• Journal of the Korea Computer Industry Society
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• v.3 no.9
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• pp.1329-1338
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• 2002

In this paper, we propose an extended version of A5 stream cipher, which have been used in GSM mobile system. And we analyze the proposed algorithm in parameters with period, linear complexity and randomness, and compare to the original parameters.

• Journal of Korea Society of Industrial Information Systems
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• v.17 no.7
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• pp.71-79
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• 2012

Propose stream cipher Canon that need in Wireless sensor network construction that can secure confidentiality and integrity. Create Canon 128 bits streams key by 128 bits secret key and 128 bits IV, and makes 128 bits cipher text through whitening processing with produced streams key and 128 bits plaintext together. Canon for easy hardware implementation and software running fast algorithm consists only of simple logic operations. In particular, because it does not use S-boxes for non-linear operations, hardware implementation is very easy. Proposed stream cipher Canon shows fast speed test results performed better than AES, Salsa20, and gate number is small than Trivium. Canon purpose of the physical environment is very limited applications, mobile phones, wireless Internet environment, DRM (Digital Right Management), wireless sensor networks, RFID, and use software and hardware implementation easy 128 bits stream ciphers.

• The KIPS Transactions:PartC
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• v.9C no.3
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• pp.307-312
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• 2002

Among the various zero suppression (ZS) algorithms used in a for synchronous stream cipher system, a ZS-2 exhibits certain good properties, including the omission of the block synchronization, easy implementation, etc., yet also a weakness in channel error propagation. Accordingly, This paper proposes a new method by minimizing the bit-wide substitution in the substitution blocks of ZS-2 to improve the degenerated error property in a noisy channel. As a result, the proposed ZS-3 algorithm can decrease the mean error propagation by about 18.7% over that of ZS-2 at n=8.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.10a
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• pp.326-329
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• 2017

Most modern computer communications and storage media support encryption technology. Many of the Ping Pong algorithms are stream ciphers that generate random numbers in the LFSR core structure. The LFSR has a structure that guarantees the maximum period of a given size, but it has a linear structure and can be predicted. Therefore, the Ping Pong algorithm has a feature of making the linearity of the LFSR into a nonlinear structure through variable clocks and functions. In this paper, we try to improve the existing linearity by replacing the linear disadvantages of LFSR with logistic maps.

• The KIPS Transactions:PartC
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• v.12C no.4 s.100
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• pp.495-502
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• 2005

Cryptographic algorithm testing is performed to ensure that a specific algorithm implementation is implemented correctly and functions correctly. CMVP(Cryptographic Module Validation Program) of NIST in US is the well-known testing system that validates cryptographic modules to Federal Information Processing Standards (FIPS). There is no FIPS-approved stream cipher, and CMVP doesn't involve its validation testing procedure. In this paper we provide validation systems for three currently used light-weight stream ciphers: Bluetooth encryption algorithm E0, 3GPP encryption algorithm A5/3, and RC4 used for WEP and SSL/TLS Protocols. Moreover we describe our validation tools implemented by JAVA programing.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.13 no.1
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• pp.139-146
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• 2003

In this paper we demonstrate a cryptanalysis of the stream cipher LILI-128. Our approach to analysis on LILI-128 is to solve an overdefined system of multivariate equations. The LILI-128 keystream generato $r^{[8]}$ is a LFSR-based synchronous stream cipher with 128 bit key. This cipher consists of two parts, “CLOCK CONTROL”, pan and “DATA GENERATION”, part. We focus on the “DATA GENERATION”part. This part uses the function $f_d$. that satisfies the third order of correlation immunity, high nonlinearity and balancedness. But, this function does not have highly nonlinear order(i.e. high degree in its algebraic normal form). We use this property of the function $f_d$. We reduced the problem of recovering the secret key of LILI-128 to the problem of solving a largely overdefined system of multivariate equations of degree K=6. In our best version of the XL-based cryptanalysis we have the parameter D=7. Our fastest cryptanalysis of LILI-128 requires $2^{110.7}$ CPU clocks. This complexity can be achieved using only $2^{26.3}$ keystream bits.

• Journal of Korea Society of Industrial Information Systems
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• v.6 no.1
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• pp.7-14
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• 2001

Among zero-suppression (ZS) algorithms proposed for synchronous stream cipher system, ZS-1 has the difficulty on the implementation of stream cipher system, ZS-2 has a weakness of channel error propagation, and ZS-3 has the complexity on the hardware. Because each algorithm must be chosen carefully to the application system, in this paper, we propose a criterion of the system adapted from the simulated results on the parameter changed.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.10 no.3
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• pp.29-36
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• 2000

It is very import role to increase communication quality that fast detection of random sequence synchronization fail in synchronous stream cipher system using initial synchronization mode. Generally it sends additional information to detect random sequency synchronization fail. But we can't transmit additional informations to decide synchronization fail in a system using RMVD to correct channel error. In this paper we propose a method to detect synchronization fail in the receiver even though a system using RMVD has no margin to send additional information, For detecting random sequency synchronization fail we decipher receiver data analyze probability of transition rate for pre-determined period and decide synchronization fail using calculated transition rate probability. This proposed method is fast very reliable and robust in noisy channel and is easily implemented with hardware.

• Proceedings of the IEEK Conference
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• 2003.07d
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• pp.1503-1506
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• 2003

In this paper, we propose a mutual Authentication module, using ECDSA(Elliptic Curve Digital Signature Algorithm) for web-Camera system. which. is based on three module. first is authentication module which is based on ECDSA algorithm. second is transfort module using stream socket. the last module is graphic module. This paper describes cipher algorithm which can be used restrict condition for the same secret service with wire internet. we made a authentication module using based client and server system.

• Journal of information and communication convergence engineering
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• v.8 no.1
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• pp.64-70
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• 2010

In this paper, we study and develope a special secure Dongle to be adapted in GSM SmartPhone for secure voice communication to the serial 20-pin connector in SmartPhone. We design and implement the Dongle module hardware, firmware, and software including cipher crypto-synchronization and cipher algorithm. Also we study and emulate the SmartPhone GUI software interface including communication software module to the Dongle. Finally, we analyze the performances of crypto-synchronization in some noisy environment and also we test the secure Dongle module.