# UIUCTF 2021

![](https://3167364547-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MX1bWRlBzHpEPe1TYDD%2Fuploads%2Fgit-blob-43c0e545c0b09a16827df2bf6988283c26807199%2Fimage.png?alt=media)

This was my first time playing the annual UIUCTF, and I must say it was a really great experience. [Social Engineering Experts](https://ctftime.org/team/154571) ended in 18th place, out of 658 scoring teams.

![](https://3167364547-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MX1bWRlBzHpEPe1TYDD%2Fuploads%2Fgit-blob-c77dce84f7b5479135c5b68854eadd276a37e139%2FScreenshot%202021-08-03%20at%2011.30.14%20AM.png?alt=media)

I tried my hand at a variety of challenges across categories such as forensics and web exploitation.

![](https://3167364547-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MX1bWRlBzHpEPe1TYDD%2Fuploads%2Fgit-blob-8d43ee37acd063402220e98652cfa188618ef010%2FScreenshot%202021-08-03%20at%2011.46.09%20AM.png?alt=media)

It was a tough 48 hours, but the satisfaction from solving each challenge was definitely worth it! Glad that [Angmar](https://angmar2722.github.io/CTFwriteups/2021/uiuctf2021/) and I pushed through, solving two of the challenges way past midnight and a few hours before the CTF ended.

![](https://3167364547-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MX1bWRlBzHpEPe1TYDD%2Fuploads%2Fgit-blob-f94ec5eae7e12f4ac0a0b3fbd190b5d6766d99be%2FScore%20over%20Time.png?alt=media)

I also won a $100 bounty for the first blood on [Pwnies Please](https://ctf.zeyu2001.com/2021/uiuctf-2021/pwnies_please), a machine learning challenge that required solvers to generate adversarial examples to fool an image classification model.

![](https://3167364547-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MX1bWRlBzHpEPe1TYDD%2Fuploads%2Fgit-blob-3d8d6648afd6cd9f6d43cb7cec59078f81ba23e2%2FScreenshot%202021-08-03%20at%2012.10.01%20PM.png?alt=media)

## Writeups

| Challenge                                                                                | Category  |
| ---------------------------------------------------------------------------------------- | --------- |
| [back\_to\_basics](https://ctf.zeyu2001.com/2021/uiuctf-2021/back_to_basics)             | crypto    |
| [ponydb](https://ctf.zeyu2001.com/2021/uiuctf-2021/ponydb)                               | web       |
| [yana](https://ctf.zeyu2001.com/2021/uiuctf-2021/yana)                                   | web       |
| [buy\_buy\_buy](https://ctf.zeyu2001.com/2021/uiuctf-2021/buy_buy_buy)                   | misc      |
| [pwnies\_please](https://ctf.zeyu2001.com/2021/uiuctf-2021/pwnies_please)                | misc      |
| [Q-Rious Transmissions](https://ctf.zeyu2001.com/2021/uiuctf-2021/q-rious-transmissions) | misc      |
| [capture the :flag:](https://ctf.zeyu2001.com/2021/uiuctf-2021/capture-the-flag)         | forensics |
| [SUPER](https://ctf.zeyu2001.com/2021/uiuctf-2021/super)                                 | forensics |