• The KIPS Transactions:PartC
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• v.12C no.6 s.102
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• pp.827-838
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• 2005

DDoS (Distributed Denial of Service) attack is a critical threat to current Internet. To solve the detection and response of DDoS attack on BcN, we have investigated detection algorithms of DDoS and Implemented anomaly detection modules. Recently too many technologies of the detection and prevention have developed, but it is difficult that the IDS distinguishes normal traffic from the DDoS attack Therefore, when the DDoS attack is detected by the IDS, the firewall just discards all over-bounded traffic for a victim or absolutely decreases the threshold of the router. That is just only a method for preventing the DDoS attack. This paper proposed the mechanism of response for the legitimated clients to be protected Then, we have designed and implemented the statistic based system that has the automated detection and response functionality against DDoS on Linux Zebra router environment.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.25 no.3
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• pp.703-713
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• 2015

The linking system between the control system and the field devices in the existing EMS/SCADA, in order to increase the reliability of the data, and access control through the separation of external network. Currently, There is a tendency that the need for connection to an external network that takes into account the economic aspect, systematic management and efficiency of operations is increasing. Such is evolved linkage section, is to have more security vulnerabilities than in the past, Eventually communication EMS/SCADA linkage section requires special management method. In this paper, taking into account the domestic environment, were presented the security Certification and Accreditation technology that was applied to serial DNP3 and TCP/IP based DNP3 that are mainly used in EMS/SCADA linkage section. Presented to security of Certification and Accreditation technology, divided into Resource Robustness Test and Malicious Packet Test for evaluate the safety. Each of the security requirements and evaluation method in proposed technology, is an attempt to present the differentiation of the existing Certification and Accreditation technology.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.26 no.6
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• pp.1375-1386
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• 2016

This paper presents an efficient hash chain-based data authentication mechanism which can considerably reduce the overhead of processing and transmission for authenticating segments in CCN. The proposed method makes use of hash chain and MHT(Merkle Hash Tree). At first, it applies hash chain methods for data segments and encodes them to Data part. Then, it constitutes Meta part with the hash values generated at the previous step and properly applies both hash chain method and MHT-based signing for not only achieving efficiency, but also mitigating the drawback(data-loss, out-of-order transmission) of hash chain method. We have implemented our method in the CCNx library and measured the performance. When transmitting 100Mbyte of content, the proposed method generates only 2.596% of processing overhead and 1.803% of transmission overhead.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.28 no.4
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• pp.975-985
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• 2018

ICN architecture, one of future Internet technologies, proposes that content request packets toward a content source can be responded by several distributed nodes. So, ICN can solve network congestion which is happened around content sources and provide a seamless content distribution service regardless of the network and system statuses of content sources. Especially, CCN implements content caching functionality in network nodes so that such intermediated network nodes can themselves respond to content requests. However, when receiving content from distributed nodes, users receiving content cannot authenticate the nodes providing the content. So CCN is vulnerable to various attacks such as an impersonation attack, a data pollution attack, and so on. This paper first describes CCN content authentication and its weakness. Then it proposes an improved content authentication scheme based on a blockchain and evaluates the performance of the proposed scheme.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.9 no.1
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• pp.57-70
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• 1999

Since a hybrid firewall filters packets at a network layer along with providing gateway functionalities at an application layer, it has a better performance than an If filtering firewall. In addition, it provides both the various kinds of access control mechanisms and transparent services to users. However, the security policies of a network layer are different from those of an application layer. Thus, the user interfaces for managing a hybrid firewalls in a consistent manner are needed. In this paper, we implement a graphical user interface to provide access control mechanisms and management facilities for a hybrid firewall such as log analysis, a real-time monitor for network traffics, and the statisics on traffics. And we also propose a new rule script language for specifying access control rules. By using the script language, users can generate the various forma of access control rules which are adapted by the existing firewalls.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.14 no.5
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• pp.49-56
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• 2004

An Internet draft, named RR(Return Routability) protocol, proposed to IETF mobileip WG, in order to establish an optimal path to MN(Mobile Node) by securely sending the BU(Binding Update) message to CN(Correspondent Node). However, it has some problems with initiating the protocol by the MN: it causes to increases in communication load in the home network, to increases communication delay between MN and CN, and increases in communication load due to unnecessary message exchanges. To resolve the problems, this paper proposes an alternative scheme for the RR protocol in MIPv6. The proposed scheme is devised to start the protocol by HA on receiving the first packet from CN. It decreases the route optimization overhead by reducing the number of BU messages as well as the communication time. Beside these advantages, this scheme provides the same security grade as the original RR protocol.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.17 no.6
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• pp.143-148
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• 2007

In the context of mass traffic, firewall system cannot record normal log files against DDoS attack. The loss of log record causes that a firewall system does not know whether a packet is normally filtered or not, and firewall log, which is an essential data for the counter measure of violation accident, cannot be verified as trusted. As a network speed increases, these problems happen more frequently and largely. Accordingly, the method to use simply additional hardware devices is not recommended for the popularization of firewall. This paper is devoted to verify the loss of iptable log that is the mother's womb of most domestic firewall systems and show that the log handling methods for conventional firewall systems are needed to improve.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.15 no.5
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• pp.3-11
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• 2005

This paper presents a performance analysis model based on an M/M/1 queue and Poisson distribution of input data traffic. The simulation on a pipelined AES system with processing rate of 10 rounds per clock shows $4.0\%$ higher performance than a non-pipelined version consuming 10 clocks per transaction. Physical implementation of pipelined AES with FPGA takes 3.5 times bigger gate counts than the non-pipelined version whereas the pipelined version yields only $3.5\%$ performance enhancement. The proposed analysis model can be used to optimize cost-performance of AES hardware designs.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.16 no.6
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• pp.135-149
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• 2006

Securing wireless Ad hoc network including the secure mechanism design and implementation is generally more difficult for vulnerability of channels and nodes, the absence of infrastructure, topology that change dynamically, and etc, than ire network. The efforts of early researches are based on the adaptation of securing methods for the wire network to wireless ad hoc network. However, wireless ad hoc network could not get effective study finding because network has essential problems. This paper proposes that some new problems are being came to light over the survivability and availability of the network itself, that are caused by the massive packet attack of more than one or two nodes, and proves the consequence of this phenomenon. Also, we propose an effective prevention mechanism of masquerade attacks for survivability reinforcement that escape standard of the early way by survivability of wireless Ad hoc network and approaches for performance elevation and reflect special quality of wireless Ad hoc network.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.16 no.6
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• pp.111-121
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• 2006

As Internet lastly grows, network attack techniques are transformed and new attack types are appearing. The existing network-based intrusion detection systems detect well known attack, but the false-positive or false-negative against unknown attack is appearing high. In addition, The existing network-based intrusion detection systems is difficult to real time detection against a large network pack data in the network and to response and recognition against new attack type. Therefore, it requires method to heighten the detection rate about a various large dataset and to reduce the false-positive. In this paper, we propose method to reduce the false-positive using multi-level detection algorithm, that is combine the multidimensional Apriori algorithm and the modified Negative Selection algorithm. And we apply this algorithm in intrusion detection and, to be sure, it has a good performance.