Searchable encryption method based on wildcard identity

Abstract

The invention discloses a wildcard identity-based searchable encryption method, which comprises the following steps that: a key generation center sets public parameters, allocates a private key to a cloud server and stores a main private key; the user derives a private key of the user identity with the hierarchical depth of YES according to the user identity with the hierarchical depth of YES and the private key of the user identity with the hierarchical depth of YES; the data owner selects a keyword, generates a security index corresponding to the keyword by using the public parameter, the wildcard character identity mode and the identity of the cloud server, and sends the security index to the cloud server; the user uses the private key of the user identity to generate a search trap door and sends the search trap door to the cloud server; and the cloud server executes a search test according to the private key of the cloud server, the search trap door and the security index, and returns the ciphertext of the sensitive data file corresponding to the keyword to the user if the test is successful. According to the method, the trusted private key generator can generate the private key according to the wildcard identity, so that complex certificate management is eliminated.

Description

technical field [0001] The invention relates to the field of cloud storage system data security and privacy protection, in particular to a searchable encryption method based on wildcard identity. Background technique [0002] With the development of wireless communication, Internet of Things, and artificial intelligence technologies, massive amounts of user data are being generated all the time. With cloud storage services, users can remotely upload their massive data to the cloud and flexibly access it anytime, anywhere via the Internet, and such services eliminate the need for local storage management and maintenance. Although the cloud brings great advantages in maintaining massive amounts of data, concurrent security and privacy issues may hinder users from enjoying cloud storage and computing services. It is widely believed that data confidentiality is one of the most important security issues, in fact, from the user's point of view, the content of some outsourced data...

AI Technical Summary

Problems solved by technology

On the one hand, complex quantum computing technology will endanger the cryptographic schemes designed based on the assumption of traditional cryptographic difficulty; recent breakthrough research results show that quantum computers are likely to be realized in the near future, leading to the need for post-quantum security based on keyword search. Public key encryption is more demanding

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