Invisible visual password encryption method and system

The invention discloses an invisible visual password encryption method and system, and relates to the technical field of communication security, and the method comprises the steps: a sender carries out the pixel extension based on a secret image, a verification image and a first sharing image through employing a visual password technology, and obtains three second sharing images; the sender calculates the phase information of each second shared image by using a phase recovery algorithm, and sends the three second shared images to the receiver through the three participants; the receiver performs Fourier transform on the phase information of each second shared image to obtain three third shared images; and superposing the three third shared images to obtain the secret image. According to the invention, the security of secret image transmission is improved. 本发明公开一种不可见视觉密码加密方法及系统，涉及通信安全技术领域，该方法包括：发送方基于秘密图像、验证图像和第一分享图像，采用视觉密码技术进行像素扩展，得到三张第二分享图像；发送方利用相位恢复算法，计算各所述第二分享图像的相位信息，并通过三个参与方分别将三张所述第二分享图像发送到接收方；接收方对各所述第二分享图