ChaCha20-Poly1305 AEAD Encrypt & Decrypt Online

This online ChaCha20-Poly1305 tool allows you to securely encrypt and decrypt data using Authenticated Encryption with Associated Data (AEAD). It combines high-performance encryption with built-in integrity verification, ensuring that encrypted data cannot be modified without detection.

ChaCha20-Poly1305 is a modern, RFC 8439 compliant algorithm widely used in TLS 1.3, HTTP/3 (QUIC), WireGuard VPN, and OpenSSH. Unlike traditional encryption schemes, AEAD eliminates the need for separate MAC generation, reducing implementation errors.

We do not store, log any key you enter. This tool is intended for personal and educational use. We suggest not to use online tools to protect real production secrets.

Chacha20 Poly1305 Key Terminologies

What is ChaCha20-Poly1305?

ChaCha20-Poly1305 combines two cryptographic primitives to provide secure authenticated encryption:

• ChaCha20 – a fast stream cipher used for data encryption
• Poly1305 – a message authentication code (MAC) used to ensure data integrity

Together, they ensure that encrypted data cannot be read or modified without detection. You can compare this tool with standalone ChaCha20 encryption online tool.

Why ChaCha20 Instead of AES?

ChaCha20 is designed to offer strong security and high performance across a wide range of platforms:

• Faster on mobile and low-power devices
• Resistant to timing attacks
• Independent of hardware acceleration

Because of these advantages, ChaCha20-Poly1305 is widely adopted in TLS 1.3, HTTP/3 (QUIC), WireGuard, and OpenSSH.

What is AEAD (Authenticated Encryption with Associated Data)?

Authenticated Encryption with Associated Data (AEAD) is a cryptographic construction that provides both confidentiality and integrity in a single operation.

AEAD ensures:

• Encryption of sensitive data
• Authentication of both encrypted data and additional metadata

Unlike traditional encryption combined with HMAC, AEAD prevents many common cryptographic implementation mistakes.

What is Associated Data (AAD)?

Associated Data (AAD) refers to information that is:

• Authenticated
• Not encrypted

Examples include headers, protocol metadata, or identifiers that must be protected from tampering while remaining readable.

🔐 Secret Key Input Options

This tool supports secret keys in Hex and Base64 formats. These formats represent raw 32-byte cryptographic keys and provide maximum interoperability with other ChaCha20-Poly1305 tools.

You may also use a plain-text password as a key. However, using plain text directly is not recommended because such passwords usually lack sufficient entropy.

For stronger security, it is recommended to derive a key from your password using PBKDF2. This approach generates a cryptographically strong 32-byte key using salting and multiple iterations.

⚠️ Important: If PBKDF2 is used, the generated ciphertext can only be decrypted using the same password, salt, and iteration count. Other tools may not be able to decrypt the data unless these parameters are shared.

You can generate a PBKDF2-derived key using: PBKDF2 Hashing Online Tool

Nonce Requirements in ChaCha20-Poly1305

A nonce is a unique value required for every encryption operation.

🔴 Never reuse the same nonce with the same key, as this can completely compromise security.

This tool requires a 96-bit (12-byte) nonce, as specified in RFC 8439.

ChaCha20-Poly1305 vs AES-GCM

Try yourself this AES-GCM encryption online tool to experience the difference.

Use Cases

ChaCha20-Poly1305 is commonly used in the following real-world applications:

• TLS 1.3 secure connections
• HTTP/3 and QUIC protocols
• VPN solutions such as WireGuard
• Secure messaging systems

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