Cookies Policy
The website need some cookies and similar means to function. If you permit us, we will use those means to collect data on your visits for aggregated statistics to improve our service. Find out More
Accept Reject
  • Menu
Interest
Topics
Details

Details

  • Name

    João Soares Resende
  • Cluster

    Computer Science
  • Role

    Research Assistant
  • Since

    01st October 2016
Publications

2021

A Kolmogorov Complexity for multidisciplinary domains

Authors
S. Resende, J; Almeida, M; Martins, R; Antunes, L;

Publication
Proceedings of Entropy 2021: The Scientific Tool of the 21st Century

Abstract

2021

Hardening of cryptographic operations through the use of Secure Enclaves

Authors
Brandao, A; Resende, J; Martins, R;

Publication
Computers & Security

Abstract

2020

Employment of Secure Enclaves in Cheat Detection Hardening

Authors
Brandão, A; Resende, JS; Martins, R;

Publication
Trust, Privacy and Security in Digital Business - Lecture Notes in Computer Science

Abstract

2019

pTASC: trustable autonomous secure communications

Authors
Sousa, PR; Cirne, A; Resende, JS; Martins, R; Antunes, L;

Publication
Proceedings of the 20th International Conference on Distributed Computing and Networking, ICDCN 2019, Bangalore, India, January 04-07, 2019

Abstract

2019

Breaking MPC implementations through compression

Authors
Resende, JS; Sousa, PR; Martins, R; Antunes, L;

Publication
International Journal of Information Security

Abstract
There are many cryptographic protocols in the literature that are scientifically and mathematically sound. By extension, cryptography today seeks to respond to numerous properties of the communication process beyond confidentiality (secrecy), such as integrity, authenticity, and anonymity. In addition to the theoretical evidence, implementations must be equally secure. Due to the ever-increasing intrusion from governments and other groups, citizens are now seeking alternatives ways of communication that do not leak information. In this paper, we analyze multiparty computation (MPC), which is a sub-field of cryptography with the goal of creating methods for parties to jointly compute a function over their inputs while keeping those inputs private. This is a very useful method that can be used, for example, to carry out computations on anonymous data without having to leak that data. Thus, due to the importance of confidentiality in this type of technique, we analyze active and passive attacks using complexity measures (compression and entropy). We start by obtaining network traces and syscalls, then we analyze them using compression and entropy techniques. Finally, we cluster the traces and syscalls using standard clustering techniques. This approach does not need any deep specific knowledge of the implementations being analyzed. This paper presents a security analysis for four MPC frameworks, where three were identified as insecure. These insecure libraries leak information about the inputs provided by each party of the communication. Additionally, we have detected, through a careful analysis of its source code, that SPDZ-2’s secret sharing schema always produces the same results. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.

Supervised
thesis

2019

Android Security by Introspection

Author
João Vasco Bispo Estrela

Institution
UP-FCUP