Attribute encryption method supporting efficient data deduplication and attribute revocation in cloud storage

Abstract

The invention belongs to the technical field of cloud computing and information security. The invention discloses an attribute encryption method supporting efficient data deduplication and attribute revocation in cloud storage. According to the method, attribute authority is introduced between a cloud server and a data owner; the attribute authority finds out a specific prime number correspondingto the outsourcing data label through mapping, and the cloud server can judge whether corresponding outsourcing data exists in the cloud or not only by performing simple division operation on the prime number, so that the problem of low repeated data searching efficiency in the current duplicate removal scheme is solved; according to the method, private cloud is required to complete ciphertext updating according to an updating key issued by attribute authority, so that the problem that an unauthorized user cannot be revoked in a current duplicate removal scheme is solved; in addition, the method supports a ciphertext outsourcing decryption function, and the calculation burden of a user is reduced.

Description

technical field [0001] The invention belongs to the technical field of cloud computing and information security, and in particular relates to an attribute encryption method supporting efficient data deduplication and attribute revocation in cloud storage. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: With the rapid development of the Internet, cloud computing has brought great changes to various fields of society. More and more enterprises or individuals like to rely on cloud computing to enjoy high-quality services, such as data storage, data sharing and outsourced computing. For data privacy, data owners encrypt sensitive data. However, traditional cryptographic primitives are not compatible with fine-grained data sharing. For example, the data owner wants multiple clients to access the data, encrypt the data with the recipient's public key and then outsource it to the cloud server. The user receives th...

AI Technical Summary

Problems solved by technology

[0006] (1) The existing de-duplication method supports inefficient search for duplicate data, resulting in long service delays

[0007] (2) Due to their specific structures, the existing methods cannot be compatible with the two functions of data deduplication and attribute revocation

[0010] 2. In commercial cloud storage, data privacy is an important issue. However, existing related technologies only support data deduplication or attribute revocation, and in the attribute encryption method that supports deduplication, if a user leaves the system or the password If the key is lost, it will bring great challenges to the data security in the system.

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