KC
KC
Available for new opportunities

Hi, I'm Krisztián Czeczó.

Beyond offensive work I engineer security software and automation across platforms (iOS, Android, desktop, web and IoT/OT) in Python, JavaScript and PHP — with hardening, monitoring and detection aligned to CIS and NIST benchmarks.

About

A few words about me

I work in offensive security — penetration testing, red teaming, bug bounty and CTF — aligning my work to the standards the industry runs on: OWASP, MITRE ATT&CK, PTES and NIST. I build and operate real, production-grade security tooling used against live, real-world threats.

Beyond offensive work I engineer security software and automation across platforms (iOS, Android, desktop, web and IoT/OT) in Python, JavaScript and PHP — with hardening, monitoring and detection aligned to CIS and NIST benchmarks.

At work
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competition results
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finalist — CyberQuest
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platforms I build on
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commitment
Focus

What I focus on

My core areas on the offensive side of security.

Penetration Testing

Penetration Testing

End-to-end security assessments of web apps, networks and systems, run to industry methodologies (OWASP Testing Guide, PTES) and delivered as clear, CVSS-rated findings with remediation guidance.

OWASPPTESCVSS
Red Teaming

Red Teaming

Adversary emulation of real threat-actor TTPs mapped to MITRE ATT&CK — chaining access across identity, endpoints and Active Directory to measure genuine business risk.

MITRE ATT&CKActive DirectoryEvasion
Bug Bounty & Research

Bug Bounty & Research

Finding and responsibly disclosing real, reproducible vulnerabilities — with professional, CVSS-scored reports that engineering teams can act on.

ReconResponsible disclosureCVSS
CTF Competitions

CTF Competitions

National-level Capture-the-Flag competitions across web, reverse engineering, crypto, forensics and OSINT — real problem-solving under pressure.

WebReversingForensicsOSINT
Skills & tech

What I work with

The standards, systems and tooling I work with day to day — from threat intelligence and OT/ICS security to Linux hardening, network defense and detection engineering.

Threat intelligence & deception

Threat intelligence & deception

Operating internet-facing deception sensors (Cowrie, Conpot) that collect live attacker TTPs and malware, enriched via VirusTotal and turned into actionable threat intelligence.

Threat intelIOCsCowrie
OT / ICS security

OT / ICS security

Securing operational-technology environments and protocols (OPC UA, MES, SCADA) aligned to IEC 62443 — the standards that protect critical infrastructure.

OPC UASCADAIEC 62443
Linux hardening & servers

Linux hardening & servers

Hardening and operating production Linux (Debian) to CIS Benchmark standards — services, automation and least-privilege access.

CIS BenchmarksDebianHardening
Network security

Network security

Designing segmented, defense-in-depth networks — firewalls, VPNs (WireGuard) and zero-trust access on enterprise-grade routing (MikroTik / RouterOS).

Zero TrustFirewallSegmentation
Detection engineering & SOC

Detection engineering & SOC

Building monitoring and detection pipelines (Prometheus, Grafana, Loki, CrowdSec) with alerting mapped to MITRE ATT&CK.

SIEMMITRE ATT&CKDetection
Secure development (SSDLC)

Secure development (SSDLC)

Engineering secure applications and automation (Python, JavaScript, PHP) with a security-first development lifecycle.

SSDLCPythonPHP
Results

Contests & results

What I actually did — every result links to its official source, fully verifiable.

CyberQuest 2025 — national finals
2025

CyberQuest 2025 — national finals

One of the 10 live finalists of the national cybersecurity competition (Óbuda University, at the Bosch Budapest Innovation Campus). Over an eight-hour final I tackled real industry challenges: IoT and automotive network security, network traffic analysis, AI-assisted cybersecurity, web vulnerabilities and OSINT.

IoT securityAutomotiveTraffic analysisAIWebOSINT
↗ source: nik.uni-obuda.hu
9th National IT Challenge
2025

9th National IT Challenge

Strong national finishes across the full stack — software development (C++), DevOps, cloud (Azure) and mobile (iOS / Android):

  • C++ — 15th place
  • DevOps — 15th place
  • Azure Cloud — 19th place
  • Mobile / iOS — 25th place
  • Accessible Web — 24th place
C++DevOpsAzureiOSAndroid
↗ source: megmerettetes.hu
TDK — 3rd place + national (OTDK) nomination
2024

TDK — 3rd place + national (OTDK) nomination

My standout engineering project: a custom-built network scanner and traffic analyzer. It discovers every host and service across a network, analyzes the traffic and results, and presents them clearly — earning 3rd place in the IT Science section and a national OTDK nomination.

NetworkingCustom toolingHost discoveryTraffic analysis
↗ source: uniduna.hu
TryHackMe — hands-on practice
ongoing

TryHackMe — hands-on practice

Completing practical cybersecurity rooms and learning paths on an international platform (see the badge below).

Hands-onRoomsLearning paths
↗ source: tryhackme.com
TryHackMe badge
Build

What I build

Self-developed applications across platforms, and real, production-grade projects running in the wild.

Across platforms
iOS apps

iOS apps

Native applications for iPhone and iPad.

SwiftMobile
Android apps

Android apps

Mobile apps for the Android ecosystem.

AndroidMobile
Desktop / PC

Desktop / PC

Desktop tools and programs — including my TDK network scanner & analyzer.

PythonTooling
IoT & hardware

IoT & hardware

Hands-on IoT and hardware projects — microcontrollers, sensors and wireless security tooling (e.g. ESP32).

ESP32SensorsRF
Selected projects
Threat-intelligence sensor network

Threat-intelligence sensor network

A production, internet-facing deception network (Cowrie, Conpot) capturing live attacks and malware in the wild — turned into actionable threat intelligence with automated alerting and VirusTotal enrichment.

Threat intelCowrieConpot
Visitor management platform

Visitor management platform

A self-hosted, GDPR-compliant visitor management platform in real-world use: digital e-signatures, role-based admin, PDF records and automated data-retention.

PHPGDPRCompliance
Network discovery & analysis tool

Network discovery & analysis tool

An award-winning, custom-built tool that discovers hosts and services across a network and analyzes the traffic — recognized at a national scientific conference.

NetworkingAnalysis
Active Directory security

Active Directory security

Enterprise-style Active Directory adversary emulation — real attack chains mapped to MITRE ATT&CK, built end to end together with the detections to catch them.

Active DirectoryMITRE ATT&CK
GitHub

Code & activity

A live snapshot of my GitHub account — the source code of my projects lives here.

GitHub contribution graph
GitHub stats
Most used languages

Featured repositories

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Let's work together!

Got a project, a question or an opportunity? I'd love to hear from you.

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Contact

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