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Title:
Conditional Attribute-Based Proxy Re-Encryption and Its Instantiation
Authors: Lisha Yao, Jian Weng, Bimei Wang
Abstract:In attribute-based proxy re-encryption (AB-PRE) and attribute-based conditional proxy re-encryption (AB-CPRE) systems, the proxy transforms a ciphertext associated with policy f to a ciphertext associated with policy g or transforms a ciphertext for delegator satisfying a fine-grained condition to a ciphertext for delegatee. However, such PRE schemes have found many practical applications requiring fine-grained access control while keeping flexible delegation. Unfortunately, the existing PRE schemes are impossible to handle simultaneously with the above scenarios. In this work, we introduce the notion of conditional attribute-based proxy re-encryption (CAB-PRE), which enables a proxy only to transform a ciphertext associated with policy f meeting the special delegation requirements by delegator to a ciphertext associated with policy g. We formalize its honestly re-encryption attacks (HRA) security model that implies CPA-secure, giving a concrete CAB-PRE scheme based on learning with errors (LWE) assumption. Finally, we show that CAB-PRE implies AB-PRE and AB-CPRE notions, and propose their constructions.
ePrint: https://eprint.iacr.org/2022/637
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