CipherCanvas - Advanced Cryptography and Steganography Tool

CipherCanvas is a browser-based crypto + stego lab that can encrypt, decrypt, hide text in images, and hide full image files in other images.

Core Features

• AES-GCM with PBKDF2-SHA256 for passphrase encryption.
• RSA-OAEP + AES hybrid encryption.
• ECDH-P256 + AES hybrid encryption.
• Caesar and Vigenere (educational ciphers).
• Text-in-image steganography and extraction.
• Image-in-image steganography and extraction.
• Optional AES protection for hidden payloads.

Power Features Added

• Versioned stego container format (STG2) with payload checksum (CRC32).
• Stricter payload validation for malformed ciphertext and metadata.
• Capacity meter for carrier images.
• Copy and download actions for crypto output.
• Guided workflow buttons:
  • Encrypt -> Fill Secret Text
  • Extract -> Load Crypto Input
• RSA key helpers:
  • Generate, save, load
  • Public key fingerprint display
• ECDH key helpers:
  • Generate, save, load
• Drag-and-drop support for image inputs.
• Preview cards for selected files.
• Operation progress bars for hide/extract tasks.

Run

Option 1 (direct):

1. Open index.html in a modern browser.

Option 2 (local server):

1. Run python3 run.py
2. Open http://127.0.0.1:8000

Usage Notes

• Use PNG carriers for best reliability.
• JPEG can corrupt hidden bits due to lossy compression.
• Encoded output is always generated as PNG.
• Capacity depends on carrier resolution.
• RSA and ECDH keys are stored in browser local storage only when you press Save.

Security Notes

• Classical ciphers (Caesar, Vigenere) are for learning only.
• Local storage key saving is convenient but less secure than dedicated key vaults.
• For high-assurance production systems, use audited cryptographic tooling, secure key management, and independent security review.