dump analysis 4 07CTF 2026: Discord-friend Forensics Writeup Sep 21, 2026 Pwnsec CTF 2026: Spiny-trace Forensics Writeup Sep 16, 2026 Pwnsec CTF 2026: Blindsided Forensics Writeup Sep 15, 2026 CompfestCTF: v20 ABE Offline Decryption Sep 2, 2026