## Cryptology ePrint Archive: Report 2021/105

A New Efficient Identity-Based Encryption Without Pairing

Majid Salimi

Abstract: So far, most of the Identity-Based Encryption (IBE) schemes have been realized by employing bilinear pairings, lattices, trapdoor discrete logarithm, or based on the quadratic residue problem. Among the IBE schemes, only pairing-based methods seem to be practical. Previously published non-pairing-based schemes are generally inefficient in encryption, decryption, key generation, ciphertext size or key size. In this paper, we propose an IBE scheme based on a hybrid of Diffie-Hellman and RSA-like hardness assumption. The computational cost of the proposed scheme is lower than the previous schemes and the ciphertext size for an $l$-bit plaintext is only $2l$ bits. The proposed scheme is similar to the well-known ElGamal encryption algorithm; therefore it might be used in applications such as oblivious computation.

Category / Keywords: public-key cryptography / Identity-based encryption, Discrete logarithm problem, Trapdoor Decisional Diffie Hellman problem.

Date: received 27 Jan 2021, last revised 6 Feb 2021

Contact author: majidsalimi3 at gmail com

Available format(s): PDF | BibTeX Citation

Note: Submitted to Computer Standard & Interface

Short URL: ia.cr/2021/105

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