CNN (Convolutional Neural Network) and signcryption technology-based secret state image retrieval method and system

The invention discloses a CNN (Convolutional Neural Network) and signcryption technology-based secret state image retrieval method and system, and the method comprises the steps that firstly, a data owning client obtains a registration request sent by a user client, and generates an owner private key, a user private key and a signcryption parameter; based on the private key of the owner, each image in the image set is encrypted by adopting an image encryption algorithm to obtain a encrypted image set, and the encrypted image set is uploaded to the two cloud servers; then, the user client obtains a to-be-queried image, encrypts the to-be-queried image by adopting an image encryption algorithm based on the user private key to obtain a to-be-queried encrypted image, and uploads the to-be-queried encrypted image to the two cloud servers; and finally, the two cloud servers retrieve in the secret state image set based on the CNN to obtain a matched image of the to-be-queried secret state image, and the matched imag