Nullcon CTF Writeups

A collection of writeups for challenges solved during the Nullcon CTF competition.

Challenges Completed

Challenge	Category	Solution
A slice of keys	Cryptography	Key analysis and extraction
Field trip	Web/Misc	Web application exploitation
Grandmas notes	Forensics	File analysis and recovery
Hidden strings	Reverse Engineering	String extraction and analysis
Magnetic tape 443	Forensics	Data recovery from magnetic media
Power tower	Cryptography	Mathematical cryptographic analysis
pwgen	Reverse Engineering	Password generator analysis
Simple ECDSA	Cryptography	Elliptic curve cryptography exploitation
usbstorage	Forensics	USB storage device analysis

Structure

Each challenge directory contains:

• Solution files and exploits
• Detailed analysis and methodology
• Flags and proof of concept

Tools Used

• Static analysis tools
• Cryptographic libraries
• Forensics utilities
• Custom scripts and exploits