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Felix Pfeiffer

MSc Information Security at UCL

Felix Pfeiffer is an information security student at University College London (UCL). He worked on applied cryptography at Fraunhofer IOSB, on cyber threat reporting at BaFin and on application security at AXA. He co-founded Cosmoshield, a recovery service for crypto phishing victims, and Pakt, a goal-tracking app.

“Most attacks don't succeed because people are careless, but because systems make the wrong choice too easy. I want to build systems that are secure by design, so that people stay safe without even noticing.”

Quick facts

Name
Felix Pfeiffer
Field
Information security
Studies
MSc Information Security, University College London (2026 to 2027)
Degree
BSc Cyber Security & Computer Science, University of Bonn (grade 1.2)
Based in
London, United Kingdom
Previously
Fraunhofer IOSB, BaFin, AXA
Co-founded
Cosmoshield (2022), Pakt (2026)
Languages
German, French, English
GitHub
ctrl-Felix
LinkedIn
felixpf

Experience

Student Assistant, Fraunhofer IOSB

Aug 2023 – Aug 2026

  • Developed a C++ prototype for 4Crypt, a module for cryptographically secured video processing
  • Implemented threshold cryptography in Python for 4Crypt
  • Integrated remote attestation into ROS2 and open62541 using Python and C++

Internship, BaFin

Oct 2025 – Nov 2025

  • Contributed to BaFin's cyber threat picture by analysing public, vendor and internal audit data
  • Supported a working group defining supervisory expectations for incident reporting under DORA
  • Prepared materials for the German Financial Cyber Crisis Roundtable with CISOs of major German financial institutions

Internship, IT Security & Identity and Access Management, AXA

Feb 2025 – May 2025

  • Wrote the governance concept for the Contrast Security IAST scanner and kicked off its rollout
  • Defined ownership, prioritisation and deadlines for fixing findings
  • Onboarded teams through sessions and a weekly Q&A call

Ventures

Co-founder, Pakt

Jan 2026 – Present

  • Goal-tracking app, live on iOS and Android, where users commit a self-chosen amount that is charged only if they miss their goal
  • Designed and built the entire tech stack: Flutter app, Litestar API, PostgreSQL, Keycloak, Stripe and OneSignal

Co-founder, Cosmoshield

Mar 2022 – Jul 2025

  • Recovered more than $3M in staked cryptocurrency for 500+ phishing victims worldwide
  • Built tooling in Python and Rust to withdraw victims' staked funds, with their authorisation, the moment the unbonding period ended
  • Built the client website with live chat, wallet ownership verification, scheduling and payments

Education

MSc Information Security, University College London

Oct 2026 – Sep 2027

  • Modules: Introduction to Cryptography, Computer Security I & II, Cybercrime

BSc Cyber Security & Computer Science, University of Bonn

Oct 2023 – Sep 2026

  • Grade 1.2, equivalent to First Class Honours
  • Thesis at Fraunhofer FKIE: Detecting Domain Generation Algorithms in Malware Sandbox Reports

Open source

  • mospy: Extendable Python library for the Cosmos ecosystem, published on PyPI as mospy-wallet
  • cosmospy-protobuf: Python Protobuf library for the Cosmos ecosystem, published on PyPI
  • Whois: Look up who registered a domain, when it expires and which name servers it uses.
  • DNS Records: Look up the DNS records of a domain: addresses, mail servers, TXT and CAA.
  • Subdomain Finder: Find the subdomains of a domain in public certificate transparency logs.

Skills

Security tools
Contrast Security (IAST), SonarQube and CodeQL (SAST), Dependabot, Wireshark, Nmap, OpenSSL, Keycloak (OAuth/OIDC)
Security concepts
OWASP Top 10, MITRE ATT&CK, threshold cryptography, remote attestation
Languages
Python, C++, C, Rust, Go, Dart, TypeScript, JavaScript, SQL, Bash, PHP
Frameworks
Flutter, React, Litestar, FastAPI, Cosmos SDK, Protobuf/gRPC, Symfony
Infrastructure
Linux, Proxmox, Docker, Nginx, Redis, GitHub Actions, Stripe, Ollama

Questions

Who is Felix Pfeiffer?

Felix Pfeiffer is an information security student at University College London. Before UCL he earned a BSc in Cyber Security and Computer Science at the University of Bonn, worked at Fraunhofer IOSB, interned at BaFin and AXA, and co-founded Cosmoshield and Pakt.

What does Felix Pfeiffer study?

He studies MSc Information Security at UCL in London since October 2026. His bachelor's degree in Cyber Security and Computer Science from the University of Bonn has the grade 1.2, equivalent to First Class Honours. His thesis at Fraunhofer FKIE detected domain generation algorithms in malware sandbox reports.

Where has Felix Pfeiffer worked?

At Fraunhofer IOSB from 2023 to 2026 he built threshold cryptography and remote attestation for secure video processing, robotics and industrial control software. At BaFin, the German financial regulator, he contributed to the cyber threat picture and to incident reporting under DORA. At AXA he wrote the governance concept for an IAST security scanner and started its rollout.

Which companies did Felix Pfeiffer found?

He co-founded Cosmoshield in 2022, which recovered more than $3M in staked cryptocurrency for over 500 phishing victims, and Pakt in 2026, a goal-tracking app on iOS and Android where users commit money they only pay if they miss their goal.

What open source software has Felix Pfeiffer written?

He maintains mospy, a Python library for the Cosmos blockchain ecosystem published on PyPI as mospy-wallet, and cosmospy-protobuf, the Protobuf definitions for it. He also built this website and its free whois, DNS and subdomain tools.

How can I contact Felix Pfeiffer?

By email at felixpfeifferbw@t-online.de, on LinkedIn as felixpf or on GitHub as ctrl-Felix.

GitHub · LinkedIn · Email · Updated 2026-10-11 · Felix Pfeiffer