# CTF and Crypto Exercises

![](https://3977837039-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MfT0VPyK6X13Egd9pzy%2Fuploads%2FyNnANoS7597MHPesk8uv%2Fctf02.png?alt=media\&token=a8bdf37a-9581-401d-903b-8bf5f63630aa)

### Exercises

* [Cyberchef Challenge](https://cas-cyber.gitbook.io/cas-cybersecurity/ctf-and-crypto-exercises/cyberchef-challenge)
* [HTB Invite Challenge](https://cas-cyber.gitbook.io/cas-cybersecurity/ctf-and-crypto-exercises/htb-invite-challenge) (no longer available)
* [BSIDES London 2019 Ticket Challenge](https://cas-cyber.gitbook.io/cas-cybersecurity/ctf-and-crypto-exercises/bsides-london-2019-challenge)
* [Ninja Security Challenge](https://cas-cyber.gitbook.io/cas-cybersecurity/ctf-and-crypto-exercises/ninja-sec-challenge)