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Paper 2020/1475

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

Kwangsu Lee

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 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
Preprint. MINOR revision.
Keywords
Identity-based encryptionKey revocationUpdate key delegationPublic 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
Creative Commons Attribution
CC BY
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