AES-256-GCM Encryption & Decryption Studio
Data privacy and secure text storage are fundamental requirements in modern cybersecurity. The DwellixTools AES-GCM Encryption & Decryption Studio provides a client-side cryptographic environment for encrypting sensitive plain text, passwords, configuration secrets, and private notes into authenticated ciphertext packages.
Powered by the browser’s native Web Crypto API (window.crypto.subtle), our studio implements AES-256-GCM (Galois/Counter Mode) encryption combined with PBKDF2 (Password-Based Key Derivation Function 2) and SHA-256 hashing. All encryption keys, initialization vectors (IV), and salts are generated locally inside your browser—ensuring your unencrypted secrets never leave your device.
Key Features & Security Architecture
- AES-256-GCM Authenticated Encryption: Implements 256-bit AES encryption in Galois/Counter Mode. GCM mode provides both confidentiality and built-in cryptographic authentication, detecting any unauthorized tampering or bit modification of the encrypted ciphertext.
- PBKDF2 Key Derivation Engine: Derives strong 256-bit encryption keys from user passphrases using PBKDF2 with 100,000 SHA-256 iterations and unique 16-byte random salts.
- Cryptographically Secure Randomness: Uses
window.crypto.getRandomValues()to generate cryptographically strong 12-byte Initialization Vectors (IV) and 16-byte salts for every individual encryption operation. - Standardized JSON Package Format: Export encrypted payloads as clean, portable JSON packages containing the salt, IV, and Base64-encoded ciphertext payload for easy storage or secure sharing.
- 100% In-Browser Privacy: Zero network transmission. Your plain text inputs, master passwords, derived keys, and decrypted outputs are processed entirely inside local browser memory.
How AES-256-GCM Authenticated Encryption Works
[ Plain Text Input ] + [ Passphrase ]
│
├───► PBKDF2 (100,000 Iterations + 16-Byte Salt) ──► 256-Bit Master Key
│
└───► AES-256-GCM (12-Byte IV) ──► [ Encrypted Ciphertext + Auth Tag ]- Passphrase Hashing: Your passphrase is combined with a randomly generated 16-byte salt and stretched through 100,000 iterations of PBKDF2 with SHA-256 to create a 256-bit key.
- Authenticated Ciphertext Generation: The 256-bit key encrypts your plain text using a unique 12-byte IV. AES-GCM appends a 128-bit authentication tag to guarantee message integrity.
- Safe Packaging: The resulting salt, IV, and ciphertext are formatted into a clean JSON structure or Base64 string ready for secure transmission or storage.
Technical Security Comparison
| Cryptographic Attribute | Standard AES-CBC | DwellixTools AES-256-GCM |
|---|---|---|
| Key Length | 128 / 256 bits | 256 bits (Maximum Security) |
| Authentication Tag | None (Vulnerable to padding oracle attacks) | Built-in 128-bit GCM authentication tag |
| Key Derivation | Basic single-pass hashing | PBKDF2 (100,000 SHA-256 iterations) |
| Randomness Source | Software Math.random() (Weak) | Web Crypto getRandomValues (Secure) |
| Execution Environment | Remote server API | 100% local browser Web Crypto API |
Frequently Asked Questions (FAQ)
Can DwellixTools recover my plain text if I forget my password?
No. Because encryption happens 100% locally using your master password and your password is never stored or transmitted, it is mathematically impossible for anyone to recover your data without the correct passphrase.
What happens if the encrypted ciphertext is modified or corrupted?
AES-GCM includes an authenticated tag check. If even a single character or byte in the ciphertext, salt, or IV is altered, decryption will fail with a security authentication error.
Is it safe to store the generated JSON package in cloud notes or email?
Yes. Without your secret passphrase, the JSON package containing the salt, IV, and ciphertext cannot be decrypted using current computing technology.
Where can I verify that my data remains local?
You can open your browser’s Developer Tools (F12) Network tab while encrypting or decrypting. You will observe zero outgoing HTTP/HTTPS network requests.