• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.2 s.344
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• pp.22-26
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• 2006

Symmetric cryptographic algorithm is incongruent in network environment by absence of authencation in spite of advantage of easy etc. on data processing and implementation of high speed. Therefore, proposed merging style authentication algorithm that use MAC and MDC so that symmetric cryptographic algorithm can achieve authentication. Proposed algorithm made security can wide of secure communication channel as to achieve authentication to cryptographic algerian itself not that act independently of symmetric cryptographic algorithm.

• Journal of the Korea Society of Computer and Information
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• v.16 no.1
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• pp.143-151
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• 2011

Plaintext and key are independent in the existing block cipher. Also, encryption/decryption is performed by using structural features. Therefore, the external environment of suggested mixed cryptographic algorithm is identical with the existing ones, but internally, features of the existing block cipher were meant to be removed by making plaintext and key into dependent functions. Also, to decrease the loads on the authentication process, authentication add-on with dependent characteristic was included to increase the use of symmetric cryptographic algorithm. Through the simulation where the proposed cryptosystem was implemented in the chip level, we show that our system using the shorter key length than the length of the plaintext is two times faster than the existing systems.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.253-256
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• 2005

대칭형 암호 알고리즘의 단점을 보안하기 생겨난 비대칭 암호 알고리즘의 대표적인 알고리즘이 RSA 알고리즘이다. 본 논문에서는 RSA 알고리즘의 공개키와 비밀키를 사용자가 생성하고 Web을 통해 등록할 수 있는 키 관리 시스템을 구현하고, 이를 이용하여 사용자 인증, 암호화, 복호화 하는 과정을 보인다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.4
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• pp.778-784
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• 2012

A symmetric block cryptosystem uses an identical cryptographic key at encryption and decryption processes. HIGHT cipher algorithm is 64-bit block cryptographic technology for mobile device that was authorized as international standard by ISO/IEC on 2010. In this paper, block cipher HIGHT algorithm is designed using Verilog-HDL. Four modes of operation for block cipher such as ECB, CBC, OFB and CTR are supported. When continuous message blocks of fixed size are encrypted or decrypted, the desigend HIGHT core can process a 64-bit message block in every 34-clock cycle. The cryptographic processor designed in this paper operates at 144MHz on vertex chip of Xilinx, Inc. and the maximum throughput is 271Mbps. The designed cryptographic processor is applicable to security module of the areas such as PDA, smart card, internet banking and satellite broadcasting.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.5
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• pp.2322-2326
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• 2011

General cryptosystem uses differently the data and key value for the increment of security level, processes the repetition of limited number and increases the periodic feature of LFSR similar infinite series. So, it cause the efficiency of the cryptosystem. In this thesis, proposed algorithm is composed of reformat, permutation, data cipher block and key scheduler which is applied the new function by mixed symmetric cryptography and asymmetric cryptography. We design the cryptosystem of smart card using the common Synopsys and simulate by ALTERA MAX+PLUS II at 40MHz. Consequently, we confirm the 52% increment of processing rate and the security level of 16 rounds.

• Journal of Internet Computing and Services
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• v.21 no.3
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• pp.11-19
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• 2020

In this paper, a merged TEA block cipher processor which unifies Tiny Encryption Algorithm(TEA), extended Tiny Encryption Algorithm(XTEA) and corrected block TEA(XXTEA) is designed. After TEA cipher algorithm was first designed, XTEA and XXTEA cipher algorithms were designed to correct security weakness. Three types of cipher algorithm uses a 128-bit master key. The designed cipher processor can encrypt or decrypt 64-bit message block for TEA/XTEA and variable-length message blocks up to 256-bit for XXTEA. The maximum throughput for 64-bit message blocks is 137Mbps and that of 256-bit message blocks is 369Mbps. The merged TEA block cipher designed in this paper has a 16% gain on the area side compared to a lightweight LEA cipher. The cryptographic IP of this paper is applicable in security module of the mobile areas such as smart card, internet banking, and e-commerce.

• The KIPS Transactions:PartC
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• v.9C no.3
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• pp.343-350
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• 2002

This paper describes the implementation of H.235 protocol for authentication and media stream encryption of multimedia conference systems. H.235 protocol is recommended by ITU-T for H.323 multimedia conference security protocol to prevent from being eavesdropped and modified by an illegal attacker. The implementation in this paper has used password-based with symmetric encryption authentication. Media streams are encrypted using the Diffie-Hellman key exchange algorithm and symmetric encryption algorithms such as RC2, DES and Triple-DES. Also, 128-bit Advanced Encryption Standard and 128-bit Korean standard SEED algorithms are implemented for the future extension. The implemented authentication and media stream encryption has shown that it is possible to identify terminal users without exposing personal information on networks and to preserve security of multimedia conference. Also, encryption delay time and used memory are not increased even though supporting media stream encryption/decryption, thus the performance of multimedia conference system has not deteriorated.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10c
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• pp.291-293
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• 1999

본 논문은 네트워크 인증시스템 AUTHSYS에서 사용하는 SNAKE 프로토콜에 관한 논문이다. SNAKE 프로토콜은 키 분배 센터를 사용하는 중재 방식의 프로토콜이며, 티켓을 활용하는 프로토콜이다. SNAKE 프로토콜은 대칭형 암호 알고리즘과 해시 알고리즘만을 사용하는 프로토콜이며, none 기반 기법을 사용하여 메시지의 최근성을 보장한다. 또한 시스템간에 클릭 동기화를 요구하지 않으며, 클라이언트의 연산부담을 최소화하여 이동 컴퓨팅 환경에서 효과적으로 사용할 수 있도록 설계한 프로토콜이다.

• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.4
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• pp.805-810
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• 2012

Recently, applications range of NFC is widening by popularization of smartphone. Expansion of NFC means generalization of electronic payments systems. So security of NFC is very important. AES-128 is safe cryptographic technique for NFC now in use. But, the more range of applications increases, the more safe cryptographic techniques are necessary. In this paper, we propose the safe method is unaffected by the development of NFC. Proposed A-NFC scheme, adding the authentication of asymmetric cryptographic, is easy to apply for NFC and NFC-USIM chipsets, and it can adapt to the general NFC environment.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.6
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• pp.2713-2717
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• 2011

To transmit data from straggling sensors in water-processing basic industries etc., used Binary-CDMA system has safety voluntarily. But Binary-CDMA is necessity that react very sensitively in environment change as defense about hacking and cracking of various way that change suddenly. Therefore, this paper is that see added cryptographic algorithm for safety and easy update on correlator that a bottle-neck phenomenon is happened in Binary-CDMA to solve problem that is such. Added cryptographic algorithm does to communicate safe information in channel that is not safe as that achieve 1:1 confrontation for sensors by symmetric cryptographic algorithm.