Secured by means of visual cryptography data input dialogue

摘要

A method of secure transmission and reception of a message from a user. An image (320) representing a plurality of input means, e.g. an image of a keypad, is generated and encoded. The image is encoded using visual cryptography using a key sequence stored in a decryption device (310) as randomization. The randomized image is transmitted to the client device (301), where it is displayed on a first display (501) .The randomization is displayed on a second display (311) .Superimposing the first and second displays reveals the image. The client device (301) allows the user to select particular spots on the first display (501) that correspond to the location of particular input means on the reconstructed image. The coordinates of these spots are transmitted back to the server (300), which can translate them to the particular input means selected by the user. The message is then constructed as the input symbol represented by the particular input means.