Thursday, December 18, 2008

Awesome to Cryptography!













There is a surprising technique in cryptography that is used to cipher up the visual information, like images, text and many others. The thing special here, that makes it different from other traditional cryptography is, you don’t need a computer for its decryption, as it'll be done by a human Visual System. This blend of cryptography was innovated in the year 1994 by Moni Naor and Adi Shamir. The two guys illustrated a visual privacy sharing technique, in which an image was scattered up into number of dotted points (n shares) and only one who possess all “n shares” can decrypt the image, and none of “n shares” depict or show information regarding the original image. Each share from many was printed on a different transparency, and the decryption was done by overlaying the n shares. When all n shares were overlaid, the original image would be shown in obvious.