An encrypted image retrieval method supporting multiple keys

Abstract

The invention discloses an encrypted image retrieval method supporting multiple keys. The invention utilizes proxy re-encryption technology to convert different image encryption keys into the form that the inquiry user can decrypt with his private key, applies local sensitive hash algorithm to pre-classify the image set, improves the retrieval speed, and then encrypts the image feature vector withthe safe nearest neighbor algorithm to improve the retrieval precision. The invention supports a query user to query image sets from different encryption keys by using a query trap under a multi-keyscenario, and the user can only decrypt the query result by using a legal private key. The invention can protect data privacy and safety, and the cloud server cannot obtain any plaintext information from the ciphertext set, the index set and the ciphertext key set, nor can it obtain any plaintext information from the query trap. The invention is efficient and feasible in practical application.

Description

technical field [0001] The invention belongs to the field of multimedia information security, in particular to an encrypted image retrieval method supporting multiple keys. Background technique [0002] With the continuous upgrading of image devices such as digital cameras and smart phones, and the emergence of various image applications, image data has increased dramatically, greatly increasing the burden of local image data calculation and storage for users. Although the cloud outsourcing service can reduce the user's local image data calculation and storage burden, it will cause the user to be unable to actually control the data, resulting in security risks. Therefore, the user encrypts the image data and then stores it on the cloud server. Although encrypting images can guarantee the security of image data to a certain extent, it will lead to the fact that the traditional plaintext image retrieval technology cannot be directly implemented on ciphertext. [0003] Tradit...

AI Technical Summary

Problems solved by technology

[0004] Although encrypted image retrieval can be realized based on homomorphic encryption and searchable encryption technology, most of the current schemes only support single-key scenarios. If they are directly applied to actual multi-key scenarios, query users need to generate corresponding The trapdoor of the encryption key greatly increases the computational overhead on the client side

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