Questions tagged [steganography]

Steganography is the art and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message. While cryptography protects the contents of a communication, steganography aims to prevent others from learning that a communication even occurred.

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Error correcting codes that are indistinguishable from random

Suppose you have a public program P(n) which takes message n and generates an encrypted output (utilizing asymmetric cryptography) for some entity which has the private key to decrypt it. Using a ...
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Hide Randomness in Ciphertext

Ciphertext has the property to appear random. As a matter of fact, randomness is the first test, an encryption algorithm must pass. However, there are various setups, which monitor the incoming/ ...
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Crypto system design : How to design Encryption for Zero width characters

Zero width character's can be used to hide text in plain sight.I am building a system where user's can provide their secret message , cover message and a password (key) which I would encrypt and give ...
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DCT Steganography - Where to embed the data

Just a quick question about DCT Steganography. Do you embed the data before or after you send the 8*8 block through the quantization table?
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DCT Steganography Problem

I'm creating an implementation of the DCT Steganography algorithm in Java and I'm having a slight problem. When I embed a message into a cover-image, I am doing so by initially obtaining the DC ...
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Why does the image histogram with ASCII text embedded look this way?

I used histogram attack on image with embedded text ASCII(LSB-method) and found the chi square value. All observed frequencies more than expected frequencies, that is tipical for empty image, and have ...
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Detecting steganography by analysing non-significant data entropy?

I am not thinking only steganography in images, I think it is also possible to encode data for example into the length of spaces of a clear html text. I suspect, the steganography changes (elevates) ...
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WAV file steganography

I'm trying to find a hidden message in a WAV file. It's a song, not some noisy sound. My question is where should I look for the message in data RIFF, FMT or DATA chunk. Should I convert the file to ...
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ASCII characters in an image steganography [duplicate]

Given an image size of 300 by 400, what is the maximum number of ASCII characters (7 bits) that can be embedded using the LSB steganography? I would assume that every pixel can perform an LSB so ...
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Possible deciphering methods for the steganography on an old check? [closed]

This check was deposited in the 1930s, and it was issued by OCBL (an old bank in Singapore). The checks issued by this bank had an interesting feature - an obfuscated pattern printed on the back of ...
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Is there an algorithm to hide text in another text, while preserving the meaning of the latter?

Is there a way to hide a text message $A$ inside another text $B$ using a cryptographic cipher/algorithm, while preserving the sense/meaning of $B$ and without anybody being able to notice there is a ...
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Man Made ELS Codes

This is more steganography, not cyptography, but I don't know where else to post this. Are you familiar with ELS (Equidistant Letter Sequence) codes that some have said are found in the Bible? I know ...
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How would I make a decoder agnostic steganographic file?

I would like to make a steganographic file that can be decoded on multi-platforms, now & 20 years from now. I don't want to do so with software that may be out of date when the message decode is ...
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How does bit-wise operation work for encrypting grayscale images? [closed]

How does bit-wise operation work for encrypting grayscale images? In my Khan Academy course they encrypt an image with bitwise_and, ...
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Transfer and hide ciphertext with hash functions?

Can hash functions be used to transfer and hide ciphertext? This somewhat similar locked question, "If cryptographic hashes are completely unique, could they theoretically be used to transfer data?", ...
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What systems of robust steganography are out there?

By robust, I mean resistant to common image transforms (reversal, crop a non-multiple of 8 pixels off and recompress, blur, solarize to 64 levels, then interpolate, and sharpen, change compression ...
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Is there any other steganography algorithm other than LSB?

LSB is most commonly used in steganography. Which algorithm can be used instead of LSB?
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Can a digital watermark be still extracted from the reprinted digital watermarked image?

If I'm able to extract a watermark from a printed watermarked image, will I be still able to extract the watermark information if I first scan the printed watermark image and reprint it (make a copy ...
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Is steganography valid only for digital images or also for printed images?

If I embed some information in an image using steganography and then I print that image, will I be able to retrieve information from the printed image or not?
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How to steganographically embed data in cropped/resized images?

The problem: An artist posts an image of their work online with a creative commons attribution licence (on site A), someone reposts the image with attribution on another site (site B), the internet ...
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Steganography - How many bytes of information can you hide in a $1024 \times 768$ photo?

I have a photo with a resolution of $1024 \times 768$ which means $786432$ pixels in total. Let's suppose it's a 24-bit color RGB image (so 1 pixel = 3 bytes = 24 bits) and I want to hide information ...
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How can I retrieve data embedded in an image with steganography?

I want to know is there any way to retrieve data embedded in a steganalised image by just scanning the image with mobile scanner? Just like qr code scanning
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Can I use steganography to detect data loss that occurs due to gradual degradation in quality in sequential printing of black and white noise texture?

I want to detect original print and a reproduced print. So if I embed some information in this kind of noise texture, after reproducing the original print there might be some loss in information due ...
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Can one hide a text in an image and then hide that image in another image? [closed]

Using a steganographic algorithm like least significant bit, can one hide a text in an image and then hide that image in another image?
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Ciphertext indistinguishability under a noisy channel w/ error correction

The objective is to broadcast information over a noisy digital channel (corruption rate of say, 10-20 %, where bits flip). Assume the broadcasting software is public and there is no possibility of ...
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In English, are there any words which encrypt to other words under the Caesar Cipher?

