LSB Image Steganography - A command line application program

LSB Image Steganography : a simple tool that hides and retrieves text in BMP images using least-significant-bit encoding with password (magic string) protection.

Development Highlights

Features implemented:

• 🖼️ Encode Message – Hide secret text from a file into a .bmp image
• 🔐 Magic String Protection – Encode and decode only with the correct password
• 📁 Decode Message – Extract the hidden text from the stego image
• ⚙️ File Validation – Checks all input and output files before processing
• 💡 LSB Technique – Uses Least Significant Bit manipulation to embed data safely
• 📊 Capacity Check – Verifies image size before encoding to prevent data loss
• 📜 Modular Design – Separate source and header files for clarity and maintenance
• 🧠 Error Handling – Handles invalid formats, missing files, and mismatched passwords gracefully
• 💾 Output File – Creates a new stego.bmp file containing the hidden message
• 🧩 Command-Line Interface – Simple CLI interaction for encoding and decoding operations