Crypto CTF 2022 WriteUp By tl2cents

It’s my first time to participate in such a pure crypto competition this year. Too many crypto challenges tucked into a game within 24 hours are driving me a little unconscious. By the way, the time schedule is totally unfriendly to me in China time zone which keeps me out of the first blood. I spent about 9 hours working on the crypto challenges and finally solved 8 (checkin not included) of them with rank 51. There are various math tricks for those challenges. However, I have to mention that the descriptions of some challenges are vague and confusing, and I guess that’s why there are so few solutions to an easy challenge (not solved by me either, emmm). I’ve been moyuing for half month at home, so I decide to update this writeup in my blog. Due to time constraints, I didn’t even browse all the challenges of this competition, and I will review it later when I’m spare… Take a rain check.

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Crypto writeup for zer0pts 2022

Last weekend I participated in zer0pts 2022 CTF online as a team member of Never Stop Exploiting (abbreviation: NeSE).We’re happy to get the first place in this high level competition. I focused on the crypto challenges and spent two days struggling with five challenges : Anti-Fermat、CurveCrypto、EDDH、OK、Karen, finally four of them solved. They are all well-designed and here are the writeups for Anti-Fermat、CurveCrypto、EDDH、OK.

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NeSE升级赛

上周六（3.5）参加了NeSE乙升甲的升级赛，很幸运解出题通过了升级赛，正式成为NeSE主队队员。接触CTF一年多，从萌新到会一点点密码学，这算是参加CTF竞赛的又一个重要的节点。之后我参加国际赛的次数可能也就多了起来，博客看情况更，复盘解题过程有时候虽然收获很多，但太费时间了。虽然毕设还是云里雾里，但今天还是在忙着摸鱼之际（bushi）抽空细写了这道和线性代数相关的密码学题解。

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tag:

    缺失模块。
    1、请确保node版本大于6.2
    2、在博客根目录（注意不是yilia-plus根目录）执行以下命令：
    npm i hexo-generator-json-content --save

    3、在根目录_config.yml里添加配置： 

      jsonContent:
    meta: false
    pages: false
    posts:
      title: true
      date: true
      path: true
      text: false
      raw: false
      content: false
      slug: false
      updated: false
      comments: false
      link: false
      permalink: false
      excerpt: false
      categories: false
      tags: true


Hi, this is tl2cents
Currently Ph.D at IIE of UCAS
Graduated from USTC (2018-2022)

CTFer
Focus on blockchain, crypto and reversing
Team member of NeSE and Nebula

Research
Blockchain | ETH | FHE
PQC | Cryptography | Android

Contact Me
echo Y2F4dWxhc2FlbGFAb3V0bG9vay5jb20K | base64 -d

Thanks for JoeyBling and Litten