Here are all the writeups for everything Redstone Blockchain did in the X-MAS 2019 CTF! We participated as a small team of 7 with most of us pretty new to doing CTFs. Despite our lack of traditional experience many of us had skills that instantly translated into flags and we managed to snatch up a few stars being the first to solve some challenges!
- Sanity Checks: Merry Christmas! And a warm welcome to X-MAS CTF from our team. We hope you'll enjoy this year's edition :) In this category you have some simple flags that show you how the platform works.
- Binary Exploitation: Binaries, or executables, are machine code for a computer to execute. For the most part, the binaries that you will face in CTFs are Linux ELF files or the occasional windows executable. Binary Exploitation is a broad topic within Cyber Security which really comes down to finding a vulnerability in the program and exploiting it to gain control of a shell or modifying the program's functions.
- Cryptography: Cryptography is the science of protecting messages behind algorithms that rely on special mathematical properties. Those algorithms, known as encryption schemes, can sometimes use insecure mathematics or can be implemented in a sloppy way. Some good places to start learning crypto can be found here and here. Sometimes, you just need to use your googling skills and other times your brain will melt down from all the math you'll encounter.
- Emulation: No descroption was provided
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