Publication Type

Journal Article

Version

publishedVersion

Publication Date

3-2025

Abstract

Selective opening security ensures that, when an adversary is given multiple ciphertexts and corrupts a subset of the senders (thereby obtaining the plaintexts and the senders’ randomness), the privacy of the remaining ciphertexts is still preserved. Previous selective opening secure IBE schemes encrypt messages bit-by-bit, or only achieve selective-id security. In this paper, we present the first adaptive-id, selective opening secure identity-based encryption (IBE) tightly from LWE. To achieve this, we introduce a new primitive called delegatable all-but-many lossy trapdoor functions (DABM-LTDF) and provide a generic construction that converts DABM-LTDF into an adaptive-id, selective opening secure IBE through a tight security reduction. Finally, we construct a concrete DABM-LTDF from the LWE assumption, resulting in the first adaptive-id, selective opening secure IBE from LWE.

Keywords

selective opening security, identity-based encryption, adaptive-ID security, learning with errors

Discipline

Information Security

Research Areas

Information Systems and Management

Areas of Excellence

Digital transformation

Publication

Designs, Codes and Cryptography

Volume

93

Issue

5

First Page

1425

Last Page

1449

ISSN

0925-1022

Identifier

10.1007/s10623-024-01560-1

Publisher

Springer

Additional URL

https://doi.org/10.1007/s10623-024-01560-1

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