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Title:
Multi-Message Quantum Broadcast with Fine-Grained Access Control
Authors: Sayatan Ganguly, Shion Samadder Chaudhury
Abstract:Several subscription-based systems require fine-grained,
dynamic access control, which traditional broadcast
encryption schemes fail to handle efficiently. Attribute-based
and policy-based access structures offer a flexible and scalable
solution by encoding access rules directly into the encryption
mechanism. With the advent and development of quantum
networks, attribute-based and policy-based quantum broadcast
encryption (PBQBE) becomes necessary for enforcing such
controls securely in a post-quantum world. In this paper, we
present a general construction of quantum broadcast encryption
for multiple messages simultaneously, based on routing and
traversing a given attribute-based and, consequently, a policy-based
access tree when a user satisfies a unique policy. Our
scheme can handle dynamic systems with frequently changing
access patterns and can be deployed seamlessly with classical
systems. Compared to existing constructions, our scheme offers
hierarchical access, policy control, scalability, and revocation
while maintaining provable security guarantees.
ePrint: https://eprint.iacr.org/2025/1570
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