Toward Secure and Timesaving Data Sharing: Cloud Encryption of RSA-co-ABE

Attribute-Based Encryption(ABE) has been a promising technology without authority sending keys in advance, depending on attributes to encrypt and decrypt. However, most of the existing Attribute-Based Encryption algorithms are time-consuming and complex. To address this issue, we apply the structure of the access tree to accomplish Attribute-Based Encryption. Combined the security of RSA with the convenience of Attribute-Based Encryption, we proposed cloud encryption of RSA-co-ABE algorithm, realize the safe and efficient encryption process on a cloud server. The findings of the security verification based on the game process between the challenger and the attacker reveal that the attacker cannot be identified if there is no polynomial time, and the polynomial time would demolish the security model in a non-negligible range. Finally, A lot of experiments proved that the RSA-co-ABE algorithm greatly saves time overhead, storage space and computing resources.