A Collaborative Key Management Protocol in Ciphertext Policy Attribute-Based Encryption for Cloud Data Sharing

Abstract: Cryptography based on ciphertext policy attributes (CPABE) is a promising cryptographic method that can be used to fine-tune access to outsourced knowledge in the cloud. However, flaws in key management make your application difficult to detect. A central theme in the written agreement. Please note that buyers’ front-end devices (such as smartphones) often have limited data protection. Therefore, if it is completely controlled by a non-public key, consumers may leak a key that is almost unrecognizable, but initially in the previous version. explore. Use ABE wisely. In the course of this work, we proposed the collaborative key management protocol in CPABE (CKMCPABE). Our design performs the distributed generation, release and storage of private keys without adding additional infrastructure. When the key is updated, immediate and detailed attribute revocation is provided. The cooperation mechanism not only effectively solves the core problem of the written agreement, but also effectively solves the problem of key leakage. At the same time, it helps to significantly reduce the workload of consumer decryption. A comparison with various representative CPABE themes shows that our model performs slightly better in terms of external knowledge sharing in the mobile device cloud. Finally, we provide proof of security for the proposed protocol. Index terms: cloud data exchange, CPABE, key management, security, efficiency.