A Security-Mediated Encryption Scheme Based on ElGamal Variant

Boon Chian Tea, Muhammad Rezal Kamel Ariffin, Amir Hamzah Abd. Ghafar and Muhammad Asyraf Asbullah
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Boon Chian Tea: Institute for Mathematical Research (INSPEM), Universiti Putra Malaysia, Serdang 43400 UPM, Malaysia
Muhammad Rezal Kamel Ariffin: Institute for Mathematical Research (INSPEM), Universiti Putra Malaysia, Serdang 43400 UPM, Malaysia
Amir Hamzah Abd. Ghafar: Institute for Mathematical Research (INSPEM), Universiti Putra Malaysia, Serdang 43400 UPM, Malaysia
Muhammad Asyraf Asbullah: Institute for Mathematical Research (INSPEM), Universiti Putra Malaysia, Serdang 43400 UPM, Malaysia

Mathematics, 2021, vol. 9, issue 21, 1-11

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.

Keywords: computational diffie-hellman problem; EIGamal variant; encryption; fast revocation; pairing-free security mediated encryption scheme; security mediator (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2021
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