A machine learning cheat sheet, because there are too many ways to do any one thing.

This is the third in a series of writeups on challenges from the BSidesSF CTF. You can see a writeup of the first challenge, Blink, here and the second, Yay or Nay, here.

Weather Companion was the final mobile challenge in the CTF, this time worth 350 points! We’re provided with an apk file and a prompt that doesn’t set us up with much:

A simple weather application that fetches and displays the weather. What hides within?

This is the second in a series of writeups on challenges from the BSidesSF CTF. You can see a writeup of the first challenge, Blink, here

Yay Or Nay was the second mobile challenge in the CTF, this time worth 200 points. Like last time, we start out with a prompt and an apk file. This time the prompt came in a little more handy.

Keep track of places you would love / hate to see, by dropping markers with a simple click. Try YayorNay v1.2 today!

:::: Updated README :::: v 1.0 - Added short press, Yay support - Fix stability issues

v 1.1 - Added long press, Nay support - Add labels

v 1.2 - Populate from DB - Save to DB

To-do - Fix stability issues - Bug fixes - Implement feature to view by day

The BSidesSF CTF happened about a week ago! It was the first CTF I’ve tried to compete in and I had a lot of fun on the ▣ team. This is the first in a series of writeups on the challenges I participated in.

Blink was the first mobile challenge in the event and served as a good introduction. The goal of the mobile challenges is to find a string (the “flag”) using clues hidden in an app. Often the flag is in the app binary itself, but sometimes the challenge may lead you elsewhere afterwards. Blink was a relatively easy “101” challenge, only worth 50 points (the most difficult challenges in the CTF were worth 600 or more).