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What is visual cryptography?

Visual cryptography is a cryptographic technique which allows visual information (pictures, text, etc.) to be encrypted in such a way that the decrypted information appears as a visual image. One of the best-known techniques has been credited to Moni Naor and Adi Shamir, who developed it in 1994. [ 1]

What is image encryption?

Image encryption refers to the process of hiding images from unauthorized access using a secret key. It is a critical challenge in protecting digital visual data, such as medical images, grayscale images, color images, and binary images, which are increasingly applied, stored, and transmitted in the field of computer science.

What are image encryption techniques?

Encryption techniques play a vital role in achieving this goal by transforming the image data into an unreadable and meaningless format for anyone without the proper decryption key. This survey will delve into different image encryption techniques, including symmetric encryption, asymmetric encryption, and hybrid encryption.

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