{"id":23610,"date":"2015-02-10T10:54:37","date_gmt":"2015-02-10T10:54:37","guid":{"rendered":"http:\/\/vskills.in\/certification\/blog\/?p=23610"},"modified":"2024-04-03T13:15:24","modified_gmt":"2024-04-03T07:45:24","slug":"visual-cryptography","status":"publish","type":"post","link":"https:\/\/www.vskills.in\/certification\/blog\/visual-cryptography\/","title":{"rendered":"Visual cryptography"},"content":{"rendered":"
\"visual-cryptography\"<\/a><\/div>\n
Visual cryptography (VC) was introduced by Moni Naor and Adi Shamir at EUROCRYPT 1994.<\/div>\n
<\/div>\n
<\/div>\n
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 may or may not require a computer.<\/div>\n
It is used to encrypt written material (printed text, handwritten notes, pictures, etc) in a perfectly secure way.<\/div>\n
OR- Visual Cryptography<\/div>\n
Divide image into two parts<\/div>\n
Separately, they are random noise<\/div>\n
Combination reveals an image<\/div>\n
<\/div>\n
\"visual-cryptography<\/a><\/div>\n
<\/div>\n
\u00a0k out of n sharing problem<\/div>\n
k out of n sharing problem<\/div>\n
For a set P of n participants, \u00a0a secret image S is encoded into n shadow images called shares (shadows), where each participant in P receives one share.<\/div>\n
The original image is visible if any k or more of them are stacked together, but totally invisible if fewer than k transparencies are stacked together.<\/div>\n
k out of n example (k=3,n=4)<\/div>\n
General k out of k Scheme<\/div>\n
<\/div>\n
In k out of k, the image is visible only if all the shares are stacked together.<\/div>\n
If any share in k is lost, and remaining shares are stacked together, it will not form the image.<\/div>\n
Thus, in k out of k, all the shares are important<\/div>\n
\u00a0 \u00a0 to construct the image.<\/div>\n
\u00a02 out of 2 Scheme (2 subpixels)<\/div>\n
<\/div>\n
\"visual-cryptography<\/a><\/div>\n
<\/div>\n
X-OR Visual Cryptography<\/div>\n
It is a type of cryptography technique in which we encode image in such a way that we get original image after decoding.It is not possible in normal cryptography technique.Decoding can be done by human visual system or directly with the help of computer<\/div>\n

Click here for government certification in Security<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Visual cryptography (VC) was introduced by Moni Naor and Adi Shamir at EUROCRYPT 1994. 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 may or may not require a computer. It is used to encrypt written material…<\/p>\n","protected":false},"author":601,"featured_media":24530,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[1556],"tags":[916,2049],"class_list":["post-23610","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security-2","tag-cryptography","tag-visual-cryptography"],"acf":[],"yoast_head":"\nVisual cryptography - Vskills Blog<\/title>\n<meta name=\"description\" content=\"Visual cryptography is a technique which allows visual information to be encrypted in such a way that decryption becomes a mechanical operation\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.vskills.in\/certification\/blog\/visual-cryptography\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Visual cryptography - 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