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A Security-Mediated Encryption Scheme Based on ElGamal Variant

Author

Listed:
  • Boon Chian Tea

    (Institute for Mathematical Research (INSPEM), Universiti Putra Malaysia, Serdang 43400 UPM, Malaysia
    These authors contributed equally to this work.)

  • Muhammad Rezal Kamel Ariffin

    (Institute for Mathematical Research (INSPEM), Universiti Putra Malaysia, Serdang 43400 UPM, Malaysia
    These authors contributed equally to this work.)

  • Amir Hamzah Abd. Ghafar

    (Institute for Mathematical Research (INSPEM), Universiti Putra Malaysia, Serdang 43400 UPM, Malaysia
    Department of Mathematics and Statistics, Faculty of Science, Universiti Putra Malaysia, Serdang 43400 UPM, Malaysia
    These authors contributed equally to this work.)

  • Muhammad Asyraf Asbullah

    (Institute for Mathematical Research (INSPEM), Universiti Putra Malaysia, Serdang 43400 UPM, Malaysia
    Centre of Foundation Studies for Agricultural Science, Universiti Putra Malaysia, Serdang 43400 UPM, Malaysia
    These authors contributed equally to this work.)

Abstract

Boneh et al. introduced mediated RSA (mRSA) in 2001 in an attempt to achieve faster key revocation for medium-sized organizations via the involvement of a security mediator (SEM) as a semi-trusted third party to provide partial ciphertext decryption for the receiver. In this paper, a pairing-free security mediated encryption scheme based on an ElGamal variant is proposed. The scheme features a similar setting as in the mediated RSA but with a different underlying primitive. We show that the proposed security mediated encryption scheme is secure indistinguishably against chosen-ciphertext attack (IND-CCA) in the random oracle via the hardness assumption of the computational Diffie-Hellman (CDH) problem.

Suggested Citation

  • Boon Chian Tea & Muhammad Rezal Kamel Ariffin & Amir Hamzah Abd. Ghafar & Muhammad Asyraf Asbullah, 2021. "A Security-Mediated Encryption Scheme Based on ElGamal Variant," Mathematics, MDPI, vol. 9(21), pages 1-11, October.
    • Handle: RePEc:gam:jmathe:v:9:y:2021:i:21:p:2642-:d:660299
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