Cryptography App

A Kotlin-based Android Cryptography App that uses the AES algorithm for text encryption and decryption. The app generates a key during encryption and can store the history of encrypted and decrypted texts.

Features

• Text encryption using AES algorithm
• Key generation during encryption
• Text decryption using the generated key
• History of encrypted and decrypted texts
• Works offline
• Uses javax.crypto library

Screenshots

Home Screen	Encryption	Decryption	History	Icon

Installation

1. Clone the repository:

   git clone https://github.com/yourusername/cryptography-app.git
   cd cryptography-app

2. Open the project in Android Studio.

3. Build and run the project on an Android device or emulator.

   OR

   Go to releases and download the apk file.

Adding APK to GitHub

To add the APK file of your app to GitHub, follow these steps:

1. Build your app in Android Studio to generate the APK file. You can find the APK file in the app/build/outputs/apk/ directory.

2. Create a new release on GitHub:

   • Go to the "Releases" section of your GitHub repository.
   • Click on "Draft a new release".
   • Fill in the tag version (e.g., v1.0) and release title (e.g., Initial Release).
   • Add a description for your release.
   • Attach the APK file by dragging and dropping it into the release description area or by using the "Attach binaries by dropping them here or selecting them" button.
   • Click on "Publish release" to make the release live.

Usage

1. Open the app on your Android device.

2. To encrypt text:

   • Go to the Encrypt section.
   • Enter the text you want to encrypt.
   • Press the Encrypt button to generate the encrypted text and key.

3. To decrypt text:

   • Go to the Decrypt section.
   • Enter the encrypted text and the key.
   • Press the Decrypt button to retrieve the original text.

4. To view history:

   • Go to the History section to see the saved history of encrypted and decrypted texts.

Built With

• Kotlin - The programming language used.
• javax.crypto - For AES encryption and decryption.

Contributing

Feel free to contribute to this project by submitting a pull request. Please make sure to follow the standard GitHub flow when contributing.

Acknowledgments

• Thanks to the creators of the javax.crypto library.
• Inspiration and code snippets from various online resources.

Author

Lav Kalsi