XChaCha20-Poly1305 Encryption
Modern authenticated encryption with Argon2id key derivation. Designed by Daniel J. Bernstein.
🔐 Your Data is Fully Protected
Your data is fully protected using XChaCha20-Poly1305 encryption with Argon2id key derivation. We never store your data, passwords, or encrypted results anywhere on our website or in any database.
About This Algorithm
Encryption: XChaCha20
- 256-bit stream cipher
- 24-byte extended nonce
- No padding required
- Constant-time operations
Authentication: Poly1305
- 128-bit authentication tag
- One-time authenticator
- Argon2id key derivation
- Memory-hard KDF protection
Remember this password - you'll need it to decrypt the data
About XChaCha20-Poly1305 Encryption
XChaCha20-Poly1305 is a modern authenticated encryption algorithm designed by Daniel J. Bernstein. It combines the ChaCha20 stream cipher with the Poly1305 message authentication code, providing both confidentiality and integrity in a single operation. The "X" prefix indicates the extended-nonce variant with a 192-bit nonce, making random nonce generation perfectly safe.
Technical Specifications
Stream Cipher: ChaCha20
ChaCha20 is a high-speed stream cipher that generates a keystream using 20 rounds of the ChaCha quarter-round function. It operates on 512-bit blocks and is immune to timing attacks due to its use of only addition, XOR, and rotation operations.
Authentication: Poly1305
Poly1305 is a fast, one-time authenticator that produces a 128-bit authentication tag. It uses polynomial evaluation over a prime field and provides strong forgery resistance when used correctly with a unique key per message.
Key Derivation: Argon2id
Argon2id is the winner of the Password Hashing Competition. It's memory-hard, meaning it requires significant memory to compute, making it resistant to GPU and ASIC-based attacks. This provides superior protection against brute-force attacks compared to PBKDF2.
Extended Nonce (XChaCha20)
The 192-bit extended nonce allows for safe random nonce generation without collision risk. With 192 bits, you can randomly generate nonces for billions of encryptions without any practical chance of reuse.
Why Choose ChaCha20-Poly1305?
✓ Advantages
- • Fast without hardware support: Excellent on devices without AES-NI
- • Constant-time: Immune to timing side-channel attacks
- • Large nonce: 192 bits eliminates nonce reuse concerns
- • Modern design: Created with lessons from older ciphers
- • Widely adopted: Used in TLS 1.3, WireGuard, Signal, and more
📊 Comparison with AES-GCM
- • AES-GCM: Faster with hardware acceleration (AES-NI)
- • ChaCha20: Faster without hardware acceleration
- • AES-GCM: 96-bit nonce (careful management needed)
- • XChaCha20: 192-bit nonce (safe random generation)
- • Both: Equivalent security when used correctly
How Your Data is Protected
This tool uses secure server-side processing with libsodium, a highly audited cryptographic library. We use XChaCha20-Poly1305 for encryption and Argon2id for key derivation. Your data is processed in isolated memory and immediately discarded after encryption/decryption. We never store your plaintext, password, or encrypted results anywhere on our website or in any database.