[Resource Topic] 2022/1702: SCB Mode: Semantically Secure Length-Preserving Encryption

Welcome to the resource topic for 2022/1702

Title:
SCB Mode: Semantically Secure Length-Preserving Encryption

Authors: Fabio Banfi

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.

ePrint: https://eprint.iacr.org/2022/1702

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