M-Sel: A Message Selection Functional Encryption from Simple Tool

Ahmad Khoureich Ka

Paper 2024/1958

M-Sel: A Message Selection Functional Encryption from Simple Tool

Ahmad Khoureich Ka

, Université Alioune Diop de Bambey, Senegal

Abstract

In this paper, we put forward a new practical application of Inner-Product Functional Encryption (IPFE) that we call Message Selection functional encryption (M-Sel) which allows users to decrypt selected portions of a ciphertext. In a message selection functional encryption scheme, the plaintext is partitioned into a set of messages M = {m1, . . . , mt}. The encryption of M consists in encrypting each of its elements using distinct encryption keys. A user with a functional decryption key skx derived from a selection vector x can access a subset of M from the encryption thereof and nothing more. Our construction is generic and combines a symmetric encryption scheme and an inner product functional encryption scheme, therefore, its security is tied to theirs. By instantiating our generic construction from a DDH-based IPFE we obtain a message selection FE with constant-size decryption keys suitable for key storage in lightweight devices in the context of Internet of Things (IoT).

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Published elsewhere. SecITC 2023
DOI: 10.1007/978-3-031-52947-4_7
Keywords: Functional Encryption Inner-Product Functional Encryption Adaptive Security.
Contact author(s): ahmadkhoureich ka @ uadb edu sn
History: 2024-12-06: approved; 2024-12-03: received; See all versions
Short URL: https://ia.cr/2024/1958
License: CC BY

BibTeX

@misc{cryptoeprint:2024/1958,
      author = {Ahmad Khoureich Ka},
      title = {M-Sel: A Message Selection Functional Encryption from Simple Tool},
      howpublished = {Cryptology {ePrint} Archive, Paper 2024/1958},
      year = {2024},
      doi = {10.1007/978-3-031-52947-4_7},
      url = {https://eprint.iacr.org/2024/1958}
}