| In recent years,with the widespread application of smart devices and digital images,the number of images has increased significantly,and the storage and computing requirements of users for retrieving images from large-scale images have gradually increased.In order to reduce local storage costs and computing resource consumption,users upload images to a cloud server and perform image retrieval in a cloud environment.For this reason,domestic and foreign researchers have proposed many image retrieval schemes in the cloud environment.Unlike traditional image retrieval,image retrieval in a cloud environment requires the use of encryption algorithms to protect image information.Among them,Asymmetric Scalar-Product-Preserving Encryption(ASPE)is widely used due to its low computational complexity.However,there are still some problems with the content-based image retrieval scheme in the cloud environment that uses the encryption algorithm to protect the image information: firstly,the index establishment is completed by the image owner,which causes huge computational pressure on users with limited resources;secondly,the image owner needs to change The secret key is shared with the inquiring user to generate a security trapdoor,which may lead to the leakage of the secret key and thus the leakage of image information.In response to the above problems,this article proposes a new ASPE-based secure image retrieval technology program in a cloud environment.The specific work is as follows:1.By modifying the ASPE algorithm,a secure index outsourcing method is designed to reduce the computational consumption of the image owner.This method can use the-means algorithm to establish a secure index in the cloud server while ensuring that the image information is not leaked.The establishment process does not require the participation of the image owner,and the effect is basically the same as that of establishing an index and retrieval locally on the image owner.2.The Paillier homomorphic encryption algorithm is introduced in the image retrieval process of the scheme,so that a secure trapdoor can be generated without the image owner sharing the key to the inquiring user,and the trapdoor can be used for image retrieval.It realizes secure image retrieval when the image owner,cloud server and query user are all semi-trusted,and solves the security problem caused by key leakage.This paper analyzes the security and efficiency of the proposed scheme,and conducts experiments on three public data sets commonly used in the image retrieval field.Through the analysis of the experimental results,it is found that the proposed scheme can be used without sharing the key to the querying user.Perform image retrieval correctly,and the average retrieval accuracy is acceptable.At the same time,the solution implements index outsourcing and reduces the consumption of computing resources for the image owner. |
