ChaCha20-Poly1305 Website Visualization

This project is an interactive explorer for ChaCha20 Poly1305.

It explains authenticated encryption through visualization.

You learn how modern encryption works by watching it run.

What the project does

Explains ChaCha20 stream cipher

Explains Poly1305 message authentication

Shows how encryption and authentication combine

Follows RFC 8439 standard

Core idea

Encryption alone is not enough.

Authentication alone is not enough.

This project shows why both must work together.

Main sections

How it works

You follow the algorithm flow step by step

Visualization

You see state changes at each round

Python code

You inspect a clean reference implementation

Analysis

You understand security goals and design choices

References

You trace everything back to official specs

Key learning outcomes

How ChaCha20 generates keystream blocks

Why XOR is used for encryption

How Poly1305 builds the authentication tag

Where nonce misuse breaks security

Who this is for

Computer science students

Security learners

Competitive programmers

Anyone studying cryptography

Why this project matters

Most resources stay abstract.

This one shows the process.

You stop memorizing steps.

You start understanding guarantees.

If someone asked you

Why ChaCha20 Poly1305 replaced older constructions

Could you explain it without this tool?