Rubén Diz Martínez

Computer Engineer & Cybersecurity Specialist.

I'm a Computer Engineer with a Master's in Cybersecurity. I currently work as a Cybersecurity Analyst, facing real-world problems on a daily basis and wrestling with systems to ensure everything runs securely. When I'm not tinkering in the terminal or automating tasks, I enjoy playing CTFs and exploring new technologies. Away from the keyboard, I like studying languages and unwinding with a good TV series, movie, or book.

rdiz@portfolio:~$ whoami
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📍 Galicia, Spain 🎓 Master in Cybersecurity 🟢 Available for new projects
may 2026 — current
(full-time, hybrid)

Cybersecurity Analyst

Galician Institute of Technology

Analysis of vulnerabilities, incident response, system hardening and continuous improvement of the organization's security posture.

dec 2025 — may 2026
(part-time, hybrid)

Student Internship

Galician Institute of Technology, Venancio Salcines Foundation

Hardening of accounts, endpoints, and corporate data in Office 365, implementing security measures and best practices to ensure compliance with the ENS (Spanish National Security Framework).

sep 2025 — dec 2025
(part-time, hybrid)

Student Scholarship

Galician Institute of Technology

Administration and hardening of corporate networks and critical systems, ensuring infrastructure security, integrity and availability.

may 2024 — sep 2024
(full-time, hybrid)

Student Internship

NTT DATA, Naru Foundation

Design and development of back‑end and front‑end systems focused on communication functionalities, aimed at reaching specific population segments within the healthcare sector.

sep 2023 — may 2024
(part-time, hybrid)

Student Scholarship

NTT DATA

Development and maintenance of robust back‑end and front‑end systems for healthcare applications, improving efficiency, user experience and data management.

sep 2024 - mar 2026

Master in Cybersecurity

University of A Coruña, Faculty of Computer Science
  • Honor distinction in Privacy and Anonymity
  • Honor distinction in Fortification of Operating Systems
  • Honor distinction in Ethical Hacking and Intrusion Testing
  • Honor distinction in Security in Mobile Devices
  • Honor distinction in Forensic Analysis
  • Honor distinction in the Master’s Thesis:
sep 2020 — jul 2024

Degree in Computer Engineering

University of A Coruña, Faculty of Computer Science

Information Technology Itinerary

  • Honor distinction in Organization Administration and Management
  • Honor distinction in Programming Paradigms
  • Honor distinction in Computer Fundamentals
  • Honor distinction in Internet and Distributed Systems
  • Honor distinction in Integrative Programming
  • Honor distinction in IT Infrastructure and Systems Administration
Defense, SIEM & Analysis Autopsy ELK Fortinet FTK Imager Splunk Microsoft Defender (EDR) Sysinternals Volatility Wireshark
OffSec, Audit & Compliance BurpSuite Metasploit Nmap Nessus OWASP ZAP OpenVAS OWASP Top 10 ENS
Infra, Cloud & DevOps Linux OpenBSD Windows Server AWS (EC2) Docker Terraform Jenkins OpenVPN Wireguard
Scripting & Tools Python Bash C Java SQL Git SonarQube Grafana Prometheus Postman
Languages
es_ES Spanish Native
gl_ES Galician Native
en_GB English B2 First (FCE) Cambridge English
Volunteering
2023 — 2024

Mentor of first year students

University of A Coruña, Faculty of Computer Science

Mentoring of first-year students during their initial year to help them adapt to the university environment and academic demands.

Participations
2024

Datathon University Hack finalist

Cajamar Data Lab

Creation of a prediction model that can estimate the concentration value in the final antigen, identifying the process paramepers with the greatest impact.

Onion Routing

A proof of concept implementation of onion routing for secure, multi-hop message transmission. By utilizing an MQTT message broker as the central forwarder, this project enables agents to encrypt, route and decrypt arbitrary messages while preserving anonymity.

Cryptography MQTT Python Anonymity Multi-hop Encryption Privacy-Enhancing
see project →

Vector Commitment

A proof-of-concept implementation of a secure vector bit commitment protocol for trustless, distributed decision-making. Using an MQTT broker and a secure Pseudo-Random Generator, two untrusted parties can commit, prove and verify arbitrary bit sequences without a third party.

Cryptography MQTT Python PRG Zero-Trust Distributed Systems
see project →

Advanced Access Content System

A proof-of-concept implementation of a broadcast encryption system with device revocation, modeled after the Advanced Access Content System (AACS). It simulates a network of media devices organized in a binary tree of keys, distributing encrypted content while selectively revoking compromised nodes.

Broadcast Encryption Binary Key Tree Python Key Management Device Revocation
see project →

Double Ratchet

A proof-of-concept chat application implementing the Double Ratchet algorithm, the cryptographic backbone of messaging systems like Signal and WhatsApp. It combines a Diffie-Hellman ratchet and a symmetric-key ratchet to exchange end-to-end encrypted messages over an MQTT broker.

E2EE Diffie-Hellman Python MQTT Signal Protocol Perfect Forward Secrecy
see project →

Let's talk about your next project!

Send me a message and I'll get back to you as soon as possible.