We are presented are django app which allows us to store text notes that can contain special placeholders which will be replaced by emoji images after uploading the note. For example

:grinning_face:

will be resolved to an image file name 1F600.png. The possible emoji keys that can be used …

We are presented with a simple webservice written in go which randomly changes the encryption key every 672 ms and outputs the encrypted flag. However if we analyze the seed that is used to initialize the random number generator ...

func changer() {
    ticker := time.NewTicker(time.Millisecond * 672).C
    for range …

URL: RACTF2021

Github: ractf

Writeups can be found at Really Awesome CTF 2021

We are given a docker container that presents us a gunicorn web-app. Just as in the Fancy Button Generator challenge we are asked to verify our session using the api-endpoint at location /pow. By looking at the app.py we can see that this time the difficulty was increased to …

URL: RaRCTF 2021 Capture The Flag

Github: RarCTF2021-Challenges-Public

Writeups can be found in category RaRCTF 2021 Capture The Flag

In this category info about CTFs are listed. The writeups for each CTF can be found in the category for the CTF.