https://ryancamargo.com Cybersecurity and technology notes, labs, CTF write-ups and research by Ryan Camargo. Learning in public. en Sat, 03 Oct 2026 07:02:52 GMT https://ryancamargo.com/posts/python-for-security-tooling/ https://ryancamargo.com/posts/python-for-security-tooling/ Tue, 29 Sep 2026 00:00:00 GMT Ryan Camargo A practical, beginner-friendly intro to writing small security tools in Python — a concurrent port scanner and a dictionary hash cracker, with ethics baked in. programming programming python security tooling https://ryancamargo.com/posts/tcp-ip-notes/ https://ryancamargo.com/posts/tcp-ip-notes/ Sat, 18 Jul 2026 00:00:00 GMT Ryan Camargo Study notes on the TCP/IP model — the four layers, the three-way handshake, TCP states, and a practical look at reading a packet capture with tcpdump and tshark. networking networking tcp ip osi https://ryancamargo.com/posts/first-tryhackme-lab/ https://ryancamargo.com/posts/first-tryhackme-lab/ Mon, 04 May 2026 00:00:00 GMT Ryan Camargo A learning-in-public write-up of the methodology I used on my first TryHackMe beginner Linux room — recon, enumeration, and the mindset that finally clicked. labs ctf tryhackme learning writeup https://ryancamargo.com/posts/linux-file-permissions/ https://ryancamargo.com/posts/linux-file-permissions/ Sun, 22 Mar 2026 00:00:00 GMT Ryan Camargo A grounded tour of rwx, octal notation, chmod, chown, umask, and the special bits — explained the way I wish someone had explained them to me. linux linux security sysadmin https://ryancamargo.com/posts/dns-from-first-principles/ https://ryancamargo.com/posts/dns-from-first-principles/ Sun, 08 Feb 2026 00:00:00 GMT Ryan Camargo A grounded walkthrough of how DNS actually resolves, the records that matter, and the security boundaries every defender should understand. networking networking dns cybersecurity https://ryancamargo.com/pt-br/posts/linux-file-permissions/ https://ryancamargo.com/pt-br/posts/linux-file-permissions/ Sun, 22 Mar 2026 00:00:00 GMT Ryan Camargo Um passeio fundamentado por rwx, notação octal, chmod, chown, umask e os bits especiais — explicado como eu gostaria que tivessem me explicado. linux linux security sysadmin https://ryancamargo.com/pt-br/posts/dns-from-first-principles/ https://ryancamargo.com/pt-br/posts/dns-from-first-principles/ Sun, 08 Feb 2026 00:00:00 GMT Ryan Camargo Um passeio fundamentado sobre como o DNS realmente resolve nomes, os registros que importam e os limites de segurança que todo defensor deveria entender. networking networking dns cybersecurity https://ryancamargo.com/es/posts/linux-file-permissions/ https://ryancamargo.com/es/posts/linux-file-permissions/ Sun, 22 Mar 2026 00:00:00 GMT Ryan Camargo Un recorrido fundamentado por rwx, notación octal, chmod, chown, umask y los bits especiales — explicado como me hubiera gustado que me lo explicaran. linux linux security sysadmin https://ryancamargo.com/es/posts/dns-from-first-principles/ https://ryancamargo.com/es/posts/dns-from-first-principles/ Sun, 08 Feb 2026 00:00:00 GMT Ryan Camargo Un recorrido fundamentado de cómo resuelve DNS realmente, los registros que importan y los límites de seguridad que todo defensor debería entender. networking networking dns cybersecurity