Server-Supported Decryption for Mobile Devices

Johanna Maria Kirss; Peeter Laud; Nikita Snetkov; Jelizaveta Vakarjuk

Paper 2023/039

Server-Supported Decryption for Mobile Devices

Johanna Maria Kirss, Cybernetica (Estonia), University of Tartu

Peeter Laud

, Cybernetica (Estonia)

Nikita Snetkov

, Cybernetica (Estonia), Tallinn University of Technology

Jelizaveta Vakarjuk

, Cybernetica (Estonia), Tallinn University of Technology

Abstract

We propose a threshold encryption scheme with two-party decryption, where one of the keyshares may be stored and used in a device that is able to provide only weak security for it. We state the security properties the scheme needs to have to support such use-cases, and construct a scheme with these properties.

Metadata

Available format(s): PDF
Category: Cryptographic protocols
Publication info: Published elsewhere. STM 2022
Keywords: ElGamal Threshold Decryption Offline guessing attacks Threshold Encryption Schemes
Contact author(s): johanna kirss @ cyber ee
peeter laud @ cyber ee
nikita snetkov @ cyber ee
jelizaveta vakarjuk @ cyber ee
History: 2023-01-19: approved; 2023-01-11: received; See all versions
Short URL: https://ia.cr/2023/039
License: CC BY-NC-ND

BibTeX

@misc{cryptoeprint:2023/039,
      author = {Johanna Maria Kirss and Peeter Laud and Nikita Snetkov and Jelizaveta Vakarjuk},
      title = {Server-Supported Decryption for Mobile Devices},
      howpublished = {Cryptology ePrint Archive, Paper 2023/039},
      year = {2023},
      note = {\url{https://eprint.iacr.org/2023/039}},
      url = {https://eprint.iacr.org/2023/039}
}