8 citations · 22 across the 17 of their papers we have counts for
15 papers · 1 filter
Improving the Security of Containerized Workloads using Transparency and Traceability Services
Nikos Fotiou, Lefteris Georgiadis, Ignacio Lacalle +2
Containerized workloads are commonly built via CI/CD pipelines, stored in registries, and executed across heterogeneous infrastructures, including cloud and edge environments. A si…
Identity and Access Management for the Computing Continuum
Chalima Dimitra Nassar Kyriakidou, Athanasia Maria Papathanasiou, Vasilios A. Siris +4
The computing continuum introduces new challenges for access control due to its dynamic, distributed, and heterogeneous nature. In this paper, we propose a Zero-Trust (ZT) access c…
did:self A registry-less DID method
Nikos Fotiou, George C. Polyzos, Vasilios A. Siris
We introduce did:self, a Decentralized Identifier (DID) method that does not depend on any trusted registry for storing the corresponding DID documents. Information for authenticat…
Access control for Data Spaces
Nikos Fotiou, Vasilios A. Siris, George C. Polyzos
Data spaces represent an emerging paradigm that facilitates secure and trusted data exchange through foundational elements of data interoperability, sovereignty, and trust. Within…
Authentication, Authorization, and Selective Disclosure for IoT data sharing using Verifiable Credentials and Zero-Knowledge Proofs
Nikos Fotiou, Iakovos Pittaras, Spiros Chadoulos +4
As IoT becomes omnipresent vast amounts of data are generated, which can be used for building innovative applications. However,interoperability issues and security concerns, preven…
Enabling self-verifiable mutable content items in IPFS using Decentralized Identifiers
Nikos Fotiou, Vasilios A. Siris, George C. Polyzos
In IPFS content identifiers are constructed based on the item's data therefore the binding between an item's identifier and its data can be deterministically verified. Nevertheless…
Capability-based access control for multi-tenant systems using OAuth 2.0 and Verifiable Credentials
Nikos Fotiou, Vasilios A. Siris, George C. Polyzos
We propose a capability-based access control technique for sharing Web resources, based on Verifiable Credentials (VCs) and OAuth 2.0. VCs are a secure means for expressing claims…
Ransomware as a Service using Smart Contracts and IPFS
Christos Karapapas, Iakovos Pittaras, Nikos Fotiou +1
Decentralized systems, such as distributed ledgers and the InterPlanetary File System (IPFS), are designed to offer more open and robust services. However, they also create opportu…
OAuth 2.0 authorization using blockchain-based tokens
Nikos Fotiou, Iakovos Pittaras, Vasilios A. Siris +2
OAuth 2.0 is the industry-standard protocol for authorization. It facilitates secure service provisioning, as well as secure interoperability among diverse stakeholders. All OAuth…
Exploiting Satellite Broadcast despite HTTPS
Nikos Fotiou, Vasilios A Siris, George C. Polyzos +3
HTTPS enhances end-user privacy and is often preferred or enforced by over-the-top content providers, but renders inoperable all intermediate network functions operating above the…
Enabling Opportunistic Users in Multi-Tenant IoT Systems using Decentralized Identifiers and Permissioned Blockchains
Nikos Fotiou, Iakovos Pittaras, Vasilios A. Siris +1
In this work, we leverage advances in decentralized identifiers and permissioned blockchains to build a flexible user authentication and authorization mechanism that offers enhance…
Secure IoT access at scale using blockchains and smart contracts
Nikos Fotiou, Iakovos Pittaras, Vasilios A. Siris +2
Blockchains and smart contracts are an emerging, promising technology, that has received considerable attention. We use the blockchain technology, and in particular Ethereum, to im…
OAuth 2.0 meets Blockchain for Authorization in Constrained IoT Environments
Vasilios A. Siris, Dimitrios Dimopoulos, Nikos Fotiou +2
We present models for utilizing blockchain and smart contract technology with the widely used OAuth 2.0 open authorization framework to provide delegated authorization for constrai…
Interacting with the Internet of Things using Smart Contracts and Blockchain Technologies
Nikos Fotiou, Vasilios A. Siris, George C. Polyzos
Despite technological advances, most smart objects in the Internet of Things (IoT) cannot be accessed using technologies designed and developed for interacting with powerful Intern…
Securing Content Sharing over ICN
Nikos Fotiou, George C. Polyzos
The emerging Information-Centric Networking (ICN) paradigm is expected to facilitate content sharing among users. ICN will make it easy for users to appoint storage nodes, in vario…