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    steggy-noencrypt

    2.0.3 • Public • Published

    This is a fork of steggy which removes support for encryption of data, as it was using a deprecated crypto method.

    steggy

    steggy

    About

    This is a basic steganography library inspired by steganography, following the technique outlined here.

    That package depends on lwip, which has a complicated installation process and appears to have fallen out of active development (it's not compatible with Node v7 for example). It's also designed to be used via the command line.

    This package uses the more lightweight pngjs for image parsing, nice ES6+ features, and a pure functional approach. It is designed for programmatic use.

    There is currently only support for .png files.

    Installation

    npm install steggy-noencrypt

    Usage

    To conceal a message in an image:

    const fs = require('fs')
    const steggy = require('steggy-noencrypt')
     
    const original = fs.readFileSync('./path/to/image.png') // buffer
    const message = 'keep it secret, keep it safe' // string or buffer
     
    // encoding should be supplied if message is provided as a string in non-default encoding
    const concealed = steggy.conceal(original, message /*, encoding */)
    fs.writeFileSync('./path/to/output.png', concealed)

    To reveal a message hidden in an image:

    const fs = require('fs')
    const steggy = require('steggy-noencrypt')
     
    const image = fs.readFileSync('./path/to/image.png')
    // Returns a string if encoding is provided, otherwise a buffer
    const revealed = steggy.reveal(image /*, encoding */)
    console.log(revealed.toString())

    Caveats

    This is currently not intended for production use, and should not be used when security is important. Security flaws include:

    1. Use of the alpha channel to encode the end of the message: alpha channels typically vary less than RGB channels, so manipulation may be easier to detect. For example, an original image which is entirely opaque will end up with alpha channel values uniformly set to 254 for the part with the embedded message, followed by uniform values of 255. (solved)
    2. Other things I'm less familiar with...

    Install

    npm i steggy-noencrypt

    DownloadsWeekly Downloads

    318

    Version

    2.0.3

    License

    MIT

    Unpacked Size

    12 kB

    Total Files

    12

    Last publish

    Collaborators

    • npm