• The Journal of Korean Association of Computer Education
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• v.8 no.1
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• pp.65-72
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• 2005

In this study, we suggest a new mechanism on the design and implementation of IP Traceback system against DDos/DRDoS by Zombie and Reflector attack based on spoofed IP packets. After analysis and comparing on the state-of-arts of several IP traceback mechanisms, we can find their own pros and cons primitives. And then we performed simulations on reflector based DRDoS network packets. In first, we suggest a NS-2 based IP traceback module and implement it for finding its real DRDoS attacker. As a results, we can find advanced new IP traceback scheme for providing enhanced proactive functionality against DRDoS attack.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.219-222
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• 2013

The Side Channel attack methods proposed by P.Kocher are mainly used for cryptanalysis different cipher algorithms even though they are claimed to be strongly secured. Those kinds of attacks depend on environment implementation especially on the hardware implementation of the algorithm to the crypto module. side-channel attacks are a type of attack introduced by P.Kocher and is applicable according to each environment or method that is designed. This kind of attack can analyze and also extract important information by reading the binary code data via measurement of changes in electricity(voltage) consumption, running time, error output and sounds. Thus, in this paper, we discuss recent SPA and DPA attacks as well as recent countermeasure techniques.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.21 no.6
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• pp.83-99
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• 2011

OTP (One Time Password) is widely used for protecting accounts on Internet banking, portal services and online game services in Korea. OTP is very strong method for enforcing account security but there are several ways for exploiting vulnerabilities caused by implementation errors. These attacks can work because of the weakness from OTP enabled system's vulnerabilities, not for OTP's algorithm itself. In this paper, we present the known attack scenarios such as MITM (Man-in-the-Middle) attack and various reverse engineering techniques; also, we show the test result of the attacks and countermeasures for these attacks.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.20 no.6
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• pp.59-65
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• 2010

Since an attacker can occur an error in cryptographic device during encryption process and extract secret key, the fault injection attack has become a serious threat in chip security. In this paper, we show that an attacker can retrieve the 128-bits secret key using fault injection attack on the for statement of final round key addition in AES implementation. To verify possibility of our proposal, we implement the AES system on ATmega128 microcontroller and try to inject a fault using laser beam. As a result, we can extract 128-bits secret key through just one success of fault injection.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.14 no.1
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• pp.344-365
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• 2020

Providing security has been always on priority in all areas of computing and communication, and for the systems that are low on computing power, implementing appropriate and efficient security mechanism has been a continuous challenge for the researchers. Radio Frequency Identification (RFID) system is such an environment, which requires the design and implementation of efficient security mechanism. Earlier, the security protocols for RFID based on hash functions and symmetric key cryptography have been proposed. But, due to high strength and requirement of less key size in elliptic curve cryptography, the focus of researchers has been on designing efficient security protocol for RFID based on elliptic curves. In this paper, an efficient elliptic curve signcryption based security protocol for RFID has been proposed, which provides mutual authentication, confidentiality, non-repudiation, integrity, availability, forward security, anonymity, and scalability. Moreover, the proposed protocol successfully provides resistance from replay attack, impersonation attack, location tracking attack, de-synchronization attack, denial of service attack, man-in-the-middle attack, cloning attack, and key-compromise attack. Results have revealed that the proposed protocol is efficient than the other related protocols as it takes less computational time and storage cost, especially for the tag, making it ideal to be used for RFID systems.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2003.12a
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• pp.573-577
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• 2003

본 논문에서는 하나의 네트워크로 연결되어진 가정내의 모든 가전 기기 및 PC 관련 제품들을 인터넷 접속을 통해 제어 및 데이터 전송을 가능하게 하는 흠 네트워크에서 DDoS Attack을 방지하고 보안 통신을 가능하게 하는 Secure Coordinator를 구현하였다 여러 가전기기들은 진화를 거듭하여 데이터 통신 및 원격 제어가 가능하게 되었고 대부분의 전자 장비들과 연결되어 하나의 Network를 구성하고 있다. 이러한 데이터 통신은 아직 암호화 통신이 이루어지지 않아 쉽게 외부로 유출 될 수 있을 뿐만 아니라 악의적인 사용자의 DDoS Attack 에 의해서 내부 Network는 쉽게 무력화 될 수 있다. 본 논문에서는 Secure Coordinator를 통한 DDoS Attack 방지 및 암호화 통신을 구현하였으며, 본 시스템을 통해 기존 시스템의 수정 없이 서버 및 클라이언트 앞단에 모듈처럼 삽입하는 방식으로 선계가 되어 있어 Home Networking 뿐만 아니라 서버/클라이언트어플리케이션에 많은 활용이 기대되어 진다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.30 no.6
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• pp.1207-1216
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• 2020

Since the server system in the cloud environments can simultaneously operate multiple OS and commonly share the memory space between users, an adversary can recover some secret information using cache side-channel attacks. In this paper, the Flush+Reload attack, a kind of cache side-channel attacks, is applied to the optimized precomputation table implementation of Korea block cipher standard ARIA. As an experimental result of attack on ARIA-128 implemented in Ubuntu environment, we show that the adversary can extract the 16 bytes last round key through Flush+Reload attack. Furthermore, the master key of ARIA can be revealed from last and first round key used in an encryption processing.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.16 no.9
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• pp.893-900
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• 1991

And this system is compared with past knapsack system by implementation of low density attack in Brickell and Lagarias, Odlyzko’s method. Also the VLSI architecture for parallel implementation of this linearly shift knapsack system is presented

• Journal of the Korea Society of Computer and Information
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• v.25 no.3
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• pp.65-72
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• 2020

With the development of information technology and the growth of the scale of system and network, cyber threats and crimes continue to increase. To cope with these threats, cybersecurity training based on actual attacks and defenses is required. However, cybersecurity training requires expert analysis and attack performance, which is inefficient in terms of cost and time. In this paper, we propose a cyber attack simulator that automatically executes attack techniques. This simulator generates attack scenarios by combining attack techniques modeled to be implemented and executes the attack by sequentially executing the derived scenarios. In order to verify the effectiveness of the proposed attack simulator, we experimented by setting an example attack goal and scenarios in a real environment. The attack simulator successfully performed five attack techniques to gain administrator privileges.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.32 no.3
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• pp.527-545
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• 2022

In order to effectively detect APT attacks performed by well-organized adversaries, we implemented a system to detect attacks by reconstructing attack chains of APT attacks. Our attack chain-based APT attack detection system consists of 'events collection and indexing' part which collects various events generated from hosts and network monitoring tools, 'unit attack detection' part which detects unit-level attacks defined in MITRE ATT&CK^® techniques, and 'attack chain reconstruction' part which reconstructs attack chains by performing causality analysis based on provenance graphs. To evaluate our system, we implemented a test-bed and conducted several simulated attack scenarios provided by MITRE ATT&CK Evaluation program. As a result of the experiment, we were able to confirm that our system effectively reconstructed the attack chains for the simulated attack scenarios. Using the system implemented in this study, rather than to understand attacks as fragmentary parts, it will be possible to understand and respond to attacks from the perspective of progress of attacks.