A Deniably Authenticated Searchable Public Key Encryption Scheme in Mobile Electronic Mail System

Shuhan Zeng; Yongjian Liao; Chuanhao Zhou; Jinlin He; Hongwei Wang

Paper 2024/394

A Deniably Authenticated Searchable Public Key Encryption Scheme in Mobile Electronic Mail System

Shuhan Zeng

, University of Electronic Science and Technology of China

Yongjian Liao

, University of Electronic Science and Technology of China

Chuanhao Zhou

Jinlin He, University of Electronic Science and Technology of China

Hongwei Wang, University of Electronic Science and Technology of China

Abstract

Confidentiality and authentication are two main security goals in secure electronic mail (e-mail). Furthermore, deniability is also a significant security property for some e-mail applications to protect the privacy of the sender. Although searchable encryption solves the keyword searching problem in a secure e-mail system, it also breaks the deniability of the system. Because the adversary can obtain the information of the data sender and data user from the trapdoor as well as ciphertext used for keyword searching. At the same time, efficiency is another problem in mobile computing. To overcome the issues, we put forward deniably authenticated searchable public key encryption (DA-SPKE) which can apply to the deniable e-mail system. We first define the DA-SPKE model and propose the DA-SPKE scheme. Then we prove its security in the random oracle model and evaluate its efficiency. Finally, we use it in a deniably secure e-mail system to protect both data senders’ and data users' privacy.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Preprint.
Keywords: Searchable public key encryption Deniability Authentication E-mail Keyword guessing attack Chosen keyword attack
Contact author(s): shuhanzeng @ gmail com
liaoyj @ uestc edu cn
History: 2024-03-05: approved; 2024-03-04: received; See all versions
Short URL: https://ia.cr/2024/394
License: CC BY

BibTeX

@misc{cryptoeprint:2024/394,
      author = {Shuhan Zeng and Yongjian Liao and Chuanhao Zhou and Jinlin He and Hongwei Wang},
      title = {A Deniably Authenticated Searchable Public Key Encryption Scheme in Mobile Electronic Mail System},
      howpublished = {Cryptology ePrint Archive, Paper 2024/394},
      year = {2024},
      note = {\url{https://eprint.iacr.org/2024/394}},
      url = {https://eprint.iacr.org/2024/394}
}