e0sec

Offensive security research · International

Independent offensive security research team specialising in penetration testing, vulnerability research, and red team operations. Active CTF competitors under team tag e0sec — regularly placing in international competitions.

• Penetration testing — web, API, infrastructure
• Red team operations
• Vulnerability research
• Security training & workshops
• PTaaS engagements

e0sec@proton.me

• No Hack No CTF 2026
  4-6 July · 844 teams · Captained by Existing!?! and 0xPrime
  126th
  R3CTF 2026
  4-6 July · 917 teams · Captained by Existing!?! and 0xPrime
  159th
  V1T CTF 2026
  27–28 June · 952 teams · Captained by 0xPrime and e1
  112th
• RiffHack 2026
  19–22 June · 514 teams · Captained by 0xPrime
  103rd
• Operation Heist CTF 2026
  13–14 June · Captained by e1
  17th
• THEM?!CTF 2026
  29–31 May · 920 teams · Captained by 0xPrime
  28th
• GPN CTF 2026
  5–6 June · 1138 teams · Captained by 0xPrime
  73rd
• DEF CON CTF Qualifier 2026
  22–25 May · 686 teams · Captained by 0xPrime
  255th
• Guardians Qualifications 2026
  19 Jan – 1 Feb 2026 · 130 teams · blue team defence · Captained by e1
  22nd
• 0xfun CTF 2026
  12–14 Feb · 1351 teams · Captained by e1
  297th

• CyberGame Slovakia 2026
  1 Mar – 9 May · NBU SR / SK-CERT · 920 participants · top 1% nationally
  8th
• BSides Bratislava CTF 2026
  5–8 May · regional practitioners
  2nd