Attribute-based ciphertext searching system and method in support of proxy re-encryption

Abstract

The invention discloses an attribute-based ciphertext searching system and method in support of proxy re-encryption. According to the method, two functions that a user securely carries out searching and effectively shares searching authority in a cloud environment are realized at the same time. According to the method, through adoption of an LSSS linear secret sharing scheme, an attribute of an access user can be described in fine granularity, and the relatively high computing efficiency is achieved. In a threshold generation phase, a blind technology is carried out on a user key through utilization of a random value, and then the user key is submitted to a cloud server, so the confidentiality and security of the user key are ensured. A searching authority entrusting problem when an authorization user is offline in practical application is taken into consideration. A proxy re-encryption technology is imported, and the cloud server converts a ciphertext, so the encryption / decryption pressure of a data owner is migrated, and the system efficiency is greatly improved.

Description

technical field [0001] The invention relates to an attribute-based ciphertext retrieval system and method supporting proxy re-encryption, and belongs to the technical field of cloud computing. Background technique [0002] Cloud computing is a new topic in the field of information technology, and it is the further development of parallel computing, distributed computing and grid computing. Cloud storage is an important service of cloud computing, which allows data owners to store their data on the cloud, and cloud servers provide round-the-clock data access to users. Ordinary users only need a terminal, a smart phone or a tablet connected to the Internet to access the data in the cloud server anytime and anywhere. For enterprise users, especially small and medium-sized enterprises with limited funds, cloud computing enables them to obtain flexible on-demand services without having to purchase expensive hardware platforms, thereby reducing costs. Although cloud services bri...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem that the search authority cannot be effectively granted in the attribute-based searchable encryption scheme in the cloud computing environment, the present invention provides an attribute-based ciphertext retrieval system and method that supports proxy re-encryption in cloud computing

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