PROXY RE-ENCRYPTION BASED ON THE GENERALIZED EL GAMAL ENCRYPTION SCHEME
Keywords:
cryptography, proxy encryption, access delegation.DOI:
https://doi.org/10.17654/2277141723015Abstract
In 1998, Blaze et al. [10] presented proxy re-encryption as a cryptographic primitive in which a proxy transforms a ciphertext for Alice into one for Bob without seeing the corresponding plaintext and secret keys.
Ateniese et al. [4] proposed in 2005 a formal definition of unidirectional proxy re-encryption and its security guarantees. They build proxy re-encryption schemes based on El Gamal encryption scheme and bilinear pairing.
In this paper, we recall some proxy encryption notions and definitions and propose new unidirectional proxy schemes. Our proxy schemes are variants of Ateniese’s schemes based on the “lite” Cramer-Shoup encryption scheme and the generalized El Gamal encryption scheme.
Received: October 24, 2022;
Accepted: December 30, 2022;
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