> For the complete documentation index, see [llms.txt](https://cas-cyber.gitbook.io/cas-cybersecurity/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cas-cyber.gitbook.io/cas-cybersecurity/ctf-and-crypto-exercises.md).

# CTF and Crypto Exercises

![](/files/UoVFUd7FhfEv4C1Ui6Ga)

### Exercises

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