A CP-ABE method base on reused sub-policy
Qingqing Huang · 2022
In recent years, with the widely used of cloud computing, the security of network for data is more and more important. Traditional symmetric encryption requires both parties to hold the same encryption and decryption keys, which is not suitable for cloud computing environment. Asymmetric encryption also requires that each user and the system have an unique public-private key pair, making the key generation and holding costs are too high. So Ciphertext Policy Attribute-Based Encryption scheme comes in handy. After the attribute mechanism generates a public key and a master private key, it only needs to assign a set of private keys according to the attributes for each user, reducing the cost of key pairs. However, with the increase of user data, it takes more and more time for the data owner to encrypt data. How to accelerate the encryption speed also becomes the key to optimize the system. Combined with relevant research, this paper proposes an encryption scheme based on the multiplexing sub-strategy. On the basis of ensuring the original security, it optimizes the speed of multiple encryption schemes with the same sub-strategy that need to be encrypted simultaneously for the data owner, which greatly improves the computing speed.