SCB Mode: Semantically Secure Length-Preserving Encryption

Authors

  • Fabio Banfi Department of Computer Science, ETH Zurich, 8092 Zurich, Switzerland

DOI:

https://doi.org/10.46586/tosc.v2022.i4.1-23

Keywords:

SCB, secure codebook, semantic security, length-preserving encryption

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.

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Published

2022-12-07

Issue

Section

Articles

How to Cite

SCB Mode: Semantically Secure Length-Preserving Encryption. (2022). IACR Transactions on Symmetric Cryptology, 2022(4), 1-23. https://doi.org/10.46586/tosc.v2022.i4.1-23