writeup
Alpaca CTF 2026: reused-n
Exploit a Common Modulus Attack on RSA with gcd(e1,e2)=2 and recover the flag via integer square root when m² < n
#ctf
#cryptography
#rsa
+3 writeup
2025 Cyber Apocalypse: Crypto Traces
Exploit AES-CTR mode vulnerability in a custom IRC-like server with reused counter initialization
#htb
#ctf
#cryptography
+3 writeup
2024 Cyber Apocalypse: Russian Roulette
Exploit a weak Diffie-Hellman key exchange with small prime modulus
#htb
#ctf
#blockchain
+3 writeup
2024 Cyber Apocalypse: LockTalk
Exploit JWT vulnerabilities in python-jwt version 3.3.3
#htb
#ctf
#web
+3