Delegate and Verify the Update Keys of Revocable Identity-Based Encryption

Kwangsu Lee

Paper 2020/1475

Delegate and Verify the Update Keys of Revocable Identity-Based Encryption

Kwangsu Lee, Sejong University

Abstract

Revocable identity-based encryption (RIBE) is an extension of identity-based encryption (IBE) and it supports efficient revocation of private keys. In the past, many efficient RIBE schemes have been proposed, but research on efficiently delegating the generation of update keys to a cloud server is somewhat insufficient. In this paper, we newly introduce the concept of delegated RIBE (DRIBE) that can delegate the generation of update keys to the semi-trusted cloud server and define the security models of DRIBE. Next, we propose a DRIBE scheme by generically combining a hierarchical IBE (HIBE) scheme, an identity-based broadcast encryption (IBBE) scheme, and a collision-resistant hash function. In addition, we propose a DRIBE-INC scheme that generates an occasional base update key and a periodic incremental update key to reduce the size of the update key in our DRIBE scheme.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Published elsewhere. IEEE Access
DOI: 10.1109/ACCESS.2023.3280253
Keywords: Identity-based encryption Key revocation Update key delegation Public Verifiability
Contact author(s): kwangsu @ sejong ac kr
History: 2023-06-01: last of 2 revisions; 2020-11-24: received; See all versions
Short URL: https://ia.cr/2020/1475
License: CC BY

BibTeX

@misc{cryptoeprint:2020/1475,
      author = {Kwangsu Lee},
      title = {Delegate and Verify the Update Keys of Revocable Identity-Based Encryption},
      howpublished = {Cryptology {ePrint} Archive, Paper 2020/1475},
      year = {2020},
      doi = {10.1109/ACCESS.2023.3280253},
      url = {https://eprint.iacr.org/2020/1475}
}