A resource-efficient secure data sharing method and system

Abstract

The invention provides a resource efficient security data sharing method and system. The method comprises the steps that an issuer preprocesses original data to obtain metadata M, wherein the metadataM is encrypted through utilization of a fog node symmetrical encryption scheme, a symmetrical key is protected by a set access structure, the accurate symmetrical key only can be obtained through decryption of a decryption server when an attribute set S of a subscriber satisfies the access structure corresponding to a target ciphertext, and further the metadata M is restored; the symmetrical keyand attributes are managed by an attribute authority; the access structure is an access tree gamma established by the issuer, non-leaf nodes of the access tree gamma are threshold gates, leaf nodes are associated with attribute values, and the access tree gamma comprises a left subtree gamma <c> and a right substree t <c>; the left subtree gamma <c> is determined by the issuer and corresponds to the ciphertext; and the right substree t <c> is the lead node for describing a time stamp. According to the method and the system, different security demands are realized, the computing cost is clearlyreduced, and the efficient user revocation is realized.

Description

technical field [0001] The present invention relates to the technical field of data encryption, in particular to a resource-efficient secure data sharing method and system. Background technique [0002] The development of IoT technology provides more and more application options for various industries. Taking the electronic medical system as an example, the system has large capacity, high speed, and a robust high-performance network provides a more stable network environment for various real-time applications carried in the electronic medical system, and the development of sensor technology provides mobility. Strong, easy-to-carry electronic medical terminal sensing equipment, this type of equipment can collect the patient's physiological health data in real time, making it possible to remotely obtain the patient's physiological health data in real time. However, while the application is more abundant, the privacy of the patient's physiological data cannot be ignored. The e...

AI Technical Summary

Problems solved by technology

Unfortunately, since the terminal sensor devices of electronic medical systems are often resource-constrained, they are mainly responsible for data collection and simple data preprocessing operations, and it is difficult to undertake expensive encryption operations. The existing attribute-based encryption scheme Directly deployed in the real-time application of electronic medical treatment will cause the terminal sensor to generate huge computing overhead, block the message, and the real-time performance of the application cannot be guaranteed, seriously affecting the system performance

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