A Secure and Efficient Data Sharing Scheme with Outsourced Signcryption and Decryption in Mobile Cloud Computing
Somchart Fugkeaw · 2021
This paper proposes a cryptographic-based access control that supports secure and efficient signcryption and decryption feature for data owners and data users in mobile cloud environment. At a core construct of our proposed scheme, a dual encryption based on AES encryption and ciphertext policy attribute-based encryption (CP-ABE) and dual proxy model are integrated. In our model, data owners can encrypt and digitally sign a file by using AES key and their private key stored in the mobile devices respectively. The hash value calculation and CP-ABE encryption are outsourced to the delegated proxy called signcryption proxy. In the similar way, data users can use their mobile devices to decrypt the ciphertext encrypted by the AES key while the computing task of CP-ABE decryption is outsourced to another proxy called decryption proxy. Therefore, most extensive costs for digital signing, encryption, and decryption are offloaded to the proxies located in the cloud. This renders the confidentiality, authenticity, and non-repudiation along with the fine-grained access control for mobile cloud environment where both data owners and data users can use the mobile devices to share and access the data via cloud platform. In addition, we conducted performance evaluation to substantiate that our proposed scheme is efficient in practice.