• KSII Transactions on Internet and Information Systems (TIIS)
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• v.17 no.11
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• pp.3182-3203
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• 2023

With the growing adoption of cloud-based technologies, maintaining the privacy and security of cloud data has become a pressing issue. Privacy-preserving encryption schemes are a promising approach for achieving cloud data security, but they require careful design and implementation to be effective. The integrated approach to cloud data security that we suggest in this work uses CogniGate: the orchestrated permissions protocol, index trees, blockchain key management, and unique Opacus encryption. Opacus encryption is a novel homomorphic encryption scheme that enables computation on encrypted data, making it a powerful tool for cloud data security. CogniGate Protocol enables more flexibility and control over access to cloud data by allowing for fine-grained limitations on access depending on user parameters. Index trees provide an efficient data structure for storing and retrieving encrypted data, while blockchain key management ensures the secure and decentralized storage of encryption keys. Performance evaluation focuses on key aspects, including computation cost for the data owner, computation cost for data sharers, the average time cost of index construction, query consumption for data providers, and time cost in key generation. The results highlight that the integrated approach safeguards cloud data while preserving privacy, maintaining usability, and demonstrating high performance. In addition, we explore the role of differential privacy in our integrated approach, showing how it can be used to further enhance privacy protection without compromising performance. We also discuss the key management challenges associated with our approach and propose a novel blockchain-based key management system that leverages smart contracts and consensus mechanisms to ensure the secure and decentralized storage of encryption keys.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2002.11a
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• pp.298-301
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• 2002

다중레벨보안은 하나의 시스템 내에 여러 보안등급의 데이터와 사용자를 수용하여 효율성을 높이기 위한 것이다. 본 논문에서는 네트워크를 통해서 여러 보안등급의 데이터가 저장된 디렉토리 서버에 다중레벨의 사용자들의 접근을 통제하기위한 방안을 제시하고 구현한다. 보안과 무결성 모두를 보장해주기 위해서 보안 모델과 무결성 모델을 결합한 새로운 형태의 모델을 정의한다. 이 모델을 OpenLDAP의 ACL(Access Control List)을 사용하여 구현하고 사용자의 등급에 따른 시스템의 접근통제를 가능하게 한다.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2001.11a
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• pp.33-38
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• 2001

역할기반 접근제어(RBAC : Role Based Access Control)는 임의적 접근제어와 강제적 접근제어에 비해 견고함과 유연성을 제공한다. 따라서 RBAC은 최근 금융시스템 및 병원시스템 등에서 많은 관심의 대상이 되고 있다. 본 논문에서는 안전성이 인증된 다중등급보안(MLS : Multi-Level Security) 리눅스를 이용하여 인터넷상에서 가상은행의 금융업무를 안전하게 처리할 수 있는 다중등급기반의 RBAC 시스템을 구현함을 보인다.

• Convergence Security Journal
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• v.2 no.1
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• pp.59-68
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• 2002

The smart card including memory and processor is able to simple process such as privilege unauthorized access and used to Authentication System for security. In this paper, we propose using the smart card in the key exchange phase when secure Internet phones conversation, so certainly guarantee to mutual authentication and secret communication.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.46 no.1
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• pp.78-87
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• 2009

An attribute-based signature scheme is a signature scheme where a signer's private key is associate with an attribute set and a signature is associated with an access structure. Attribute-based signature schemes are useful to provide anonymity and access control for role-based systems and attribute-based systems where an identity of object is represented as a set of roles or attributes. In this paper, we formally define the definition of attribute-based signature schemes and propose the first efficient attribute-based signature scheme that requires constant number of pairing operations for verification where a policy is represented as a disjunctive normal form (DNF). To construct provably secure one, we introduce a new interactive assumption and prove that our construction is secure under the new interactive assumption and the random oracle model.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.22 no.6
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• pp.1355-1362
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• 2012

As the utilization of cloud computing service rapidly increases to meet demands for various forms of service recently, the virtualization technology has made a rapid rise, further leading to some issues related to security, such as safety and reliability. As a system to provide environments what multiple virtual operating systems can be loaded, hypervisors may be a target of various attacks, such as control loss and authority seizure, since all the agents fcan be damaged by a malicious access to the virtualization layer. Therefore, this paper was conducted to investigate the access control for agents and suggest a plan to control malicious accesses to the cloud virtualization internal environment. The suggested technique was verified not to have effect on the performance of the system and environment through an analysis of its performance.

• The Transactions of the Korea Information Processing Society
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• v.6 no.11S
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• pp.3278-3288
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• 1999

This paper proposes a security platform, called SCAP(Security platform for CORBA based APplication), to cope with potential threats in a distributed object system. SCAP supports CORBA security specification announced by OMG. SCAP is comprised of four functional blocks, which co-work with ORB to provide security services: Authentication Block, Association Block, Access Control Block, and Security Information Management Block. It is designed to support Common Secure Interoperability Functionality Level 2, which is useful for large-scale intra-, or inter-network based applications. Actual security services, which are dependent on supporting security technology, will be provided as external security service for replace ability. Implementation issues such as how to simulate an interceptor mechanism using a commercial ORB product without source code, and how to extend Current object required for security services are also described. At the end of the paper, the SCAP applied to the web environment is described to show its practical utilization.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11c
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• pp.1737-1740
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• 2003

There are many security problems in the electronic payment system because it is built into the open network. Security problems include both system penetrations from outside and unauthorized access by the inside. Nevertheless, the integrity of messages can be guaranteed through a transfer message with the SEED and HASH encryption algorithm. This paper demonstrates how electronic payment system messages and the information they contain can be made safeguarded using the SEED and HASH encryption algorithm, even when there may be some information loss.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.9
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• pp.1955-1962
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• 2012

Recently the flow of information security has become a user-centered change. This is mostly breach of security by the normal and abnormal entering harmful files during user internet. Therefore, we would like to design security system that breach of security can be prevented in advance to improve using the reliability of DNS and system control in this paper. In other words, we would like to suggest method can be block randomly to access the site which information security system of user-centric is breached harmful files infected in user computer.

• Journal of Korea Spatial Information System Society
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• v.2 no.1 s.3
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• pp.83-90
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• 2000

According to the development of Internet system recently, we focused in GIS data distribution and applications via internet rather than GIS data construction. Therefore in this paper, we present the necessity of security policy on GTS data. So we analyze the actual condition of GIS data through expert poll. We classify all of data used in GIS with the three security level : high level, middle level, low level. Finally we propose the proper security method on GIS data transfer and on GIS database access in accordance with progree of PKI project.