Riccardo Longo

Riccardo Longo Researcher

Riccardo Longo is a Researcher in the Applied Cryptography (ALEPH) unit of the Center for Cybersecurity of Fondazione Bruno Kessler.His Alma Mater is the University of Trento, where he received the BSc degree in Mathematics in September 2012 with a thesis on Game Theory, the MSc in October 2014 with a thesis on Attribute-Based Encryption, and the PhD in Mathematics in March 2018 with a thesis on Provable Security of Cryptographic Protocols.

He briefly worked as a Cybersecurity consultant for GDPR compliance before returning in June 2019 to UniTN as a postdoctoral researcher, working on Blockchains, Threshold Signatures, E-Voting and other cryptographic protocols, first with Prof. Massimiliano Sala (who also supervised his MSc and PhD theses) and then with Prof. Silvio Ranise. In June 2023, he moved to the newborn Applied Cryptography (ALEPH) research unit of Fondazione Bruno Kessler. He has been a Teaching Assistant for the Mathematics master degree course “Algebraic Cryptography” at the University of Trento, and since 2020 he is TA for the Mathematics and Computer Science master degree courses “Applied Cryptography” and “Advanced Programming of Cryptographic Methods”. Since 2018 he teaches the Cryptography course in the “Alta Formazione” (post-diploma) degree offered by Istituto Tecnico Tecnologico Marconi of Rovereto.

His research focuses on cryptographic protocols and their provable security via security games and reductions to hardness assumptions on mathematical problems.

Publications in ALEPH

2024 (4)

  • Riccardo Longo, Chiara Spadafora
    Amun: Securing E-Voting Against Over-the-Shoulder Coercion
    In: 21st International Conference on Security and Cryptography (SECRYPT 2024) (DOI)
    Privacy Enhancing Cryptography Zero-Knowledge Proof
  • Laura Cristiano, Riccardo Longo, Chiara Spadafora
    Click and Cast - Assessing the Usability of Vote App
    In: Ninth International Joint Conference on Electronic Voting (E-Vote-ID 2024) (DOI)
    E-Voting
  • Riccardo Longo, Majid Mollaeefar, Umberto Morelli, Chiara Spadafora, Alessandro Tomasi, Silvio Ranise
    Modeling and Assessing Coercion Threats in Electronic Voting
    In: 19th International Conference on Risks and Security of Internet and Systems (CRISIS 2024) (complementary material)
    E-Voting Decentralization of Trust Threat Modelling Risk Analysis
  • Marco Calderini, Riccardo Longo, Massimiliano Sala, Irene Villa
    Searchable encryption with randomized ciphertext and randomized keyword search
    In: Journal of Mathematical Cryptology (JMC), Volume 18, Issue 1 (DOI)
    Cryptographic Access Control Cloud Computing Privacy Enhancing Cryptography

2023 (1)

  • Matteo Bitussi, Riccardo Longo, Francesco Antonio Marino, Umberto Morelli, Amir Sharif, Chiara Spadafora, Alessandro Tomasi
    Coercion-resistant i-voting with short PIN and OAuth 2.0
    In: Eighth International Joint Conference on Electronic Voting (E-Vote-ID 2023) (DOI)
    Threshold Cryptography Zero-Knowledge Proof Secure Multi-Party Computation Privacy Enhancing Cryptography Decentralization of Trust E-Voting

Current Projects

Dissemination

2025

  • February 3- 8, 2025 • Academic
    Riccardo Longo, Enrico Sorbera, Valeria Vicard
    MK-SEAC: Multi-Keyword Searchable Encryption with Access Control
    Italian Conference on CyberSecurity (ITASEC) 2025 (Event, Project)

2024

  • February 22-March 14, 2024 • Outreach
    Chiara Spadafora, Riccardo Longo, Laura Cristiano, Vincenzo Desantis, Francesco Antonio Marino, Silvio Ranise, Alessandro Tomasi
    Come il voto elettronico può migliorare la società - Ciclo di seminari
    Incontri sul voto elettronico (Event, Project)

2023

  • December 14-15, 2023 • Academic
    Riccardo Longo, Chiara Spadafora, Francesco Antonio Marino
    Vote app: Verifiable and coercion-resistant i-voting
    Topics in Applied Cryptography - Co-Located with CIFRIS23 (Conference, Workshop)
  • September 29, 2023 • Outreach
    Umberto Morelli, Chiara Spadafora, Riccardo Longo, Matteo Bitussi, Laura Cristiano, Vincenzo Desantis, Alessandro Tomasi
    Dammi 3 parole: sole, voto, o ombrellone
    Notte della Ricerca 2023 (Event, Project)
  • May 3- 5, 2023 • Academic
    Laura Cristiano, Vincenzo Desantis, Riccardo Longo, Francesco Antonio Marino, Umberto Morelli, Chiara Spadafora, Alessandro Tomasi, Silvio Ranise
    To i-vote or not to i-vote? Interdisciplinary interim lessons learned from a research project
    Italian Conference on CyberSecurity (Conference)

Supervised Theses

2024

  • Valeria Vicard (Master's Thesis, University of Udine, 2024)
    Searchable Encryption and Attributed-based encryption: theoretical and practical aspects
    Supervisors: Marino Miculan | Co-supervisors: Riccardo Longo
  • Sara Montanari (Master's Thesis, University of Trento, 2024)
    Refreshable and Extensible Verifiable Decentralized Secret Sharing for Threshold Access Trees
    Supervisors: Alessio Meneghetti | Co-supervisors: Riccardo Longo
  • Luca Claus (Bachelor's Thesis, University of Trento, 2024)
    End-to-End Protection for Data Sharing Among Organizations in Cloud-Managed Blockchain Applications
    Supervisors: Silvio Ranise | Co-supervisors: Stefano Berlato, Riccardo Longo