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ChaCha20-Poly1305

Authenticated encryption with ChaCha20-Poly1305 (AEAD).

Note: ChaCha20-Poly1305 is an authenticated encryption (AEAD) construction. The encrypt output has the format nonce:ciphertext+tag as hex. Decryption verifies the authentication tag, so a wrong key or tampered ciphertext is rejected with an error.

What Is a ChaCha20-Poly1305?

The ChaCha20-Poly1305 tool provides authenticated encryption (AEAD). It combines the ChaCha20 stream cipher with the Poly1305 message authentication code, so the output both encrypts the data and protects its integrity. This free online tool is useful for ChaCha20-Poly1305 tool, ChaCha20 Poly1305 online, AEAD encryption. Common use cases include authenticated encryption, APIs, secure protocols, and modern cryptography testing. It is designed for quick browser-based hashing, encoding, decoding, encryption testing, checksum comparison, identifier generation, and cryptography education. For production security, follow the algorithm's current standards, key-management requirements, and application-specific security guidance.

How to Use This ChaCha20-Poly1305

  1. 1
    Choose the algorithm or modeSelect the encryption method supported by the tool.
  2. 2
    Enter the required key materialProvide the password, key, and nonce/IV in the format requested.
  3. 3
    Enter the dataPaste plaintext for encryption or ciphertext for decryption.
  4. 4
    Run the operationThe browser performs the cryptographic transformation locally.
  5. 5
    Verify the resultFor real applications, follow the algorithm's nonce, key-management, authentication, and interoperability requirements.

Frequently Asked Questions

It is a 16-byte MAC computed over the ciphertext. Before decrypting, the tag is verified, so a wrong key or any tampering causes decryption to fail with an error.
The output is nonce:ciphertext+tag as lowercase hex. The nonce is needed to decrypt, so it is stored at the front of the string.

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