• Proceedings of the IEEK Conference
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• 1998.06a
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• pp.58-61
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• 1998

In this paper, we analyzed SSL(Secure Socket Layer) protocol, symmentric algorithm is borken by choosen attack and known attack. This protocol prevents SSL form reusing a key and make new key without computational load of public-key algorithm.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10a
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• pp.90-91
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• 2007

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.605-607
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• 2012

In this paper, we propose another TCP Reset Attack. In the process of TCP's 3-way handshake, the receiver in the listen state receives segment including abnormal ACK number, then sends Reset to the sender (RFC 792). In this study, Attacker who monitors sender's packets sent in TCP initial connection sends segment including abnormal ACK number to the receiver before the sender sends normal ACK segment. The receiver received abnormal ACK number sends Reset to the sender. As a result, TCP connection is not established between the sender and the receiver.

• ETRI Journal
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• v.33 no.5
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• pp.822-825
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• 2011

Level-encoded dual-rail (LEDR) has been widely used in onchip asynchronous interconnects supporting a 2-phase handshake protocol. However, it inevitably requires 2N wires for N-bit data transfers. Encoder and decoder circuits that perform an asynchronous 2-phase handshake protocol with only N wires for N-bit data transfers are presented for on-chip global interconnects. Their fundamentals are based on a ternary encoding scheme using current-mode multiple valued logics. Using 0.25 ${\mu}m$ CMOS technologies, the maximum reduction ratio of the proposed circuits, compared with LEDR in terms of power-delay product, was measured as 39.5% at a wire length of 10 mm and data rate of 100 MHz.

• Proceedings of the KIEE Conference
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• 2004.11c
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• pp.234-236
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• 2004

Transmission control protocol(TCP) is protocol used in internet. TCP is seldom transmission error and is protocol based on wire environment. TCP uses 3 way handshake ways, data transmission control through windows size, data transmission control through reception confirmation, sliding window for packet delivery. In this study, designed TCP packet ion module for analyze the TCP segments & correct information about TCP. TCP capture in internet using designed TCP module and analysed TCP segments composition. Through this, could analyze the correct information of protocol in network.

• Journal of Internet Computing and Services
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• v.12 no.2
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• pp.75-83
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• 2011

Wireless services and devices that use frequency increase more and more because of advancement of the industry. Therefore, the available spectrum band becomes increasingly insufficient. Cognitive Radio, which adaptively utilizes the vacant licensed spectrum band, is considered as an effective way to utilize the spectrum resource shortage. CR user should move from current allocated channel to vacant channel to avoid the interference to the primary user when the primary user appears in the current channel. In this case, CR system undergoes the break off time until handshake is completed. So, in order to guarantee the Quality of Service(QoS) of CR system, fast handshake method is required. In this paper, we propose the embedded control signal transmission technique to reduce the break off time. This method can transmit the control signals in data transmission period as well as the broadcasting period. Proposed method can improve the data throughput and decrease the break off time. Computer based simulation proves that our proposed scheme outperforms conventional one.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.32 no.7
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• pp.254-260
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• 1983

In this paper a basic design procedure for programmable instruments of IEEE-488 BUS system has been discussed by designing a specific programmable frequency counter with its hardware and software. The designed programmable frequency counter has a programmable range switch and a function of the programable number of measurements. It contains five basic functions(Talker. Listener, Source handshake, Accepter handshake and Controller) of a IEEE-488 BUS and the Device-Trigger as a supplimentary function. The hardware has been built along with 6800 MPU and 68488 GPIA, and its software has included initialization, interrupt handler, BI.GET,BO and controller routines, The designed system given in this paper has been successfuly tested via some experiments.

• Proceedings of the Korean Society of Computer Information Conference
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• 2009.01a
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• pp.381-384
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• 2009

통신기술의 발달에 따라, 사용자들은 다양한 통신 서비스와 편의를 제공받게 되었지만, 서비스 거부 공격 및 재전송 공격 등의 다양한 위협 역시 존재 하게 되었다. 이에 따라, IETF는 안전한 통신을 위해 Transport Layer Security (TLS)를 제안하였다. 그러나 TLS는 3자간 통신을 보호하려 할 때, Handshake 과정을 여러 번 반복해야하는 비효율성을 지니고 있었다. 따라서 우라는 본 논문을 통해 3자간 통신이 가능한 TLS 프로토콜을 제안한다. 기존 TLS와의 호환성 유지를 위해 최소한의 변형만 이루어졌으며, 객체 간 통신 시간 측정을 통해 Handshake 과정을 효율적으로 수행할 수 있도록 구성하였다.

• The Journal of the Korea Contents Association
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• v.6 no.8
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• pp.30-37
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• 2006

At the present, Short Messaging Transfer Protocol Standard described under TIA/EIA/IS-637-A does not cover the measures for security at all. Sequentially, in case of necessity, it seems to be a better idea that security functions are made up for current short messaging transfer protocol. This paper proposes security mechanisms including algorithms and protocols for Short Messaging Services(SMS) which present not only high levels of confidentiality and integrity but also appropriate level of authentication.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.34S no.9
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• pp.1-12
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• 1997

The performance of Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) protocol adopted as a draft standard of IEEE 802.11 wireless LAN, is analyzed by using mathematical method based on renewal theory. We introdude three kinds of CSMA/CA protocols basic, stop-and-wait and 4-Way handshake CSMA/CA with their mathematical analysis. First, a network of finite population is considered and then expand to infinite population. We model the CSMA/CA protocol as a hybrid protocol of 1-persistent CSMA and p-persistent CSMA protocol, and verify analaytical results by computer simulation. We have found that 4-Way Handshake CAMA/CA shows better performance than those of other two types of CSMA/CA in case of high traffic load.