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Friedrich Wiemer

PhD; CEO and Co-Founder

Bosch

cryptosolutions

Biography

Friedrich did his PhD at Gregor Leander’s Workgroup of Symmetric Cryptography at the Horst Görtz Institute for IT-Security, Ruhr University Bochum. His research interests include the design and analysis of cryptographic schemes, in particular symmetric primitives such as block ciphers. Together with Gregor, Friedrich founded cryptosolutions, providing excellent cryptographic consulting services.

When he needs a change from the mathematics, he devotes his time to photography, or to tinker with Linux, develop hardware in VHDL or glorify functional programming. Friedrich occasionally contributes to the SageMath computer algebra system and is a founding member of the FluxFingers e.V. CTF team.

Interests

  • Symmetric Cryptanalysis
  • Symmetric Cryptography
  • Hardware Development
  • Functional Programming
  • Photography

Education

  • PhD in Symmetric Cryptography, 2019

    Ruhr University Bochum

  • MSc in IT-Security, 2016

    Ruhr University Bochum

  • BSc in IT-Security, 2013

    Ruhr University Bochum

Experience

 
 
 
 
 

Security Manager

Bosch

Apr 2020 – Present Stuttgart
 
 
 
 
 

CEO and Co-Founder

cryptosolutions

Apr 2019 – Present Essen

Responsibilities include

  • Cryptanalysis
  • Cryptographic Design

of cryptographic schemes and the organisation and realisation of trainings.

 
 
 
 
 

Research Assistant and PhD Student

Ruhr University Bochum

May 2016 – Mar 2020 Bochum
Besides the research for my PhD thesis, I gave classes for students and participated in the faculties self-administration.
 
 
 
 
 

Student Research Assistant and Qualifying Fellow

Ruhr University Bochum

Dec 2011 – Apr 2016 Bochum

During my studies I worked as a student research assistant on several projects, in particular the following two:

  1. “High-Speed Implementation of bcrypt Password Search using Special-purpose Hardware”, where I developed a VHDL bcrypt core and evaluated its password hashing rate on a FPGA.
  2. “Parallel Implementation of BDD Enumeration for LWE”, where I developed a highly parallel C++ implementation of a CVP algorithm and evaluated its speedup for applications in the cryptanalysis of lattice-based cryptographic schemes.

Recent Publications

PRINCEv2 - More Security for (Almost) No Overhead

In this work, we propose tweaks to the PRINCE block cipher that help us to increase its security without changing the number of rounds …

On the security of the Rescue hash function

In this report, we cryptanalyse the Rescue hash function. In particular, we look at linear and differential cryptanalysis of Rescue, …

Security Arguments and Tool-Based Design of Block Ciphers

Block ciphers form, without doubt, the backbone of today’s encrypted communication and are thus justifiably the workhorses of …

Out of Oddity -- New Cryptanalytic Techniques against Symmetric Primitives Optimized for Integrity Proof Systems

The security and performance of many integrity proof systems like SNARKs, STARKs and Bulletproofs highly depend on the underlying hash …

Recent & Upcoming Talks

Security in Zone-based E/E Architectures

The inner-vehicles network, i.e. the E/E architecture, faces a huge transition: from a Domain-centralized one, where Electronic Control …

Cryptanalysis of Clyde and Shadow

We discuss the choice of round constants, subspace trail attacks and division properties for our NIST submission Spook.

BISON – Instantiating the Whitened Swap-Or-Not Construction

We give the first practical instance – BISON – of the Whitened Swap-Or-Not construction. After clarifying inherent limitations of the …

BISON – Instantiating the Whitened Swap-Or-Not Construction

We give the first practical instance – BISON – of the Whitened Swap-Or-Not construction. After clarifying inherent limitations of the …

BISON – Instantiating the Whitened Swap-Or-Not Construction

We give the first practical instance – BISON – of the Whitened Swap-Or-Not construction. After clarifying inherent limitations of the …

Recent Posts

LFSR StreamCipher Challenge

Write-Up for my hack.lu 2018 challenge ‘LFSR StreamCipher’