Portugal Crypto Day

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Portugal Crypto Day 2025 will take place in Porto at ISEP. This will be the second edition of the event, which is intended to showcase some of the latest research taking place in the field of cryptography and its applications.

The programme consists of Invited Talks and contributed Short Talks or Posters. We invite submissions for short, contributed presentations or posters.

If you would like to present your work, please submit a title and abstract (max 300 words). Based on the number and quality of submissions, we will determine the final format (short talks, posters, or a combination of both). This is an excellent opportunity for students and early-career researchers to present their work and exchange ideas with experts in the field.

Date: Friday, 12th December 2025

Location: Instituto Superior de Engenharia de Porto - Instituto Politécnico de Porto, R. Dr. António Bernardino de Almeida 431, 4249-015 Porto

Programme:

Title (Abstracts / Slides) Speaker
10:00 Opening and Registration Organisers
10:30 A Practical Oblivious Pseudorandom Function Protocol from Learning with Rounding Alex Davidson, FCUL
11:10 Efficient Fully Homomorphic Encryption with Polynomial Noise Overhead Antonio Guimarães, IMDEA
11:50 Short Talk: An Attack to Universally Composable Commitments from Malicious Physically Uncloneable Functions and how to Avoid it Lourenço Abecasis, IST
12:10 Short Talk: Symmetric Private Information Retrieval: Rényi Divergence for Improved Security Proofs Samuel Pearson, IST
12:30 Lunch
13:50 How Modern Cryptography Breaks in Practice Filipe Casal, Trail of Bits
14:30 Digital signature schemes from isogeny-based cryptography Maria Corte-Real Santos, ENS Lyon
15:10 Short Talk: Practical, Efficient, and Secure Federated Learning via Hybrid Homomorphic Encryption Ivan Costa, GECAD-ISEP
15:30 Break
16:00 From Quantum Channels to Physical Unclonability: Grounding Cryptography in the Physical World Paulo Mateus, IST
16:40 A Stroll Through Provable Security: Real-vs-Ideal Models and Ideal Functionalities Bernardo Portela, FCUP
17:20 Closing Organisers

Proposals for short talks or posters: Submit here.

Registration fee: 0€. Registration is required only for estimating numbers of attendees.

Important dates:

Contact email: If you have any questions, please email us at organisers@cryptoday.pt.

Organisers:

Funding acknowledgements: The Portugal Crypto Day organisers would like to acknowledge the following funded projects for their support in making this workshop a possibility.

Past events: