This repository is a community archive of Capture The Flag (CTF) challenges, solutions, and security talks from the SecTalks meetup group across multiple cities (Sydney, London, Berlin, etc.). It contains hundreds of challenge files (binaries, scripts, packet captures, images) and corresponding solution writeups and scripts. The repo is not a unified software application or data pipeline; it is a heterogeneous collection of security-related artifacts spanning many years. The primary value is as a reference for CTF participants and security enthusiasts. The code quality varies widely: some solution scripts are well-crafted cryptographic attack implementations (e.g., RSA common modulus, CTR nonce reuse) that could be reused in other CTF contexts, while many are one-off scripts tightly coupled to specific challenges. The repository lacks centralized dependency management, and many challenges require specific environments or tools. It is actively maintained with recent commits and talks.