Repeating Mistakes

Sun, 29 Mar 2026 00:00:00 +0000

Category: Web (felt more like a cryptography challenge)

Difficulty: Easy (40 points)

Author: Romain Fontaine

Description

Our cryptography researcher got hit by a nasty ransomware during his work on some advance encryption standardization. Can you help him recover his encrypted files so he doesn’t lose all his progress?

Solution

This challenge gave us an encryption script, as well as some encrypted files (flag.txt.enc, encarta.txt.enc, Block_diagram.png.enc, …). This is the encryption function in encrypt.py.

Web on CTF Writeups

Repeating Mistakes

Description

Solution