Visual cryptography - Wikipedia

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] They demonstrated a visual secret sharing scheme, where an image was broken up into n shares so tha

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