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SCB Mode: Semantically Secure Length-Preserving Encryption

Authors:
Fabio Banfi , Department of Computer Science, ETH Zurich, 8092 Zurich, Switzerland
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DOI: 10.46586/tosc.v2022.i4.1-23
URL: https://tosc.iacr.org/index.php/ToSC/article/view/9970
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Abstract: To achieve semantic security, symmetric encryption schemes classically require ciphertext expansion. In this paper we provide a means to achieve semantic security while preserving the length of messages at the cost of mildly sacrificing correctness. Concretely, we propose a new scheme that can be interpreted as a secure alternative to (or wrapper around) plain Electronic Codebook (ECB) mode of encryption, and for this reason we name it Secure Codebook (SCB). Our scheme is the first length-preserving encryption scheme to effectively achieve semantic security.
BibTeX
@article{tosc-2022-32697,
  title={SCB Mode: Semantically Secure Length-Preserving Encryption},
  journal={IACR Transactions on Symmetric Cryptology},
  publisher={Ruhr-Universität Bochum},
  volume={2022, Issue 4},
  pages={1-23},
  url={https://tosc.iacr.org/index.php/ToSC/article/view/9970},
  doi={10.46586/tosc.v2022.i4.1-23},
  author={Fabio Banfi},
  year=2022
}