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Department of Information Technology, FCSIT, Bayero University Kano, Kano, Nigeria, Department of Computer Science, Faculty of Science, University of Porto, Porto, Portugal

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2 Papers

A Decentralised Real Estate Transfer Verification based on Self-Sovereign Identity and Smart Contracts

Topics: Identity Management; Identification, Authentication and Non-Repudiation; Access Control; Blockchains Security

Authors: Abubakar-Sadiq Shehu ^{1

;

2} , António Pinto ³ and Manuel E. Correia ^{3

;

1}

Affiliations: ¹ Department of Computer Science, Faculty of Science, University of Porto, Porto, Portugal , ² Department of Information Technology, FCSIT, Bayero University Kano, Kano, Nigeria , ³ CRACS & INESC TEC, Porto, Portugal

Digital Object Identifier: 10.5220/0011384700003283

Proceedings of SECRYPT 2022, ISBN: 978-989-758-590-6

Quick Abstract

Since its first introduction in late 90s, the use of marketplaces has continued to grow, today virtually everything from physical assets to services can be purchased on digital marketplaces, real estate is not an exception. Some marketplaces allow acclaimed asset owners to advertise their products, to which the services gets commission/percentage from proceeds of sale/lease. Despite the success recorded in the use of the marketplaces, they are not without limitations which include identity and property fraud, impersonation and the use of centralised technology with trusted parties that are prone to single point of failures (SPOF). Being one of the most valuable assets, real estate has been a target for marketplace fraud as impersonators take pictures of properties they do not own, upload them on marketplace with promising prices that lures innocent or naive buyers. This paper addresses these issues by proposing a self sovereign identity (SSI) and smart contract based framework for identity verification and verified transaction management on secure digital marketplaces. First, the use of SSI technology enable methods for acquiring verified credential (VC) that are verifiable on a decentralised blockchain registry to identify both real estate owner(s) and real estate property. Second, the smart contracts are used to negotiate the secure transfer of real estate property deeds on the marketplace. To assess the viability of our proposal we define an application scenario and compare our work with other approaches.

Providing Secured Access Delegation in Identity Management Systems

Topic: Access Control

Authors: Abubakar-Sadiq Shehu ¹ , António Pinto ² and Manuel E. Correia ³

Affiliations: ¹ Department of Information Technology, FCSIT, Bayero University Kano, Kano, Nigeria, Department of Computer Science, Faculty of Science, University of Porto, Porto, Portugal , ² CRACS & INESC TEC, Porto, Portugal , ³ Department of Computer Science, Faculty of Science, University of Porto, Porto, Portugal, CRACS & INESC TEC, Porto, Portugal

Digital Object Identifier: 10.5220/0009892206380644

Proceedings of SECRYPT 2020, ISBN: 978-989-758-446-6

Quick Abstract

The evolutionary growth of information technology has enabled us with platforms that eases access to a wide range of electronic services. Typically, access to these services requires users to authenticate their identity, which involves the release, dissemination and processing of personal data by third parties such as service and identity providers. The involvement of these and other entities in managing and processing personal identifiable data has continued to raise concerns on privacy of personal information. Identity management systems (IdMs) emerged as a promising solution to address major access control and privacy issues, however most research works are focused on securing service providers (SPs) and the services provided, with little emphases on users privacy. In order to optimise users privacy and ensure that personal information are used only for intended purposes, there is need for authorisation systems that controls who may access what and under what conditions. However, for adoption data owners perspective must not be neglected. To address these issues, this paper introduces the concept of IdM and access control framework which operates with RESTful based services. The proposal provides a new level of abstraction and logic in access management, while giving data owner a decisive control over access to personal data using smartphone. The framework utilises Attribute based access control (ABAC) method to authenticate and authorise users, Open ID Connect (OIDC) protocol for data owner authorisation and Public-key cryptography to achieve perfect forward secrecy communication. The solution enables data owner to attain the responsibility of granting or denying access to their data, from a secured communication with an identity provider using a digitally signed token.