Are there any words in the English language which, when encrypted using the Caesar Cipher with any key, result in another English word? How may one go about determining which Caesar shifts are weakest ...
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Key-Exchange in Steganography

I know there are key-exchange methods in Cryptography. But in case of Secret-key Steganography, what actually stego-key means and how can we use the key and once used how we exchange that with the ...
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What are ZK and Fusion algorithms in image steganography

in the literature I have found some algorithms mentioned as ZK and Fusion in image steganography. But I couldn't find any detailed information about these algorithms. Could someone please help to ...
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How should we assess the quality of steganography?

I am asking this question instead of extending the discussion of another question (Perfect Steganography). I did try starting a chat room (https://chat.stackexchange.com/rooms/87636/perfect-...
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Old French Cipher w/ Text Hidden In Drawing

I'm trying to find a cipher challenge I saw a few years back, it was an old drawing (I think 1800's or earlier) with clouds and stars on it and French text was hidden in the image. Does anyone happen ...
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Perfect Steganography

History contain many example of old steganography. We also have digital steganography. Is there any kind of “Perfect Steganography”, in a sense that only the designer can extract the concealed ...
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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, ...
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Why doesn't steganography increase the size of an uncompressed image?

So I have this question. I downloaded a .BMP off google due to .BMPs being not compressed. Just a 1024x768 .BMP image which its size os of 2.25Mb. I put the image in a steganography application.. ...
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Hide secrets in an article composed with Machine Learning?

Say that Alice wants to communicate with Bob, but she does not want any direct contact with him. Instead, Alice will put the secret in public, such as a discussion board, and Bob will come there to ...
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Any efficient text-based steganographic schemes?

While there are sophisticated and efficient steganographic schemes with images as cover available, I am yet ignorant of the existence of any fairly efficient and secure schemes with texts as cover. ...
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What is the role of steganography in network security?

Quick definition: Hiding secret messages inside what seem to be harmless messages is nothing new. The word steganography itself originated in Greece and means “covered writing”. During important ...
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Understanding fail-stop subliminal channels

It has long been known that randomness can be used to create subliminal channels (see Simmons' "Prisoner's problem" in 1983) and that preventing such subliminal channels is hard. For the case at ...
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Is a singular LUKS volume with different passwords that unlock different filesystems possible?

So it's hard to make sense out of the title. Let me elaborate: In LUKS, you can have multiple passwords that unlock the same volume (due to their "unified key setup" where they have a single master ...
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Extracting secret image from cover image

I want to develop a steganography project with using exploiting modification direction method. I started to try and understand how the method works, but I have some questions about decryption. I hid ...
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Why did Histiaeus tattoo his slave's head?

The story is often told that Histiaeus tattooed a secret message on his slave's head, waited for his hair to grow back, then sent him off to Miletus. Why would he have done this? The story is usually ...
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Does limiting the sales market to U.S. only, releive my application of Export Admin Regs? [closed]

I have a steganography application that uses one-time-pad encryption. Obviously, key lengths can be very long. If I were to limit the sales market on the Microsoft Store to U.S. only, would that be ...
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Pad ciphertext with arbitrary number of bits

I have a symmetric-key encryption scheme. I think the output from this scheme (MAC + IV + CBC ciphertext) should already be practically indistinguishable from random, but I would like to pad the ...
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Steganography in speech by adding extra “filler” syllables [closed]

PREAMBLE About 20 years ago, when reading a novel (set in late 1800) by some classic Russian writer I came across very curious example of steganography. The two main characters were peasants who got ...
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Uncovering file hidden in .BMP

I've recently been linked by someone to this particular puzzle which seems to point to a hidden file within the image. The clue given to me was "anagram" although I could not make much sense of it. ...
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How to disguise ciphertext

If I want to have a secret conversation, then I can encrypt it (with OTR etc). However, since big brother watches all communication, sending encrypted data will likely raise flags. Does anyone know of ...
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Standard format to store text in LSB steganography?

I am trying to understand how text is stored in images in LSB. If we consider a 24 bit image, we have 3 values per pixel (RGB). So we can store 3 bits in a pixel. So how do we store 'A' or any other ...
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Determine whether bit sequence is hash?

I would like to know whether it is possible to determine whether a value of for example 256 bit length is a SHA-256 hash or a random, equally distributed value. Is ...
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Algorithms of steganography [closed]

Recently I'm working on steganography and I want to know that what are the main steganography algorithms and how they work. I'll be happy if you help me. thanks.
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Is there a cryptographic method to add noise to a plaintext instead of actually encrypting it?

I'm looking for a cryptographic technique that instead of permuting a cleartext, would add noise to the cleartext to obfuscate the true text among a bunch of garbage. For example, a list of 10 ...
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Is my high school cryptography/steganography science fair project practical?

I'm a 12th grade student interested in a science project in cryptography and steganography for my school's science fair. I chose this path of computer science partly because my coding skills are weak (...