> For the complete documentation index, see [llms.txt](https://thienguen.gitbook.io/ctf-writeups/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://thienguen.gitbook.io/ctf-writeups/ctf/2025/nullconctf/crypto.md).

# crypto

## Challenges

<figure><img src="https://2268275695-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FUrHD5lu5pQjrB9B8IR6W%2Fuploads%2FIlYz8BajIiKjeeXQ1lQj%2Fimage.png?alt=media&amp;token=3625a6b9-ff0b-4350-bff3-20f728bb145d" alt=""><figcaption></figcaption></figure>

gg, will write later...😪.