6 papers
Hello, won't you tell me your name?: Investigating Anonymity Abuse in IPFS
Christos Karapapas, Iakovos Pittaras, George C. Polyzos +1
The InterPlanetary File System~(IPFS) offers a decentralized approach to file storage and sharing, promising resilience and efficiency while also realizing the Web3 paradigm. Simul…
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…
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…
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…