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