dAPRE:Efficient and Reliable Attribute-Based Proxy Re-Encryption Using DAG for Data Sharing in IoT

The explosive growth of the Internet of Things (IoT) data and its analytical applications can bring convenience to better intelligent life, efficient work and other aspects. However, the secure sharing of IoT data is the biggest obstacle to this convenience. Numerous schemes have been developed to address the security challenges associated with IoT data sharing recently, but the existing schemes still face the challenge of how to achieve effective fine-grained access control and low overhead in IoT data security sharing. To tackle this challenge, we propose an efficient and reliable attribute-based proxy re-encryption scheme using Directed Acyclic Graph (DAG), namely dAPRE. In the phase of encryption, re-encryption and delegator decryption, dAPRE remains constant computation overhead with the increasing number of attributes. At the same time, dAPRE's attribute-based verifiable ciphertext access mechanism and DAG-based key recovery algorithm realize ciphertext integrity check and ensure key security. Furthermore, dAPRE has been evaluated through both theoretical analysis and practical experiments, demonstrating its efficiency and practicality.