To overcome the security problems in image retrieval, we propose a privacy-preserving image retrieval scheme based on deep convolutional neural network (DCNN) and vector homomorphic encryption (VHE). However, outsourcing images to cloud servers without any processing may reveal the users’ privacy, because the images may contain sensitive information about users, such as faces and locations, especially in electronic investigation. In existing technologies, images are often outsourced to cloud servers to reduce storage and computing burdens. With 5G and Internet technologies developing rapidly, outsourcing images to cloud servers has attracted growing attention.
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