Visual cryptography is special encryption technique to encrypt the information contained within an image. In such way it can't be decrypted or recognized by neither cryptanalysis algorithms nor Human Visual System (HVS). Selective image encryption has become very popular due to rapid evolution in information technology and visual communications over open networks, it is considered crucial to real time applications that need to be very fast and perfectly secured, where the digital data must be kept intact from eavesdroppers and unauthorized access.
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