flutter_steganograph

Description:

flutter steganograph

Flutter Steganograph #

Flutter Steganograph is a digital image encoding package that embeds a message (text or image) into a cover image/text using the least significant bit (LSB) technique with minimal alteration to the original cover image/text.
Installation 🛸 #
Add flutter_steganograph to your pubspec.yaml:
dependencies:
flutter_steganograph: ^0.1.0
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Usage 📦 #
Importing the Package
import 'package:flutter_steganograph/flutter_steganograph.dart';
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Embed a secret text into a cover text ♟️ #
Embeds a secret text inside a cover text using zero-width characters.
Returns a string with the secret message embedded inside cover text, invisible to normal readers.
import 'package:flutter_steganograph/src/flutter_steganograph.dart';

final steganograph = Steganograph();

String embeddedText = steganograph.embedTextInText(
coverText: 'cover text sample',
secretMessage: 'super secret text to hide',
);
print(embeddedText);
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Extract the secret text from cover text ♖ #
Extracts a text message embedded in a text using zero-width characters.
Returns the extracted secret message. If no secret message is found, returns a message indicating this.
import 'package:flutter_steganograph/src/flutter_steganograph.dart';

final steganograph = Steganograph();

String secretText = steganograph.extractTextFromText(
encodedText: 'cover text sample',
);
print(secretText);
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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);
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Extract the 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,
);

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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);
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Extract the 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);
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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