Faculty Profiles - YAMAUCHI Toshihiro

Proposal and Evaluation for Improvement of Corpus Separation in Bayesian Spam Filtering on Multi-lingual Environment

Other Link： https://dblp.uni-trier.de/db/conf/kes/kes2006-2.html#TataraTS06

IWANAGA MANABU, TABATA TOSHIHIRO, SAKURAI KOUICHI

IPSJ journal 46 ( 8 ) 1959 - 1966 2005.8

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

Statistical filtering using Bayes theory, called Bayesian filtering, is studied for years, and after Graham published an essay "A plan for spam", many implementations of Bayesian filtering have developed. In multi-lingual email environment, which more than one language is used in incoming email, corpus for statistical filtering is usually separated into ones specified to each language. In this paper, we propose a new method in which a corpus is chosen for each token, and then we show the efficiency of our proposed method by experiments in comparison to traditional methods.

A Software Fingerprinting Scheme for Java Using Class Structure Transformation

Other Link： http://id.nii.ac.jp/1001/00010556/

FUKUSHIMA KAZUHIDE, TABATA TOSHIHIRO, TANAKA TOSHIAKI, SAKURAI KOUICHI

IPSJ journal 46 ( 8 ) 2042 - 2052 2005.8

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

Embedding personal identifiers as watermarks to software is effective in order to protect copyright of them. Monden et al. proposed program watermarking scheme for embedding arbiter character sequence to target Java class files. But their scheme can be used to embed only the same watermarking to all the programs. Thus, if we apply their scheme to embed users' personal identifiers, the watermark can be specified by comparing two or more users' program. This paper improve the problem by using a class structure transformation.

The Design and Evaluation of Anomaly Detection System Based on System Call

Other Link： http://id.nii.ac.jp/1001/00010564/

TATARA KOHEI, TABATA TOSHIHIRO, SAKURAI KOUICHI

IPSJ journal 46 ( 8 ) 1967 - 1975 2005.8

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

In order to prevent attacks exploiting buffer overflow vulnerabilities, there are many researches of checking programs for abnormal behaviors based on history of system calls emitted by them. In this paper, the authors take into account control flow of the programs, and prove an efficiency of a method for modeling history of system calls in a Bayesian Network. We also consider a method for appropriate anomaly detection without false positives.

On the Security of Integration of SELinux Access Permissions

Other Link： http://id.nii.ac.jp/1001/00010557/

TABATA TOSHIHIRO, SUEYASU KATSUYA, SAKURAI KOUICHI

IPSJ journal 46 ( 4 ) 1070 - 1073 2005.4

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

SELinux Policy Editor is a configuration tool for SELinux. As a part of its support of configuration, this tool simplifies the configuration of SELinux by integrating configuration items. However, the integration of configuration items may harm the fine-grained access control of SELinux. In this paper, we examine the effects of the simplification on access control policy and report the evaluation of the security about Apache web server.

A probabilistic method for detecting anomalous program behavior

Other Link： http://id.nii.ac.jp/1001/00010661/

Kohei Tatara, Toshihiro Tabata, Kouichi Sakurai

Lecture Notes in Computer Science 3325 87 - 98 2005

Publishing type：Research paper (international conference proceedings) Publisher：Springer

In this paper, we, as well as Eskin, Lee, Stolfo propose a method of prediction model. In their method, the program was characterized with both the order and the kind of system calls. We focus on a non-sequential feature of system calls given from a program. We apply a Bayesian network to predicting the N-th system call from the sequence of system calls of the length N - 1. In addition, we show that a correlation between several kinds of system calls can be expressed by using our method, and can characterize a program behavior. © Springer-Verlag Berlin Heidelberg 2004.

DOI： 10.1007/978-3-540-31815-6_8

Program obfuscation scheme using random numbers to complicate control flow

Other Link： https://dblp.uni-trier.de/db/conf/wisa/wisa2004.html#TataraTS04

An Abuse Prevention Technique of CPU Time by Using Execution Resource

Toshihiro TABATA, Satoshi Hakomori, Hideo Taniguchi

PreProc. of the 6th International Workshop on Information Security Applications (WISA2005) 2005

Tatsuya Toyofuku, Toshihiro Tabata, Kouichi Sakurai

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 3823 LNCS 916 - 925 2005

Language：English Publishing type：Research paper (international conference proceedings) Publisher：SPRINGER-VERLAG BERLIN

For the security technology that has been achieved with software in the computer system and the protection of the intellectual property right of software, software protection technology is necessary. One of those techniques is called obfuscation, which converts program to make analysis difficult while preserving its function. In this paper, we examine the applicability of our program obfuscation scheme to complicate control flow and study the tolerance against program analysis. © IFIP International Federation for Information Processing 2005.

