Multi-Input Functional Encryption for Unbounded Inner Products

Bishnu Charan Behera; Somindu C. Ramanna

Paper 2024/919

Multi-Input Functional Encryption for Unbounded Inner Products

Bishnu Charan Behera, Indian Institute of Technology Kharagpur

Somindu C. Ramanna, Indian Institute of Technology Kharagpur

Abstract

In this work, we propose a construction for $M u l t i I n p u t I n n e r P r o d u c t E n c r y p t i o n$ (MIPFE) that can handle vectors of variable length in different encryption slots. This construction is the first of its kind, as all existing MIPFE schemes allow only equal length vectors. The scheme is constructed in the private key setting, providing privacy for both message as well as the function, thereby achieving the so-called $f u l l - h i d i n g$ security. Our MIPFE scheme uses bilinear groups of prime order and achieves security under well studied cryptographic assumptions, namely, the symmetric external Diffie-Hellman assumption.

Note: This article is published in the 17th International Conference on Provable Security, ProvSec 2023, Wuhan, China

Metadata

Available format(s): PDF
Category: Cryptographic protocols
Publication info: Published elsewhere. Minor revision. 17th International Conference on Provable and Practical Security, ProvSec 2023
DOI: 10.1007/978-3-031-45513-1_15
Keywords: Functional encryption (FE)inner-product FE multi- input FE unbounded vectors
Contact author(s): bishnu_charan_behera @ iitkgp ac in
somindu @ cse iitkgp ac in
History: 2024-06-10: approved; 2024-06-09: received; See all versions
Short URL: https://ia.cr/2024/919
License: CC BY

BibTeX

@misc{cryptoeprint:2024/919,
      author = {Bishnu Charan Behera and Somindu C. Ramanna},
      title = {Multi-Input Functional Encryption for Unbounded Inner Products},
      howpublished = {Cryptology {ePrint} Archive, Paper 2024/919},
      year = {2024},
      doi = {10.1007/978-3-031-45513-1_15},
      url = {https://eprint.iacr.org/2024/919}
}