File Encryption Laboratory
Secure your files with AES encryption
Encrypt and decrypt your files securely using AES-256 encryption. Your files are processed locally in your browser for maximum privacy and security.
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About File Encryption

File encryption is the process of scrambling the contents of a file so that it is unreadable to anyone without the correct decryption key or password. It's a fundamental aspect of data security, ensuring confidentiality and protecting sensitive information from unauthorized access.

How it Works (Commonly AES):

  1. Key Derivation: A strong cryptographic key is derived from your password using a Key Derivation Function (KDF) like PBKDF2. This process adds computational complexity to make brute-force attacks on your password very difficult.
  2. Encryption Algorithm: The file data is then encrypted using a symmetric encryption algorithm, most commonly Advanced Encryption Standard (AES) in a mode like GCM (Galois/Counter Mode). AES-GCM provides both confidentiality (data secrecy) and integrity (detection of tampering).
  3. Initialization Vector (IV) & Salt: A unique, random Initialization Vector (IV) is used for each encryption operation to ensure that identical plaintexts produce different ciphertexts. A random 'salt' is also used during key derivation to further enhance security by making rainbow table attacks impractical. Both IV and salt are typically stored with the encrypted data.
  4. Decryption: To decrypt, the same password is used with the stored salt to re-derive the key. This key, along with the stored IV, is then used by the AES-GCM algorithm to reverse the encryption process. If the password or data is incorrect/tampered, decryption will fail.

This lab uses modern browser-based cryptographic APIs (Web Crypto API) to perform these operations directly in your browser, ensuring your files never leave your device.