DOI： 10.1007/11596042_94

Some fitting of naive Bayesian spam filtering for Japanese environment

Other Link： https://dblp.uni-trier.de/db/conf/euc/eucw2005.html#ToyofukuTS05

Manabu Iwanaga, Toshihiro Tabata, Kouichi Sakurai

Lecture Notes in Computer Science 3325 135 - 143 2005

Language：English Publishing type：Research paper (international conference proceedings) Publisher：SPRINGER-VERLAG BERLIN

Bayesian filtering is one of the most famous anti-spam measures. However, there is no standard implementation for treatment of Japanese emails by Bayesian filtering. In this paper, we compare several conceivable ways to treat Japanese emails about tokenizing and corpus separation. In addition, we give experimental results and some knowledge obtained by the experiments. © Springer-Verlag Berlin Heidelberg 2004.

DOI： 10.1007/978-3-540-31815-6_12

A Mechanism of Regulating Execution Performance for Process Group by Execution Resource on Tender Operating System

Other Link： https://dblp.uni-trier.de/db/conf/wisa/wisa2004.html#IwanagaTS04

Usage Control Model and Architecture for Data Confidentiality in Database Service Provider

Amril Syalim, Toshihiro Tabata, Kouichi Sakurai

Proc. of Indonesia Cryptology and Information Security Conference (INA-CISC) 2005 2005

The Design and Evaluation of Anomaly Detection System Based on System Call

たたら講平, 田端利宏, 桜井幸一

情報処理学会論文誌 46 ( 8 ) 2005

Proposal and Evaluation for Improvement of Corpus Separation in Bayesian Spam Filtering on Multi-lingual Environment

岩永学, 田端利宏, 桜井幸一

情報処理学会論文誌 46 ( 8 ) 2005

On the Security of Integration of SELinux Access Permissions

田端利宏, 末安克也, 桜井幸一

情報処理学会論文誌 46 ( 4 ) 2005

A Software Fingerprinting Scheme for Java Using Class Structure Transformation

福島和英, 田端利宏, 田中俊昭, 桜井幸一

情報処理学会論文誌 46 ( 8 ) 2005

TABATA Toshihiro, NOMURA Yoshinari, TANIGUCHI Hideo

The IEICE transactions on information systems Pt. 1 87 ( 11 ) 961 - 974 2004.11

Proposal of Anti-spam Scheme Combining Challenge-response and Bayesian Filtering

IWANAGA MANABU, TABATA TOSHIHIRO, SAKURAI KOUICHI

IPSJ journal 45 ( 8 ) 1939 - 1947 2004.8

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

Some anti-spam schemes are based on challenge-response, a principle that a recipient reads only messages from senders who are registered by the recipient. In these schemes, request for setup is sent to senders who are not registered. Since bounce messages are legitimate but MTA cannot reply to request, we should have some exception to receive for them. However, spammers can abuse this exception to send spam to users, disguising their spam with bounce messages. In this paper, we propose an improved scheme, combining challenge-response and Bayesian filtering, then perform some tests on the effect of our scheme to avoid those spam.

Evaluation of detection of bounce-disguised spam by combining challenge-response and Bayeaian filtering

Other Link： http://id.nii.ac.jp/1001/00010841/

Iwanaga Manabu, Tabata Toshihiro, Sakurai Kouichi

Annual report of Computing and Communications Center, Kyushu University 4 ( 4 ) 41 - 47 2004.3

Design of Intrusion Detection System at User Level with System-Call Interposing.

Toshihiro Tabata, Kouichi Sakurai

ICETE 2004, 1st International Conference on E-Business and Telecommunication Networks 263 - 268 2004

A resource management method for improving recycling ratio in recycling process elements

T Tabata, H Taniguchi

8TH WORLD MULTI-CONFERENCE ON SYSTEMICS, CYBERNETICS AND INFORMATICS, VOL V, PROCEEDINGS 203 - 208 2004

Language：English Publishing type：Research paper (international conference proceedings) Publisher：INT INST INFORMATICS & SYSTEMICS

A process is a program in execution. Processes can be executed concurrently in operating Systems (OS) and they may be created and be deleted dynamically. Process creation and termination are required for program execution. They axe an important processing, but the cost of them is expensive. The cost of them affects the execution performance of programs. We proposed a fast process creation and termination mechanism by recycling process elements. The management of preserved process elements is an important problem for recycling. We also proposed an efficient resource management for recycling process elements. The proposed method can reduce the amount of memory consumption of preserved resources. It focused on frequency of program execution, but it is insufficient to reduce the cost.
In this paper, we propose an improved resource management method for recycling process elements. In the method, only one process element with program image is preserved for each program with high frequency in program execution. The method can reduce the amount of memory consumption of preserved process elements. We also describe the implementation of proposal method on Tender operating system and report the contents of experiments and the result of them.