Browsing by Author "Seco, Iñaki"
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Item A Blockchain-Based Audit Trail Mechanism: Design and Implementation: Design and implementation(2021-11-26) Regueiro, Cristina; Seco, Iñaki; Gutiérrez-Agüero, Iván; Urquizu, Borja; Mansell, Jason; Tecnalia Research & Innovation; CIBERSEC&DLTAudit logs are a critical component in today’s enterprise business systems as they provide several benefits such as records transparency and integrity and security of sensitive information by creating a layer of evidential support. However, current implementations are vulnerable to attacks on data integrity or availability. This paper presents a Blockchain-based audit trail mechanism that leverages the security features of Blockchain to enable secure and reliable audit trails and to address the aforementioned vulnerabilities. The architecture design and specific implementation are described in detail, resulting in a real prototype of a reliable, secure, and user-friendly audit trail mechanism.Item Privacy-enhancing distributed protocol for data aggregation based on blockchain and homomorphic encryption(2021-11) Regueiro, Cristina; Seco, Iñaki; de Diego, Santiago; Lage, Oscar; Etxebarria, Leire; CIBERSEC&DLT; Tecnalia Research & InnovationThe recent increase in reported incidents of security breaches compromising users' privacy call into question the current centralized model in which third-parties collect and control massive amounts of personal data. Blockchain has demonstrated that trusted and auditable computing is possible using a decentralized network of peers accompanied by a public ledger. Furthermore, Homomorphic Encryption (HE) guarantees confidentiality not only on the computation but also on the transmission, and storage processes. The synergy between Blockchain and HE is rapidly increasing in the computing environment. This research proposes a privacy-enhancing distributed and secure protocol for data aggregation backboned by Blockchain and HE technologies. Blockchain acts as a distributed ledger which facilitates efficient data aggregation through a Smart Contract. On the top, HE will be used for data encryption allowing private aggregation operations. The theoretical description, potential applications, a suggested implementation and a performance analysis are presented to validate the proposed solution.Item Semi-real-time hash comparison for detecting intrusions using blockchain(Springer Science and Business Media Deutschland GmbH, 2019) Serrano, Oscar Lage; de Diego de Diego, Santiago; Seco, Iñaki; Larrucea, Xabier; Attiogbé, Christian; Ferrarotti, Flavio; Maabout, Sofian; CIBERSEC&DLT; Tecnalia Research & InnovationThis paper proposes an extensible Blockchain-Based Industrial Anomaly Detection (BIAD) system for industrial scenarios. This approach is to use Blockchain to prevent a set of attacks at semi-real time by comparing logs. Besides, this solution regards attacker firmware modifications following the same comparison principle within the same infrastructure.Item Towards Cost-Efficient Management for Power Purchase Agreements Using Blockchain Technology(Springer Science and Business Media Deutschland GmbH, 2023) Gutierrez-Aguero, Ivan; Bravo, Yesnier; Landa, Daniel; Lage, Oscar; Seco, Iñaki; Castillo, Aitor; Prieto, Javier; Benítez Martínez, Francisco Luis; Ferretti, Stefano; Arroyo Guardeño, David; Tomás Nevado-Batalla, Pedro; CIBERSEC&DLT; SWTThe difficulty for two parties to efficiently manage the contract conditions and clauses defined in a Power Purchase Agreement introduces several challenges. This manuscript addresses the current management limitations that arise during its lifecycle and offers a new vision adequate to the business implications, the need of transparency and the requirements of edge computing continuous monitoring. Considering the relevant actors, the main scenarios driven by the Power Purchase Agreements and their state-of-the-art contract designs, this manuscript proposes a novel method and procedure to enhance the cost-efficiency of the installations, granting the consumer self-management and the confidence and the guarantee of origin through a trustworthy distributed solution. The method proposed enables total traceability and integrity on the PPA performance in the long-term by applying blockchain technology. A new operational design is proposed, explaining the energy balance and energy cost formulas required by businesses. The results show that blockchain enhances the way of managing data, the data ownership, and the market opportunity.