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The malicious websites used by drive-by download attacks change their behavior for web client environments. To analyze the behavior of malicious websites, the singleenvironment analysis cannot obtain sufficient information. Hence, it is difficult to analyze the whole aspect of malicious websites. Also, the code obfuscation and cloaking are used in malicious websites to avoid to be analyzed their behavior...
Many researchers have analyzed the error correction capability of LDPC codes for iterative decoding algorithms. However, it is difficult to show the error correction capability of LDPC codes for iterative decoding algorithms based on belief propagation theoretically. Chilappagari et al. reported the error correction capability of column-weight-three regular LDPC codes under the Gallager A algorithm...
Symbol-pair read channels output overlapping pairs of symbols in storage applications. Pair distance and pair error are used in the channels. In this paper, we discuss the error-trapping decoding for cyclic codes over symbol-pair read channels. By putting some restrictions on the correctable pair error patterns, we discuss a new error-trapping decoding algorithm over the channels and show a circuitry...
This paper deals with symbol-pair error channels. First, we generalize the channels to symbol-tuple error channels whose read length is D. Then, we derive a message passing algorithm for decoding LDPC codes over the generalized channels. Furthermore, we investigate the Hamming distance distributions of LDPC codes in terms of D symbol-tuple metric.
Cassuto and Blaum proposed new error correcting codes which are called symbol-pair codes. They gave a coding framework for channels whose outputs are overlapping pairs of symbols in storage applications. It is called symbol-pair read channel. The pair distance and pair error are used in symbol-pair read channel. Cassuto et al. and showed Yaakobi et al. presented decoding algorithms for symbol-pair...
Non-binary low-density parity-check (LDPC) codes are linear block codes defined by the sparse parity-check matrix over finite fields. The weight distribution is a significant factor to evaluate error floors of LDPC codes. In this paper, we propose a probabilistic method for estimating the low part of the weight distribution of non-binary LDPC codes. Using the proposed method, we can estimate the low...
There are various studies and developments to notice the traffic information to drivers in the field of Intelligent Transport System (ITS) so that they can prevent traffic accidents. Vehicles must be timely transmitted information with integrity, since it influences an action of vehicles indirectly. Digital signature provides reliability for the information. In high vehicle density area, the vehicles...
In this paper, we propose an efficient method for computing the weight spectrum of LDPC convolutional codes constructed from quasi-cyclic block codes. In the proposed method, we reduce the memory size of their parity-check matrices with the same distance profile as original codes, and apply a forward and backward tree search algorithm to the parity-check matrices of reduced memory. We show numerical...
Intelligent Transport System (ITS) is for resolving traffic accidents and congestion by using information and communications technology. It is important to ensure the reliability of data in ITS. Public key encryption and digital signature are used for data security. Certification authority (CA) issues a certificate for a public key and manages a certificate revocation list (CRL). While a vehicle moves,...
In the analysis of maximum-likelihood decoding performance of low-density parity-check (LDPC) codes, the weight distribution is an important factor. Some methods based on the error impluse method have presented in order to estimate the weight distribution of LDPC codes. However, these methods have no scheme which determine the number of codeword in LDPC codes. In this paper, we propose a reliability-based...
The performance of LDPC codes decoded by iterative algorithm depends on the structural properties of their underlying Tanner graphs. For discrete memoryless channels, error patterns dominating the frame error rate (FER) in the error floor region are termed trapping set. We have shown approximate examinations of small trapping sets of LDPC codes using the probabilistic algorithm. In this paper, we...
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