Biblio

Many cyber-related untoward incidents and multiple instances of a data breach of system are being reported. User identity and its usage for valid entry to system depend upon successful authentication. Researchers have explored many threats and vulnerabilities in a centralized system. It has initiated concept of a decentralized way to overcome them. In this work, we have explored application of Self-Sovereign Identity and Verifiable Credentials using decentralized identifiers over cloud.

At present, the ciphertext-policy attribute based encryption (CP-ABE) has been widely used in different fields of data sharing such as cross-border paperless trade, digital government and etc. However, there still exist some challenges including single point of failure, key abuse and key unaccountable issues in CP-ABE. To address these problems. We propose an accountable CP-ABE mechanism based on block chain system. First, we establish two authorization agencies MskCA and AttrVN(Attribute verify Network),where the MskCA can realize master key escrow, and the AttrVN manages and validates users' attributes. In this way, our system can avoid the single point of failure and improve the privacy of user attributes and security of keys. Moreover, in order to realize auditability of CP-ABE key parameter transfer, we introduce the did and record parameter transfer process on the block chain. Finally, we theoretically prove the security of our CP-ABE. Through comprehensive comparison, the superiority of CP-ABE is verified. At the same time, our proposed schemes have some properties such as fast decryption and so on.

Digital identity is the key to the evolving digital society and economy. Since the inception of digital identity, numerous Identity Management (IDM) systems have been developed to manage digital identity depending on the requirements of the individual and that of organisations. This evolution of IDM systems has provided an incremental process leading to the granting of control of identity ownership and personal data to its user, thus producing an IDM which is more user-centric with enhanced security and privacy. A recently promising IDM known as Self-Sovereign Identity (SSI) has the potential to provide this sovereignty to the identity owner. The Sovrin Network is an emerging SSI service utility enabling self-sovereign identity for all, therefore, its assessment has to be carefully considered with reference to its architecture, working, functionality, strengths and limitations. This paper presents an analysis of the Sovrin Network based on aforementioned features. Firstly, it presents the architecture and components of the Sovrin Network. Secondly, it illustrates the working of the Sovrin Network and performs a detailed analysis of its various functionalities and metrics. Finally, based on the detailed analysis, it presents the strengths and limitations of the Sovrin Network.

Managing identity across an ever-growing digital services landscape has become one of the most challenging tasks for security experts. Over the years, several Identity Management (IDM) systems were introduced and adopted to tackle with the growing demand of an identity. In this series, a recently emerging IDM system is Self-Sovereign Identity (SSI) which offers greater control and access to users regarding their identity. This distinctive feature of the SSI IDM system represents a major development towards the availability of sovereign identity to users. uPort is an emerging open-source identity management system providing sovereign identity to users, organisations, and other entities. As an emerging identity management system, it requires meticulous analysis of its architecture, working, operational services, efficiency, advantages and limitations. Therefore, this paper contributes towards achieving all of these objectives. Firstly, it presents the architecture and working of the uPort identity management system. Secondly, it develops a Decentralized Application (DApp) to demonstrate and evaluate its operational services and efficiency. Finally, based on the developed DApp and experimental analysis, it presents the advantages and limitations of the uPort identity management system.