profile_picture
Ruben A. Gonzalez

Cryptographer with a focus on implementation security. PhD in cryptography engineering.

Security Researcher, Neodyme AG
ruben@neodyme.io [GPG key]
Visiting Researcher, Max Planck Institute S&P
mail@ruben-gonzalez.de [GPG key]

Interests

  • Cryptography Engineering
  • Post-Quantum Cryptography
  • Advanced Crypto Constructions and Protocols
  • Vulnerability Research & Hacking

Publications

Select Publications
Stateless Hash-Based Signatures for Post-Quantum Security Keys, Applied Cryptography and Network Security Conference (ACNS SCI)
Ruben Gonzalez
blog code pdf
High-assurance zeroization, Transactions on Cryptographic Hardware and Embedded Systems
R Gonzalez , S Arranz Olmos , G Barthe , B Grégoire , V Laporte , J Léchenet , T Oliveira , P Schwabe
code pdf
Rambox TLS Plaintext Recovery - CVE-2023-43972, MITRE
Ruben Gonzalez
KEMTLS vs. Post-quantum TLS: Performance on Embedded Systems, SPACE Conference
R Gonzalez , T Wiggers
code pdf
Croc Full Plaintext Recovery - CVE-2021-31603, MITRE/RedRocket Blog
Ruben Gonzalez , Aaron Kaiser
blog
How to Hack a Satellite (German), P.M. Magazin
P.M. , Ruben Gonzalez
web
Kyber - How does it work? The Inner Workings of the Post-Quantum KEM, Blog Post
Ruben Gonzalez
blog
Reversing and Hacking Age of Empires 2: Definitive Edition, Microsoft/RedRocket Blog
Ruben Gonzalez , F. Stotz
blog
TinyDTLS Full Key Recovery - CVE-2021-34430, NIST/Eclipse
Ruben Gonzalez
web
Verifying Post-Quantum Signatures in 8 kB of RAM, PQCrypto Conference
R Gonzalez , A Hülsing , M Kannwischer , J Krämer , T Lange , M Stöttinger , E Waitz , T Wiggers , Bo-Yin Yan
code pdf slides video
BigBlueButton Local File Inclusion/Privilege Escalation - CVE-2020-12112, MITRE/RedRocket Blog
L. Schauer , Ruben Gonzalez
writeup

Teaching

Trainings, Seminars and further Academic Work
  • Coach: German National Hacking Team , European Cyber Security Challenge
  • Hacking Cryptography , DEFCON Trainings
  • Black Hat Cryptography , Black Hat Trainings
  • Cry.College: Online Lecture on Modern Cryptography
  • Cryptography in the Real World , devSec Conference
  • Cryptography: Hacking and Cracking , Hack in the Box Conference
  • Modern Authentication , Heise Academy
  • Crypto Basics , Golem Karrierewelt
  • WebSecSeminar: Research Seminar on Web Security , Bonn UAS
  • HookFTW: A Windows Hooking Library , Master Project Supervision, Bonn UAS
  • Syntax Aware Fuzzing For Indentifying Parser Differentials , Bachelor Thesis Supervision, Bonn UAS
  • Reviewer , Paper on Improving Schindler Style Error Correction, CARDIS
  • Offensive Security: Online Lecture on Hacking Techniques , Bonn UAS
  • Tutor for Lecture Operating Systems , Constance UAS

Talks

Presentations Held (Selection)
  • Hacking Corporations: A Defender’s Guide , SecIT, Hannover
  • Better Information Security Management in Hospital , DMEA
  • Post-Quantum Migration , BDEW Bundesverband der Energie- und Wasserwirtschaft/German Association of Energy and Water Supply
  • Cyber Security for Judges and Prosecutors , Deutscher Juristentag/German Attorneys Association
  • Web Application Security , Malta Information Technology Agency
  • Kyber and Post-Quantum Crypto - How does it work? , Chaos Communication Congress
  • Foundations of Modern Cryptography , Fraunhofer Academy Training.
  • Laymen’s Guide to Information Security , Fraunhofer Academy Training.
  • Information Security for Endusers , German Farmers Day
  • Curveball - Mircosoft’s Crypto Screwup , Cooleleute.live.
  • Real World Crypto in The Actual Real World , DS Lunch Colloquium, Radboud University.
  • How to Learn (and Teach) Hacking , OWASP AppSec.
  • News On Error Correction Methods for SPA on Blinded Modular Exponentiation , JIL Hardware-Related Attacks Subgroup, Brussels
  • AI, Heuristics and NP in Laymen’s Terms , Datenburg
  • Hosting CTFs with Berlyne , FrOSCon, 2017.

Press

Selection Of Interviews And Press Coverage

Projects

Involved Projects
Board Member - Nachwuchsförderung IT-Sicherheit e.V.
website
Chairman - RedRocket Hacking Club
website
Co-Organizer - Cyber Security Rumble
website
Hackfest - Problem Based Learning Platform for Interactive Course Work
code website
Organizer - German Hacking Championship
website
Edu25519 - Curve25519 Implementation Optimized For Readability
code
Cry.College-Lib - Python Library implementing many crypto primitives.
code
eccfun - Python Library For Interactively Exploring Elliptic Curves
code

CTF Tasks

Hacking Challenges Authored
BfLol, CyberSecurityRumble
Binary Exploitation, Brainfuck Interpreter PWNing, 300/500
challenge writeup
Blow, CyberSecurityRumble
Crypto, Inavlid Curve Attack On Faulty JWT Usage, 500/500
challenge writeup
CyberWall, CyberSecurityRumble
Web, Code Injection, 100/500
challenge writeup
DLog, CyberSecurityRumble
Crypto, Invalid Point Submission Attack, 200/500
challenge writeup
DTlS, CyberSecurityRumble
Crypto, Exploit Faulty DTLS Implementation, 400/500
challenge
EzDSA, CyberSecurityRumble
Crypto, EcDSA Nonce Reuse Attack, 200/500
challenge writeup
Secure Secret Sharing, CyberSecurityRumble
Web, NoSQL Injection Attack, 300/500
challenge writeup
CityRSA, P.W.N. University CTF
Crypto, Exploit Faulty RSA-CRT Implementation, 300/500
writeup
Converter, P.W.N. University CTF
Crypto, Exploit CBC Padding Oracle, 200/500
writeup
H!pster Startup, P.W.N. University CTF
Web, ArangoDB Injection Attack, 300/500
writeup
Whistle, P.W.N. University CTF
Crypto, Exploit Invalid Padding via Coppersmith Attack, 300/500
writeup