Skip to main content
This is a pre-production deployment of Warehouse. Changes made here affect the production instance of PyPI (
Help us improve Python packaging - Donate today!

Software for the exercises in Crypto 101, the introductory book on cryptography.

Project Description


.. image::

This is the client for the game-shaped exercises which are part of
Crypto 101, the introductory book on cryptography by lvh_.

Here's a screenshot of the client:

.. image::

Testing and documentation

The short version: use tox_.

The long version: see the extra notes for merlin_.

Whence the name?

The server side to this is called merlyn_, because the step-by-step
oracle-like model reminded me of Merlin in the AM complexity class and
`Arthur-Merlin protocols`_. (It's not spelled the usual Merlin,
because that primo PyPI real estate was already taken up by some weird
setuptools fork.)

Since Arthur is the person who performs the protocol together with
Merlin, it only made sense to name this project `arthur`. Finally,
clarent_, named after king Arthur's ceremonial sword, holds common

.. _lvh:
.. _tox:
.. _merlyn:
.. _clarent:
.. _`Arthur-Merlin protocols`:

Release History

This version
History Node


Supported By

Elastic Elastic Search Pingdom Pingdom Monitoring Dyn Dyn DNS Sentry Sentry Error Logging CloudAMQP CloudAMQP RabbitMQ Heroku Heroku PaaS Kabu Creative Kabu Creative UX & Design Fastly Fastly CDN DigiCert DigiCert EV Certificate Google Google Cloud Servers DreamHost DreamHost Log Hosting