Paper 2022/1702

SCB Mode: Semantically Secure Length-Preserving Encryption

Fabio Banfi, ETH Zurich
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.

Metadata
Available format(s)
PDF
Category
Secret-key cryptography
Publication info
Published by the IACR in TOSC 2022
DOI
10.46586/tosc.v2022.i4.1-23
Keywords
SCB secure codebook semantic security length-preserving encryption
Contact author(s)
fabio banfi @ inf ethz ch
History
2022-12-10: approved
2022-12-08: received
See all versions
Short URL
https://ia.cr/2022/1702
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2022/1702,
      author = {Fabio Banfi},
      title = {{SCB} Mode: Semantically Secure Length-Preserving Encryption},
      howpublished = {Cryptology {ePrint} Archive, Paper 2022/1702},
      year = {2022},
      doi = {10.46586/tosc.v2022.i4.1-23},
      url = {https://eprint.iacr.org/2022/1702}
}
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