Visual Cryptography based Authentication of Fog Devices
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Abstract
Visual cryptography (VC) is a method of distributing secret images in the form of shares to different users. Each share displays either random noise or a random binary pattern. A secret image is visible only when all shares are stacked together. The paper proposes a cloud-fog architecture in which the cloud server uses VC technique to authenticate the Fog devices trying to connect with it. A secret code is generated by the cloud server and divided into two shares, one of which is shared with the fog device. When a fog device connects to a cloud server, it sends the shared image to the cloud. The cloud then stacks the received share image with its own share image. If the secret image is shown, the fog device is verified and can transfer data or communicate with the cloud server. Further, the proposed architecture uses K out of N visual cryptography to authenticate the group of Fog devices, where K shares out of N are required to reveal the secret image.
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