Visual cryptography is a cryptographic technique which allows visual information (pictures, text, etc.) to be encrypted in such a way that decryption becomes a mechanical operation that does not require a computer.
Visual cryptography is one of the techniques used in recent times to sustain the secret message broadcast.
complexity of encrypted and decrypted method is reduced in this technique and also two way communication can be achieved very steadily.
Halftone visual cryptography, watermarking visual cryptography, extended visual cryptography using complementary are the different techniques.
Shares pair, auxiliary black pixels and parallel error diffusion are also used.
It is a secret-sharing technique that encrypts a secret image into numerous shares but requires neither computer nor calculations to decrypt the secret image.
Reconstruction of the secret image is done visually: simply by overlaying the encrypted shares the secret image becomes clearly visible.
Easy to implement.
Hard problem dependency is not required while encryption.
No decryption algorithm required, anyone can decrypt the message.
FAX or E-MAIL is the mode of transmitting the cipher text.
The message cannot be predicted by infinite computation method.