# Questions tagged [visual-cryptography]

Encrypting images so that they can be decrypted without using a computer, e.g. by superimposing two random-looking images.

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### How can you produce visual cryptography?

I would like to be able to "code" images such as the one seen here on Wikipedia. Is this generally produced with software, or does this require complex programming? Ideally, I would love to be able ...
537 views

### Reusing message in One Time Pad

One of the main rules of the OTP is, that a key should never ever be reused. But if we use some commutative operation (XOR for example) for generating the cipher text, then I don't see any difference ...
237 views

### Explanation of part of a visual cryptography algorithm

I have been working on a project involving visual cryptography and I am stuck with the following problem. My question is related to this paper, AN IMPROVED VISUAL CRYPTOGRAPHY SCHEME FOR SECRET ...
335 views

### Apply visual cryptography to a video stream?

I read that there are different ways to apply visual cryptography. One is to generate two images that when overlapped provide the original image. The main issue of using this approach with a video is ...
102 views

### The role of the dealer in visual cryptography

In visual cryptography schemes (VCS), there is special person called dealer. The dealer sets up the system, and the only one who knows about secret image. After encryption, the dealer distributes the ...
5k views

### Extracting the hidden text off an image embedded with steganography

Is it possible for me to extract the hidden text off a stego-image without using the same application that the hidden text was hidden with. I used 5 applications that do steganography such as, ...
174 views

### Can you explain “k out of n” from the VCS paper by Naor and Shamir

I am new to visual cryptography. I’ve just read the paper “Visual Cryptography” by Moni Naor and Adi Shamir and I'm stuck on the chapter about the “$k$ out of $n$” construction. I am aware that, on ...
124 views

### Number of possible access structure with $n$ person

I want to count number of possible access structures in closed form(if possible) as a variable of $n$,the number of share holder. I have tried in several ways. Still no good progress. It is very hard ...
116 views

927 views

### Can a QR code be scanned if split using visual cryptography?

I'm trying to get a python script to work such a way that it takes a QR code (a jpeg or a png) splits the jpeg into two images as shown here https://github.com/LessonStudio/VisualCryptography I'm not ...
477 views

### Need of Image Encryption [closed]

Question is simple yet confusing, why there is the need for image encryption. How text encryption is different from image encryption if using same technique like AES, DES, Chaotic algorithm. If the ...