Flutter Steganograph

Flutter Steganograph is a digital image encoding package. it simply takes a message (text or image) and embeds (conceals 🕵️‍♂️) it inside of a cover image with minimum possible alteration to the original cover image.

Installation 🛸

Add flutter_steganograph to your pubspec.yaml:

dependencies:
  flutter_steganograph: ^0.0.1

Usage 📦

Importing the Package

import 'package:flutter_steganograph/flutter_steganograph.dart';

Embed a text into an image 🔩

Embeds a text string into an image. Optional saveImage argument to download embedded image to gallery. Returns the encoded bytes -> Uint8List.

import 'package:image/image.dart' as dImage;
import 'package:flutter_steganograph/src/flutter_steganograph.dart';

final steganograph = Steganograph();
final coverImage = dImage.decodePng(File('/cover_image.png').readAsBytesSync())!;

final embeddedTextImage = steganograph.embedText(
    image: coverImage, 
    text: 'super secret text',
    saveImage: true
    );
// to covert to material image
Image.memory(embeddedTextImage);

Extract a secret text from the encoded image 🔬

Extracts a secret text string from an encoded image. Returns the extracted secret String

import 'package:image/image.dart' as dImage;
import 'package:flutter_steganograph/src/flutter_steganograph.dart';

final steganograph = Steganograph();
final encodedImage = dImage.decodePng(File('/encoded_image.png').readAsBytesSync())!;
int secretLength = secretText.length;

String secretText = steganograph.extractText(
    image: encodedImage, 
    length: secretLength,
    );

Embed a secret Image inside a cover image 🖼️

Embed/encode a secret image inside a cover image. secret image dimensions are smaller than cover image dimensions. Returns the embedded bytes -> Uint8List of encoded image.

import 'package:image/image.dart' as dImage;
import 'package:flutter_steganograph/src/flutter_steganograph.dart';

final steganograph = Steganograph();
final coverImage = dImage.decodePng(File('/cover_image.png').readAsBytesSync())!;
final secretImage = dImage.decodePng(File('/secret_image.png').readAsBytesSync())!;

Uint8List embeddedImage = steganograph.embedImage(
        coverImage: coverImage,
        secretImage: secretImage,
      );
//to covert to material image
Image.memory(embeddedImage);

Extract secret Image from an encoded image 🧮

decode a secret image from the encoded image. Returns the embedded bytes -> Uint8List of secret image.

import 'package:image/image.dart' as dImage;
import 'package:flutter_steganograph/src/flutter_steganograph.dart';

final steganograph = Steganograph();
final encodedImage = dImage.decodePng(File('/encodedImage_image.png').readAsBytesSync())!;
int secretImageHeight;
int secretImageWith;

Uint8List extractedImage = steganograph.extractImage(
        embeddedImage: encodedImage!,
        secretWidth: secretImageHeight,
        secretHeight: secretImageHeight,
      );
//to covert to material image
Image.memory(extractedImage);

Coming soon

encryption 🔒 of secret text and image

Contribution

Feel free to open pull requests that improve the quality of images or performance of the library. Any bugs should be submitted to Issues

Libraries

flutter_steganograph