Multi-Hop Fine-Grained Proxy Re-Encryption

ePrint Report: Multi-Hop Fine-Grained Proxy Re-Encryption

Yunxiao Zhou, Shengli Liu, Shuai Han

Proxy re-encryption (PRE) allows a proxy to transform a ciphertext intended for Alice (delegator) to another ciphertext intended for Bob (delegatee) without revealing the underlying message. Recently, a new variant of PRE, namely fine-grained PRE (FPRE), was proposed in [Zhou et al., Asiacrypt 2023]. Generally, FPRE is designed for a function family F: each re-encryption key rk_{A→B}^f is associated with a function f ∈ F, and with rk_{A→B}^f, …

alice asiacrypt ciphertext encryption eprint report message proxy report transform