ChaCha20 Encryption Tool
Fast stream cipher with Poly1305.
Encrypt
Decrypt
ChaCha20
XChaCha20
ChaCha20-Poly1305
XChaCha20-Poly1305
Key
Hex
UTF-8
Base64
Enter 32-byte key
IV/Nonce
Hex
UTF-8
Base64
Enter IV/Nonce
Input
UTF-8
Hex
Base64
Waiting for input...
0 chars
Result
Base64
Hex
UTF-8
Not executed
0 chars
LOCAL All operations are completed locally in the browser, no data will be uploaded.

What is ChaCha20?

ChaCha20 is a fast stream cipher. XChaCha20 adds a longer IV/Nonce. Poly1305 provides authentication (AEAD).

🎯

Benefits

  • Fast software performance
  • Side-channel resistant
  • 256-bit security
  • Modern standard
📋

Variants

  • ChaCha20 (12B IV/Nonce)
  • XChaCha20 (24B IV/Nonce)
  • Poly1305 (AEAD)
🚀

Scenarios

  • Mobile security
  • TLS 1.3
  • WireGuard
  • Disk encryption
💎

Features

  • Stream cipher
  • No padding
  • Random access

🚀 Usage Guide

  • Key: Must be 32 bytes (256-bit)
  • IV/Nonce: 12B for ChaCha20, 24B for XChaCha20
  • AAD: For *-Poly1305 only, used for auth but not encrypted
  • TAG: Required for decrypting *-Poly1305 data
  • Important: Never reuse the same (Key, IV/Nonce) pair!

💡 FAQ

Why XChaCha20?
Longer 192-bit IV/Nonce avoids collisions with random generation.
What is Poly1305?
Ensures integrity. Decryption fails if data is tampered with.

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