steganograph 1.0.0

Steganograph is a pure Dart steganography library which supports hiding mesages and files in images with an option to encrypt embedded secrets for more security.

steganograph

---

Steganograph is a pure Dart steganography library which supports hiding mesages and files in images with an option to encrypt embedded secrets for more security.

Install 🚀

In the pubspec.yaml of your Flutter/Dart project, add the following dependency:

dependencies:
  steganograph: ^1.0.0

Import the package in your project 📥

import 'package:steganograph/steganograph.dart';

Embed messages or files 🔏

//this returns an image file with the resulting image unaltered
//except now it has some secret embedded text
File? file = await Steganograph.encode(
    image: File('sample_image.jpg'),
    message: 'Some secret message',
    outputFilePath: 'result.png',
  );

//this returns an image file with the resulting image unaltered
//except now it has some secret embedded file
File? encodedFile = await Steganograph.encodeFile(
    image: File('sample_image.jpg'),
    fileToEmbed: File('sample_file.pdf'),
    outputFilePath: 'result.png',
  );

Decode and extract embedded messages or files 📨

String? embeddedMessage = await Steganograph.decode(
  image: File('result.png'),
);

final embeddedFile = await Steganograph.decodeFile(
  image: File('result.png'),
);

Using encryption 🔐

Embedded messages/files can be encrypted to securely share images with secret content wherever without revealing said content.

Symmetric Encryption 🔗

//Encode image with an encryption key
File? file = await Steganograph.encode(
    image: File('sample_image.png'),
    message: 'Some secret message',
    encryptionKey: ENCRYPTION_KEY,
    outputFilePath: 'result.png',
  );

//decode with same encryption key used to encode 
//to retrieve encrypted message
 String? embeddedMessage = await Steganograph.decode(
    image: File('result.png'),
    encryptionKey: ENCRYPTION_KEY,
  );

Asymmetric Encryption ⛓

//generate keypair
SteganographKeypair keypair = Steganograph.generateKeypair();

//Encode image with public key from keypair
File? file = await Steganograph.encode(
    image: File('sample_image.png'),
    message: 'Some secret message',
    encryptionKey: keypair.publicKey,
    encryptionType: EncryptionType.asymmetric,
    outputFilePath: 'result.png',
  );

//Decode image with private key from keypair to retrieve message
String? embeddedMessage = await Steganograph.decode(
    image: File(file!.path),
    encryptionKey: keypair.privateKey,
    encryptionType: EncryptionType.asymmetric,
  );

Supported file types 🗂

Currently, you can embed messages and any kind of file in:

• PNG images
• JPEG images

Contributions 🫱🏾‍🫲🏼

Feel free to contribute to this project.

If you find a bug or want a feature, but don't know how to fix/implement it, please fill an issue.
If you fixed a bug or implemented a feature, please send a pull request.