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POEx: A beyond-birthday-bound-secure on-line cipher

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Abstract

On-line ciphers are convenient building blocks for realizing efficient single- pass encryption. In particular, the trend to limit the consequences of nonce reuses rendered them popular in recent authenticated encryption schemes. While encryption schemes, such as POE, COPE, or the ciphers within ElmE/ElmD concentrated on efficiency, their security guarantees and that of all earlier on-line ciphers is limited by the birthday bound, and so are those of the AE schemes built upon them. This work proposes POEx, a beyond-birthday-bound-secure on-line cipher which employs one call to a tweakable block cipher and one call to a 2n-bit universal hash function per message block. POEx builds upon the recently proposed XTX tweak extender by Iwata and Minematsu. We prove the security of our construction and discuss possible instantiations.

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Notes

  1. For example, the OpenSSL EVP_DecryptUpdate interface [34].

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Acknowledgements

The authors would like to thank the anonymous reviewers of the ArcticCrypt 2016 and of the journal for Cryptography and Communications for their very helpful comments and suggestions. We would thank in particular Mridul Nandi and Ashwin Jha for pointing out that subsequent inputs to the hash function are dependent, which helped to improve our work.

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Authors and Affiliations

  1. Beuth Hochschule für Technik Berlin, Berlin, Germany

    Christian Forler

  2. Bauhaus-Universität Weimar, Weimar, Germany

    Eik List, Stefan Lucks & Jakob Wenzel

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  1. Christian Forler
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  2. Eik List
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  3. Stefan Lucks
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  4. Jakob Wenzel
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Correspondence to Eik List.

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This article is part of the Topical Collection on Recent Trends in Cryptography

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Forler, C., List, E., Lucks, S. et al. POEx: A beyond-birthday-bound-secure on-line cipher. Cryptogr. Commun. 10, 177–193 (2018). https://doi.org/10.1007/s12095-017-0250-9

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