Browsing by Author "Coskun, Vedat"

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A Blockchain-Enhanced Self-Sovereign Identity Platform for Corporate Resource Security
(Видавництво Львівської політехніки, 2023-02-28) Kose, Busra Ozdenizci; Coskun, Vedat; Coskun, Arslan; Yaya, Senol; Gebze Technical University; Istanbul Atlas University; Turcom Technology
In an era dominated by concerns of data breaches, and identity theft, security of corporate resources and assets has become paramount. Centralized identity management systems traditionally present vulnerabilities that can fundamentally threaten corporate security. This paper introduces a novel platform to identity management in organizations, leveraging the principles of Self-Sovereign Identity (SSI) and the technological robustness of blockchain. By giving individuals unwavering control over their digital identities and reducing dependence on centralized intermediaries, SSI provides a transformative advancement in security and privacy. When combined with blockchain's immutable, decentralized, and transparent nature, this model ensures a verifiable, tamper-proof, and holistic identity management system. Beyond individual identity management, this paradigm provides corporations with a robust mechanism to protect their assets, both digital and physical. We explore the architectural design and benefits of implementing the proposed system, BlockSSI-CRS, emphasizing its transformative potential for corporate resource protection. Through rigorous analysis, this paper highlights the feasibility of a blockchain-enhanced SSI platform in the context of corporate security needs.
A secure design on mifare classic cards for ensuring contactless payment and control services
(Видавництво Львівської політехніки, 2022-06-06) Kose, Busra Ozdenizci; Uluoz, Hakan; Coskun, Vedat; Gebze Technical University, Kocaeli, Turkey; Konfides Information Technologies, Istanbul, Turkey; Beykent University, Istanbul, Turkey
Today, various contactless smart cards are used to protect our personal information and to perform secure and fast transactions. Many contactless smart card applications are becoming commonplace, from corporate access control cards to electronic passports and financial payment. There is a wide variety of smart cards on the market that differ in size, chasis, memory, computing power, and even the security features they provide. Although MIFARE Classic cards, which are used in many areas due to their price performance, meet certain security and functional needs, the weaknesses of these cards have made the applications and systems they are used in question. The aim of this study is to introduce a new design on MIFARE Classic contactless cards that will eliminate the basic shortcomings with minimum impact, and to perform high-security payment transactions using these cards, which do not support high-security payment transactions in their basic design. By using flexible data organization and storage scheme, their sector structure can be used for different purposes. The proposed new design includes derivation of critical card data by using cardspecific information which ensures that the keys that provide access to the sectors of card are different on all cards; protection of card information through a certificate mechanism; usage of a new data structure with mirroring and redundancy methods to ensure data integrity and provide a server-side authentication mechanism for online transactions. It is possible that the proposed new design will pave the way for the secure use of MIFARE Classic cards in new generation payment and control systems.
Enhancing SIM Card Technology: Developing an Advanced Operating System
(Видавництво Львівської політехніки, 2023-02-28) Kose, Busra Ozdenizci; Sardag, Alp; Coskun, Vedat; Mantar, Ali; Gebze Technical University; Omreon; Atlas University
The emergence of smart cards is a significant achievement in the field of information technology. They are growing in importance as they offer secure data storage and authentication, improve security, simplify processes, reduce costs, and have a variety of applications. In particu- lar, nowadays SIM cards play a vital role in the Telecom industry as an important type of smart card that allows a user to make calls, send messages, store details such as phone number and network authentication information, and provide various mobile data services. Currently, some leading companies take advantage of having their own smart card operating systems and have significant impact on the market on various issues (hardware on which the smart card operating system will run; security restrictions; control, permission and control of any application, etc.). It is important to work on creating a more flexible, adaptable and secure operating system infrastructure in order to overcome these limitations both in the customer perspective and in the ecosystem. The purpose of this research is to introduce the creation of a special Java Card operating system designed for SIM cards used in the Telecom industry. The study presents the software requirements and development steps of the proposed operating system and innovative architectural components necessary for its operation as a SIM card beyond being a Java Card operating system. The proposed new Java Card based SIM operating system is expected to pave the way for the development of eSIM operating system infrastructure as well as 5G tech- nology and offer valuable opportunities.