Image covert communication active defense method and system based on salt and pepper noise and recovery network

The invention relates to the technical field of network information security, in particular to an image covert communication active defense method and system based on salt-and-pepper noise and a recovery network, and the method comprises the steps: obtaining an active defense noise image through adding the salt-and-pepper noise into an image object issued by a target network communication sender; the salt-and-pepper noise is used for destroying secret information of a potential secret-carrying image in a target network to realize active defense; the noise image is optimized through the pre-trained recovery network, a final image received by the communication receiver is obtained, and the optimization process is to recover the target image and maintain the active defense effect. According to the method, the salt-and-pepper noise is added into the published image to destroy the secret information of the potential secret-carrying image in the social network, so that the purpose of active defense is achieved, the