CONFidence 2020 CTF: Team Trees
This week, we have teamed up as @blackb6a to play CONFidence 2020 CTF. We end up ranked 15, but we are more proud of ourselves able to solve a reversing challenge called Team Trees (395 points, 5 solves). In particular, we are the first-to-solve to the challenge. It took us around two hours to win the flag. This writeup is written by @harrier_lcc and @mystiz613.
Read More →Google CTF 2020: Oracle
I was teamed-up with @blackb6a on Google CTF this time. I have solved 7 challenges alone and 3 challenges with my teammates. In particular, Oracle is a crypto challenge with 13 solves. It has got me spending 12 hours. All in all, it was a great experience in terms of learning, but my liver hurts. This piece of writeup may be very computation intensive, just because I would like to make everything clear.
Read More →UIUCTF 2020: nookcrypt
nookcrypt is a netcat service that have no source code released. There are two functions exposed: 1. Gets an encrypted copy of the flag (and the message hello world). 2. Encrypts an arbitrary message.
Read More →De1CTF 2020 Writeup
I was teamed up with @shellphish this time for De1CTF. During the game, I have solved 5 (out of 7) cryptography challenges individually, and a reverse challenge and a misc challenge in cooperation with DuSu and fs0c. I said that I'll commit the solution scripts to my Github after I have managed to prettify them. It never happened. I will not make the same promise again.
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PlaidCTF 2020: A Plaid Puzzle
A Plaid Puzzle is a RPG game written in PuzzleScript. In the game, you are able to control as the player and you could move around and mess with a string. The game is available online on PuzzleScript.net.
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