zk-Guard-R: Policy-Hidden and Replay-Safe zk-SNARK Access Control for IoT Sensor Data Stored on IPFS
IoT sensor deployments increasingly export measurement streams to edge gateways and content-addressed storage such as IPFS, but access control decisions must be enforced without disclosing sensor owner policies, requester attributes, or stale data versions. Existing blockchain, CP-ABE, and zero-knowledge approaches red...