Matheus Saldanha

Ph.D. Student, University of Campinas (Unicamp), Campinas, Brazil

About

I am a Ph.D. student at the University of Campinas (Unicamp), working in the Laboratory of Security and Cryptography (LASCA) under the supervision of Prof. Hilder Lima.

Previously, I earned my M.Sc. and B.Sc. degrees from the Federal University of Santa Catarina (UFSC) under the supervision of Prof. Ricardo Custódio, where I was a member of the Laboratory of Computer Security (LabSEC).

My main research focuses on Fully Homomorphic Encryption (FHE), a technology centered on preserving data privacy during computation. Specifically, I work on reducing the bootstrapping cost of FHE schemes from a theoretical perspective. During my Master's, I also researched applications of Post-Quantum Cryptography (PQC) and theoretical aspects aimed at strengthening the security of isogeny-based cryptographic schemes. More broadly, I am interested in cryptographic primitives studied from an algebraic point of view.

Publications

Hardened CTIDH: Dummy-Free and Deterministic CTIDH

Gustavo Banegas, Andreas Hellenbrand, Matheus Saldanha

Progress in Cryptology – INDOCRYPT 2025

BibTeX PDF HTML Code

@inproceedings{banegas2025hardened,
  title={Hardened CTIDH: Dummy-Free and Deterministic CTIDH},
  author={Banegas, Gustavo and Hellenbrand, Andreas and Saldanha, Matheus},
  booktitle={International Conference on Cryptology in India},
  pages={194--215},
  year={2025},
  organization={Springer}
}

Enhancing LoRaWAN Security: Addressing Static Root Keys with Post-Quantum Cryptography

Matheus Saldanha, Alexandre Augusto Giron, Ricardo Custódio, Thaís Bardini Idalino

Anais do XXV Simpósio Brasileiro de Cibersegurança 2025

BibTeX PDF HTML Code

@inproceedings{saldanha2025enhancing,
  title={Enhancing LoRaWAN Security: Addressing Static Root Keys with Post-Quantum Cryptography},
  author={Saldanha, Matheus de O and Giron, Alexandre A and Cust{\'o}dio, Ricardo and Idalino, Tha{\'\i}s B},
  booktitle={Simp{\'o}sio Brasileiro de Seguran{\c{c}}a da Informa{\c{c}}{\~a}o e de Sistemas Computacionais (SBSeg)},
  pages={367--383},
  year={2025},
  organization={SBC}
}

From LUT to Layer: Neural Network Inference with CKKS Functional Bootstrapping

Matheus Saldanha, Guilherme A. Horn, Mauricio L. Ferreira, Andreis G. M. Purim, Alex L. D. Cassinelli, Hilder V. L. Pereira

Anais do XXVI Simpósio Brasileiro de Cibersegurança 2026

BibTeX PDF HTML Code

@inproceedings{saldanha2026lut,
  title={From LUT to Layer: Neural Network Inference with CKKS Functional Bootstrapping},
  author={Saldanha, Matheus de O and Horn, Guilherme A and Ferreira, Mauricio L and Purim, Andreis GM and Cassinelli, Alex LD and Pereira, Hilder VL},
  booktitle={Simp{\'o}sio Brasileiro de Ciberseguran{\c{c}}a (SBSeg)},
  pages={1415--1421},
  year={2026},
  organization={SBC}
}