Visual cryptography is an interesting and important approach to the encryption of images. It is keyless in nature, because it divides the image into multiple shares that, when combined, reconstruct the original image. In its original formulation, it does not even require a computer for the decryption to be performed. However, using it for transmitting digital images requires computer-managed communication, which may introduce an overhead for communicating the different shares securely in separate channels. Selective encryption is a remarkable method of decreasing the computational overhead of the encryption process, by selecting only parts of the image to actually be encrypted. There are many interesting methodologies for how the selection process is achieved. This paper envisages a selective keyless image encryption technique using a single share, which is targeted mainly to wide area surveillance applications. It provides all benefits of visual cryptography being architecturally keyless, while maintaining a single communication channel for sending a single share, and uses selective encryption to encrypt only parts of each image.

Published in: World Congress on Sustainable Technologies (WCST-2019)

  • Date of Conference: 9-11 December 2019
  • DOI: 10.2053/ICITST.WorldCIS.WCST.WCICSS.2019.0001
  • ISBN: 978-1-913572-06-8
  • Conference Location: London, UK