Privacy protection type attribute matching method based on symmetrical encryption

Abstract

The invention relates to a privacy protection type attribute matching method based on symmetrical encryption. According to the method, a secret key is generated by means of common attributes naturally shared by matched users, an establish request and a secure channel secret key are connected through the secret key in an encryption mode, and only the matched users can generate the same secret key, decrypt a message conveniently and obtain a channel secret key; in this way, privacy protection type attribute matching and secure channel establishment are achieved synchronously through one round of communication, accurate and fuzzy matching / searching can be achieved, any privacy information can not be obtained by a participant with a similarity degree lower than the threshold value, an established secure channel can resist man-in-the-middle attack, and meanwhile, the attribute matching mechanism is verifiable so that matching result cheating attack can be resisted. Compared with most existing methods depending on an asymmetric encryption system and a trusted third party, the method has the advantages that calculation cost and communication cost are reduced greatly, calculated amount is small, practicality is high, flexibility is high, and the lightweight purpose is realized.

Description

technical field

[0001] The invention relates to a matching method, in particular to a privacy-protecting attribute matching method based on symmetric encryption, which belongs to the technical field of privacy protection. Background technique

[0002] Attributes are often used in information systems to label and search data objects or entities in the system. Attribute-based matching is used in various network systems, such as content distribution systems, information sharing systems, medical systems, and social networking systems. The basic mode is that the initiator gives the attribute description of the target object, and through the matching / search function of the system, the initiator returns the object whose attribute similarity with the described object exceeds a certain threshold. In many systems, the attribute is the privacy of the data owner, such as the illness and medical history of users in the medical system, personal information in social networks, etc. Recen...

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