Estuardo Alpirez Bock

My name is Estuardo and I am a Postdoc at the department of Mathematics and Systems Analysis at Aalto University in Finland. I recently obtained my PhD under the supervision of Chris Brzuska, co-advised by Wil Michiels. My research focuses on definitional studies for white-box cryptography, as well as on the design of automated attacks on white-box cryptographic implementations. Before, I was an employee at the Leibniz Institute for High Performance Microelectronics IHP, where I worked on the design and implementation of hardware accelerators for elliptic curve cryptography in the light of side channel analysis attacks.

I've also collaborated as a teaching assistant at the Cryptography course at Aalto University and at the Introduction to Security course at TU Hamburg.

Below you'll find a list of my publications, internships and further research activities from recent years.

Publications

(Preprint) White-box Cryptography with Device Binding from Token-based Obfuscation and more with Shashank Agrawal, Yilei Chen and Gaven Watson
Available on ePrint as Report 2021/767

Security Reductions for White-Box Key-Storage in Mobile Payments with Chris Brzuska, Marc Fischlin, Christian Janson and Wil Michiels
ASIACRYPT 2020 [Slides] [YouTube]

Security Assessment of White-Box Design Submissions of the CHES 2017 CTF Challenge with Alexander Treff
COSADE 2020 [Slides]

On the Security Goals of White-Box Cryptography with Alessandro Amadori, Chris Brzuska and Wil Michiels
TCHES 2020 [Slides] [YouTube]

White-Box Cryptography: Don't Forget About Grey Box Attacks with Joppe W. Bos, Chris Brzuska, Charles Hubain, Wil Michiels, Cristofaro Mune, Eloi Sanfelix Gonzalez, Philippe Teuwen and Alexander Treff
Journal of Cryptology 2019

Doubly half-injective PRGs for incompressible white-box cryptography with Alessandro Amadori, Joppe W. Bos, Chris Brzuska and Wil Michiels
CT-RSA 2019 [Slides]

On the Ineffectiveness of Internal Encodings - Revisiting the DCA Attack on White-Box Cryptography with Chris Brzuska, Wil Michiels and Alexander Treff
ACNS 2018 [Slides] [YouTube]

Increasing the Robustness of the Montgomery kP-Algorithm against SCA by Modifying its Initialization with Zoya Dyka and Peter Langendoerfer
SECITC 2016 [Slides]

Inherent Resistance of Efficient ECC Designs against SCA Attacks with Zoya Dyka, Ievgen Kabin and Peter Langendoerfer
NTMS 2016

Visits and Internships

Visa Research in Palo Alto, California
3 month internship under the supervission of Gaven Watson and in collaboration with Shashank Agrawal and Yilei Chen
February - May 2020

TU Eindhoven, Netherlands
Research visit to Wil Michiels and Alessandro Amadori at the department of Mathematics and Computer Science and Embedded Networked Systems at Eindhoven University of Technology
January - March 2017