Digital Audio Watermarking with RSA Signatures

A robust digital audio watermarking system using RSA cryptography and PN sequences for embedding and verifying unique signatures within WAV files.

Features

✅ Generate RSA key pairs for signing and verification.
✅ Embed a unique digital signature as an imperceptible watermark in the audio file.
✅ Extract and verify the watermark to ensure authenticity.
✅ Robust against minor audio alterations while maintaining integrity.

🚀 Getting Started

1️⃣ Install Dependencies

Make sure you have the following installed:

Install FFmpeg (Required)

Linux (Ubuntu/Debian)

sudo apt install ffmpeg

MacOS

brew install ffmpeg

Windows
Download and install from FFmpeg official website.

Install Go Modules

Run the following inside your project directory:

go mod tidy

2️⃣ How It Works

Convert Audio Format

The WAV file is converted to the required format (Only done due to the limitations of the go-audio package):

cmd := exec.Command("ffmpeg", "-y", "-i", inputFile,
    "-ac", "1", "-ar", "8000", "-acodec", "pcm_s16le", outputFile)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err := cmd.Run()
if err != nil {
    log.Fatalf("FFmpeg conversion failed: %v", err)
}

Generate RSA Keys

privKey, pubKey := utils.GenerateKeys()

Sign the Audio Metadata

signature, err := utils.SignMessage([]byte("Unique watermark metadata"), privKey)
if err != nil {
    log.Fatal(err)
}

Convert Signature to PN Sequence

pn := utils.SignatureToPN(signature)

Embed Watermark in Audio

length := watermark.EmbedWatermark(buffer, pn)

Extract & Verify Watermark

extractedPN := watermark.ExtractWatermark(buffer, length)
extractedSignature := utils.PNToSignature(extractedPN)

if err := utils.VerifySignature([]byte("Unique watermark metadata"), extractedSignature, pubKey); err != nil {
    log.Fatal("Watermark verification failed!")
} else {
    fmt.Println("Successfully verified audio watermark!")
}

🛠 Project Structure

📂 digital-audio-watermarking
│── main.go                     # Main entry point
│── utils/
│   ├── utils.go                 # Key generation, signing, verification
│── watermark/
│   ├── watermark.go             # Embedding and extraction logic
│── go.mod                       # Go module dependencies
│── README.md                    # This file!

🎯 How to Run

1️⃣ Place a WAV file (input.wav) in the project folder.
2️⃣ Run the watermarking process:

go run main.go

3️⃣ The output file (output.wav) will contain an embedded watermark.
4️⃣ The program will extract and verify the watermark.

📜 License

This project is licensed under the MIT License.

🤝 Contributions

Feel free to open issues or submit pull requests to improve this project! 🚀

🔹 Developed with ❤️ in Golang 🔹