 is proven to be of beyond-birthday-bound 22𝑛/3 security, under the assumption that the three chunks are independent secure n-bit SPRPs. It clearly brings minimum possible overhead to both software and hardware implementations. To demonstrate this, an instantiation named TNT-AES with 6, 6, 6 rounds of AES as the underlying block ciphers is proposed. Besides the inherent proven security bound and tweak-independent rekeying feature of the 𝖳𝖭𝖳 mode, the performance of TNT-AES is comparable with all existing TBCs designed through modular methods.
URI: https://hdl.handle.net/10356/141805
ISBN: 978-3-030-45723-5
DOI: 10.1007/978-3-030-45724-2_22
Rights: Β© 2020 International Association for Cryptologic Research. All rights reserved. This paper was published by Springer in Proceedings of 39th Annual International Conference on the Theory and Applications of Cryptographic Techniques (EUROCRYPT 2020) and is made available with permission of International Association for Cryptologic Research.
Fulltext Permission: embargo_20210508
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Conference Papers

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