SCB Mode: Semantically Secure Length-Preserving Encryption
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Published:2022-12-07
Issue:
Volume:
Page:1-23
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ISSN:2519-173X
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Container-title:IACR Transactions on Symmetric Cryptology
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language:
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Short-container-title:ToSC
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.
Publisher
Universitatsbibliothek der Ruhr-Universitat Bochum
Subject
Applied Mathematics,Computational Mathematics,Computer Science Applications,Software