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Elastic-Tweak: A Framework for Short Tweak Tweakable Block Cipher

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conference contribution
posted on 2023-11-29, 18:18 authored by Avik Chakraborti, Nilanjan Datta, Ashwin Jha, Cuauhtemoc Mancillas-Lopez, Mridul Nandi, Yu Sasaki
Tweakable block cipher (TBC), a stronger notion than standard block ciphers, has wide-scale applications in symmetric-key schemes. At a high level, it provides flexibility in design and (possibly) better security bounds. In multi-keyed applications, a TBC with short tweak values can be used to replace multiple keys. However, the existing TBC construction frameworks, including TWEAKEY and XEX, are designed for general purpose tweak sizes. Specifically, they are not optimized for short tweaks, which might render them inefficient for certain resource constrained applications. So a dedicated paradigm to construct short-tweak TBCs (tBC) is highly desirable. In this paper, as a first contribution, we present a dedicated framework, called the Elastic-Tweak framework (ET in short), to convert any reasonably secure SPN block cipher into a secure tBC. We apply the ET framework on GIFT and AES to construct efficient tBCs, named TweGIFT and TweAES. These short-tweak TBCs have already been employed in recent NIST lightweight competition candidates, LOTUS-LOCUS and ESTATE. As our second contribution, we show some concrete applications of ET-based tBCs, which are better than their block cipher counterparts in terms of key size, state size, number of block cipher calls, and short message processing. Some notable applications include, Twe-FCBC (reduces the key size of FCBC and gives better security than CMAC), Twe-LightMAC Plus (better rate than LightMAC Plus), Twe-CLOC, and Twe-SILC (reduces the number of block cipher calls and simplifies the design of CLOC and SILC).

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Preferred Citation

Avik Chakraborti, Nilanjan Datta, Ashwin Jha, Cuauhtemoc Mancillas-Lopez, Mridul Nandi and Yu Sasaki. Elastic-Tweak: A Framework for Short Tweak Tweakable Block Cipher. In: International Conference on Cryptology in India (Indocrypt). 2021.

Primary Research Area

  • Algorithmic Foundations and Cryptography

Name of Conference

International Conference on Cryptology in India (Indocrypt)

Legacy Posted Date

2022-03-01

Open Access Type

  • Unknown

BibTeX

@inproceedings{cispa_all_3580, title = "Elastic-Tweak: A Framework for Short Tweak Tweakable Block Cipher", author = "Chakraborti, Avik and Datta, Nilanjan and Jha, Ashwin and Mancillas-Lopez, Cuauhtemoc and Nandi, Mridul and Sasaki, Yu", booktitle="{International Conference on Cryptology in India (Indocrypt)}", year="2021", }

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