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Fast Decryption: a New Feature of Misuse-Resistant AE

Authors:
Kazuhiko Minematsu , NEC, Kawasaki, Japan
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DOI: 10.13154/tosc.v2020.i3.87-118
URL: https://tosc.iacr.org/index.php/ToSC/article/view/8697
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Abstract: Misuse-resistant AE (MRAE) is a class of authenticated encryption (AE) that has a resistance against a potential misuse (repeat) of nonce. MRAE has received significant attention from the initial proposal by Rogaway and Shrimpton. They showed a generic MRAE construction called SIV. SIV becomes a de-facto scheme for MRAE, however, one notable drawback is its two-pass operation for both encryption and decryption. This implies that MRAE built on SIV is slower than the integrated nonce-based AE schemes, such as OCB.In this paper, we propose a new method to improve this situation. Particularly, our MRAE proposal (decryption-fast SIV or DFV) allows to decrypt as fast as a plain decryption, hence theoretically doubles its speed from the original SIV, while keeping the encryption speed equivalent to SIV. We present several generic compositions for DFV and their instantiations.
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BibTeX
@article{tosc-2020-30565,
  title={Fast Decryption: a New Feature of Misuse-Resistant AE},
  journal={IACR Transactions on Symmetric Cryptology},
  publisher={Ruhr-Universit├Ąt Bochum},
  volume={2020, Issue 3},
  pages={87-118},
  url={https://tosc.iacr.org/index.php/ToSC/article/view/8697},
  doi={10.13154/tosc.v2020.i3.87-118},
  author={Kazuhiko Minematsu},
  year=2020
}