Daniel Morales

@inproceedings{morales2023jitel,

title = {Cryptographic approaches for confidential computations in blockchain},

author = {Daniel Morales and Isaac Agudo},

isbn = {978-84-09-58148-1},

year  = {2023},

date = {2023-11-09},

booktitle = {XVI Jornadas de Ingenier\'{i}a Telem\'{a}tica},

pages = {110-113},

address = {Barcelona},

abstract = {Blockchain technologies have been widely researched in the last decade, mainly because of the revolution they propose for different use cases. Moving away from centralized solutions that abuse their capabilities, blockchain looks like a great solution for integrity, transparency, and decentralization. However, there are still some problems to be solved, lack of privacy being one of the main ones. In this paper, we focus on a subset of the privacy area, which is confidentiality. Although users are increasingly aware of the importance of confidentiality, blockchain poses a barrier to the confidential treatment of data. We initiate the study of cryptographic confidential computing tools and focus on how these technologies can endow the blockchain with better capabilities, i.e., enable rich and versatile applications while protecting users’ data. We identify Zero Knowledge Proofs, Fully Homomorphic Encryption, and Secure Multiparty Computation as good candidates to achieve this.},

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pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{morales2023metacom,

title = {Integration of MPC into Besu through an extended private transaction model},

author = {Daniel Morales and Isaac Agudo and Javier Lopez},

url = {/wp-content/papers/morales2023metacom.pdf},

doi = {10.1109/MetaCom57706.2023.00056},

year  = {2023},

date = {2023-06-01},

urldate = {2023-06-01},

booktitle = {IEEE International Conference on Metaverse Computing, Networking and Applications},

pages = {266-273},

publisher = {IEEE},

address = {Kyoto, Japan},

organization = {IEEE Computer Society},

abstract = {In the last few years we have seen many different approaches to incorporate privacy features to blockchains. In the area of cryptocurrencies that would normally mean protecting the identity of the owner of some funds, but there are other applications where privacy is even more important, especially in permissioned blockchains. 

Permissioned blockchain platforms, such as Hyperledger Besu or Hyperledger Fabric, already include the concept of private transactions, which essentially defines a sub-group of the blockchain where their participants share some private data. 

We want to go one step ahead and propose an extended model for private transactions where the different participants can have a separated view of the same transaction, allowing the integration of Multi-party Computation protocols in the blockchain. 

Our work extends Hyperledger Besu’s design for private transactions, offering better security properties and a finer grain customization. We cover two specific MPC examples, Private Set Intersection and Byzantine Fault-Tolerant Random Number Generation, and propose a mechanism to run them using smart contract interfaces.},

keywords = {},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{morales2022cc,

title = {Real-time Crowd Counting based on Wearable Ephemeral IDs},

author = {Daniel Morales and Isaac Agudo and Javier Lopez},

url = {/wp-content/papers/morales2022cc.pdf},

doi = {10.5220/0011327200003283},

issn = {2184-7711},

year  = {2022},

date = {2022-07-01},

urldate = {2022-07-01},

booktitle = {19th International Conference on Security and Cryptography (SECRYPT 2022)},

pages = {249-260},

publisher = {Scitepress},

address = {Lisbon},

organization = {Scitepress},

abstract = {Crowd Counting is a very interesting problem aiming at counting people typically based on density averages and/or aerial images. This is very useful to prevent crowd crushes, especially on urban environments with high crowd density, or to count people in public demonstrations. In addition, in the last years, it has become of paramount importance for pandemic management. For those reasons, giving users automatic mechanisms to anticipate high risk situations is essential. In this work, we analyze ID-based Crowd Counting, and propose a real-time Crowd Counting system based on the Ephemeral ID broadcast by contact tracing applications on wearable devices. We also performed some simulations that show the accuracy of our system in different situations.},

keywords = {},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{morales2019,

title = {Prueba de concepto de Autoridad de Certificaci\'{o}n usando Computaci\'{o}n Segura Multiparte},

author = {Daniel Morales and Isaac Agudo},

url = {/wp-content/papers/morales2019.pdf},

doi = {10.26754/uz.978-84-09-21112-8},

isbn = {978-84-09-21112-8},

year  = {2019},

date = {2019-10-01},

urldate = {2019-10-01},

booktitle = {XIV Jornadas de Ingenier\'{i}a Telem\'{a}tica},

pages = {50-53},

address = {Zaragoza},

abstract = {Este trabajo pretende analizar el paradigma de la Computaci\'{o}n Segura Multiparte y sus posibles aplicaciones en el campo de la criptograf\'{i}a. Se plantea como modelo alternativo, mas escalable y seguro al uso de m\'{o}dulos hardware de seguridad para aplicaciones que requieran de Terceras Partes Confiables. Concretamente, se ha integrado un protocolo de criptograf\'{i}a RSA multiparte con la librer\'{i}a certbuilder, para la creaci\'{o}n de certificados X.509. De esta forma se asegura que la creaci\'{o}n de los certificados ra\'{i}z de la Infraestructura de Clave Publica se realiza de forma que la generaci\'{o}n de claves y firma de este se ejecute \'{i}ntegramente sobre el sistema multiparte, con un modelo de tres partes que trabaja con circuitos aritm\'{e}ticos, sin que ninguna de ellas, de forma aislada, tenga posibilidad de comprometer la clave privada correspondiente. Para comprobar la viabilidad del sistema se han realizado pruebas de generaci\'{o}n de certificados con diferentes longitudes de clave, siendo el proceso determinante la creaci\'{o}n de las claves. Los elevados tiempos hacen que una aplicaci\'{o}n como esta no sea asumible en otros escenarios, pero creemos que para el caso de la creaci\'{o}n de los certificados ra\'{i}z de una infraestructura de clave p\'{u}blica las garant\'{i}as avanzadas de seguridad compensan el tiempo extra.},

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pubstate = {published},

tppubtype = {inproceedings}

}