• The Journal of Korean Association of Computer Education
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• v.15 no.1
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• pp.73-85
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• 2012

Presently, Enhanced electronic financial service are offered used open network due to development of IT and financial transactions. The protocol in this environments such as SET, SSL/TLS, and so on are electronic transaction protocol to perform electronic payment securely and efficiently. However, most users still does not know accurately how to use and potential problems. It especially has key management problem about generate session key for purchase products or payment. To solve this problem, we propose proxy re-encryption based secure electronic transaction to transmit payment and order information without addition session key.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.10a
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• pp.258-261
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• 2016

환자가 가정에서 네트워크를 통해 자신의 건강정보를 원격지에 위치한 의사에게 전송하여 이에 대한 진단을 받는 원격건강정보 모니터링 시스템에서 환자의 개인건강정보의 보호는 매우 중요한 과제이다. 본 논문에서는 신원기반 프록시 재암호화 기법을 사용하여 환자가 다수의 의사를 선택하여 각 의사들에게 개인건강정보를 전송하여 진단을 받는 환경을 가정하여 환자가 가지는 연산부담을 줄이기 위해 환자의 비밀키로 생성한 암호문을 프록시가 재암호화하여 의사가 가진 비밀키로 복호화 할 수 있도록 하는 기법을 제안한다.

• KIPS Transactions on Computer and Communication Systems
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• v.6 no.4
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• pp.197-202
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• 2017

The remote healthcare monitoring system enables a doctor to diagnose and monitor patient's health problem from a distance. Previous researches have focused on key establishment method between a patient and a particular doctor to solve personal health information disclosure problem in data transmission process. However, when considering a misdiagnosis of doctor, the result of a diagnosis by a many doctors is more reliable. In previous work, in order to select multiple doctors, patient should generate shared key for each chosen doctor and perform many times encryptions. Therefore, in this paper, we propose a secure data transmission protocol for receiving diagnosis from multiple doctors using identity-based proxy re-encryption scheme. In proposed protocol, a patient don't need key management work for session key. Also, monitoring server performs re-encryption process on behalf of patient. So, we can reduce computational burden of patient in previous work.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.05a
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• pp.153-154
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• 2018

CCTV는 현재에도 다양한 분야에서 적용되어 활용하고 있다. 하지만 다양한 분야에 설치된 CCTV 시스템에는 다양한 보안 위협이 존재하는데, 공격자는 전송되는 영상데이터를 획득함으로써 카메라에 찍은 사용자의 정보를 획득할 수 있고, 이를 조작하여 사회에 혼란을 줄 수도 있다. 또한 다수의 카메라의 영상을 보관하는 서버가 공격자에 의해 해킹당하면 다수의 카메라는 공격자에 의해 제어 될 수 있다. 본 논문에서는 CCTV의 보안위협을 해결하고자 CCTV 환경에서 프록시 재암호화를 활용하여 키관리를 함으로써 서버에 저장된 영상을 재암호화하고 원하는 사용자가 암호화된 영상을 획득하여 자신의 비밀키만으로 영상을 안전하게 복호화하여 획득할 수 있다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.31 no.6
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• pp.1157-1169
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• 2021

The disaster recovery refers to policies and procedures to ensure continuity of services and minimize loss of resources and finances in case of emergency situations such as natural disasters. In particular, the disaster recovery method by the cloud service provider has advantages such as management flexibility, high availability, and cost effectiveness. However, this method has a dependency on a service provider and has a structural limitation in which a user cannot be involved in personal data. In this paper, we propose a protocol using proxy re-encryption for data confidentiality by removing dependency on service providers by backing up user data using blockchain and distributed storage. The proposed method is implemented in Ethereum and IPFS environments, and presents the performance and cost required for backup and recovery operations.

• Journal of the Korea Society of Computer and Information
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• v.18 no.9
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• pp.79-89
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• 2013

Recently, the need for outsourcing sensitive data has grown due to the wide spreading of cost-effective and flexible cloud service. However, there is a fundamental concern in using such service since users have to trust external servers. Therefore, searchable encryption can be a very valuable tool to meet the security requirements of data outsourcing. However, most of work on searchable encryption focus only on privacy preserving search function and relatively lacks research on encryption mechanism used to actually encrypt data. Without a suitable latter mechanism, searchable encryption cannot be deployed in real world cloud services. In this paper, we analyze previously used and possible data encryption mechanisms for multi-user searchable encryption system and discuss their pros and cons. Our results show that readily available tools such as broadcast encryption, attribute-based encryption, and proxy re-encryption do not provide suitable solutions. The main problem with existing tools is that they may require separate fully trusted servers and the difficulty in preventing collusion attacks between outsiders and semi-trusted servers.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.4B
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• pp.288-299
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• 2012

To ensure data confidentiality and fine-grained access control in business environment, system model using KP-ABE(Key Policy-Attribute Based Encryption) and PRE(Proxy Re-Encryption) has been proposed recently. However, in previous study, data confidentiality has been effected by decryption right concentrated on cloud server. Also, Yu's work does not consider a access privilege management, so existing work become dangerous to collusion attack between malicious user and cloud server. To resolve this problem, we propose secure system model against collusion attack through dividing data file into header which is sent to privilege manager group and body which is sent to cloud server and prevent modification attack for proxy re-encryption key using d Secret Sharing, We construct protocol model in medical environment.