ATTRIBUTE BASED HYBRID ENCRYPTION IN CLOUD COMPUTING

Abstract

Cloud achieving access control and keeping data confidential, the data owners could adopt attribute-basedencryption to encrypt the stored data. Users with limited computing power are however more likely to delegatethe mask of the decryption task to the cloud servers to reduce the computing cost. During the delegation, thecloud servers could tamper or replace the delegated cipher text and respond a forged computing result withmalicious intent. Attribute-based encryption with delegation emerges. Since policy for general circuits enablesto achieve the strongest form of access control, a construction for realizing circuit cipher text-policy attributebased hybrid encryption with verifiable delegation has been considered in our work. A user is able to decrypt acipher text if the key’s attribute set satisfies the access structure associated with a cipher text. CP-ABEunder certain access policies. The users, who want to access the data files. They are most likely to outsource part of the decryption process to the cloud server. Designed the first ABE with outsourced decryption scheme toreduce the computation cost during decryption. Hybrid encryption with verifiable delegation. Confidentialitydata should not be leaked even if malware or hackers infiltrate server. Verifiability the unauthorized user without enough attributes could not access data