Stego • Hide Messages in Images

🔐 Cryptography Details

This application uses military-grade encryption combined with steganography to hide messages inside images.

AES-256-GCM

Your message is encrypted using Advanced Encryption Standard with 256-bit keys in Galois/Counter Mode:

256-bit keys provide 2²⁵⁶ possible combinations
GCM mode provides authenticated encryption, detecting tampering
Used by governments and militaries worldwide

PBKDF2 Key Derivation

Your passphrase is converted into an encryption key using Password-Based Key Derivation Function 2:

200,000 iterations of SHA-256 hashing
Makes brute-force attacks computationally expensive
Unique salt ensures identical passphrases produce different keys

LSB Steganography

The encrypted message is hidden in the image using Least Significant Bit encoding:

Modifies the last bit of pixel color values
Changes are invisible to the human eye
First 32 bits store the encrypted payload length
Works with PNG format to preserve data

How It Works

Encoding:

Generate encryption key from passphrase
Encrypt message with AES-256-GCM
Embed encrypted data in image pixels
Download steganographic image

Decoding:

Extract hidden bits from image pixels
Regenerate key from passphrase
Decrypt and authenticate the message

🛡️ Military-Grade Security

100% Offline Encryption

Decrypted Message: