Archive for Cryptography

BlueHens CTF 2022 MCU – Geoguesser OSINT – Historical Ciphers Writeup

Prompt: This problem brought to you by GRUMBOT Who Framed Jessica?
_JOCRQ{1t_jd5_ir1jr_ll1kcc_a11_n10qv}
Find the location of this photo to use as the key to decode our flag.

I participated in the BlueHens CTF 2022 on the weekend of Oct 28th 2022. While this event was several months ago, I still wanted to share my write-ups from my favorite challenges.

Read more

CTFLEARN: BruXOR Writeup

Prompt: There is a technique called bruteforce. Message: q{vpln’bH_varHuebcrqxetrHOXEj No key! Just brute .. brute .. brute … 😀

Read more

CTFLEARN: Hextroadinary Writeup

Prompt: Meet ROXy, a coder obsessed with being exclusively the worlds best hacker. She specializes in short cryptic hard to decipher secret codes. The below hex values for example, she did something with them to generate a secret code, can you figure out what? Your answer should start with 0x.

0xc4115 0x4cf8

Read more