Tsutomu Matsumoto

Yokohama National University

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Katsunari Yoshioka

Yokohama National University

Hideki Imai

Ishikawa Prefectural Nursing University

Junichi Sakamoto

Yokohama National University

Rui Tanabe

Yokohama National University

Daisuke Fujimoto

Nara Institute of Science and Technology

Naoki Yoshida

Yokohama National University

Junji Shikata

Yokohama National University

Shigeyasu Kawaji

Kumamoto University

Daisuke Inoue

National Institute of Information and Communications Technology

Takayuki Sasaki

Yokohama National University

Cooperative Institutions

Yokohama National University

110

The University of Tokyo

102

Tokyo Medical and Dental University

Osaka University

Tohoku University

National Institute of Advanced Industrial Science and Technology

Keio University

Kyoto University

University of Tsukuba

National Institute of Information and Communications Technology

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Information Hiding on Lossless Data Compression

Information Hiding (2006)

Katsunari Yoshioka Kotaro Sonoda Osamu Takizawa Tsutomu Matsumoto

We address a new class of Information hiding on lossless data compression. In our model, secret information is embedded into a compressed data (e.g. ZIP) in a way that the compressed data can still be decompressed by regular decompression process (e.g. UNZIP). The entity with secret key can extract the secret information from the compressed data. In this paper, we formally define the above model of information hiding on lossless data compression. Then, we focus on a particular compression method, namely LZSS, which is adopted in ZIP/LHA. We propose a new method, called IH-LZSS, that controls the trade-off between themaximum embeddable data size and compression rate. Some experimental results are also shown.

Lossy compression

Data compression ratio

10.1109/iih-msp.2006.124

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Citations (1)

SAC를 만족하는 S-Box의 효율적 발생 방법 ( An efficient generation method of S-boxes satisfying strict avalanche criterion )

대한전자공학회 학술대회 (1990)

김광조 Tsutomu Matsumoto Hideki Imai

Source

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FOREWORD

IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences (2012)

Tsutomu Matsumoto

10.1587/transfun.e96.a.1

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It Never Rains but It Pours: Analyzing and Detecting Fake Removal Information Advertisement Sites

Lecture notes in computer science (2020)

Takashi Koide Daiki Chiba Mitsuaki Akiyama Katsunari Yoshioka Tsutomu Matsumoto

Web site

Cyber threats

10.1007/978-3-030-52683-2_9

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Practice of creativity Education by the subject of micromouse competition

IFAC Proceedings Volumes (2010)

K. Hayama Tsutomu Matsumoto

10.3182/20091021-3-jp-2009.00061

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Exploring Event-synced Navigation Attacks across User-generated Content Platforms in the Wild

Journal of Information Processing (2022)

Hiroki Nakano Daiki Chiba Takashi Koide Mitsuaki Akiyama Katsunari Yoshioka

The growth of user-generated content service platforms has led to people relying on user-generated content (UGC) rather than search engines when searching for and accessing information on the web. Attackers can also use UGC on a UGC service platform to disseminate web-based social engineering (SE) attacks to a large number of people. In this paper, we focus on an event-synced navigation attack, a type of web-based SE attack that generates UGC with links to malicious websites and distributes it synced with a real-life event at a specific time. To understand the attacks in the wild, we propose a three-step system to detect event-synced navigation attacks in real time by capturing the inevitable footprints left by attackers. We evaluate each step of the proposed system and determine that the proposed system can classify malicious and non-malicious UGC with 97% accuracy. In addition, we performed a comprehensive measurement study on event-synced navigation attacks spread from popular UGC platforms. We found that 34.1% of the fully qualified domain names of malicious websites associated with the event-synced navigation attack were spread from two or more UGC platforms. Finally, we also found that 87.8% of FQDN associated with well-known type of malicious websites (i.e., information theft, survey scams, suspicious browser plugin installations, etc.) survive for more than 100 days and that countermeasures taken by the UGC platform only covered 31.0% of the malicious UGC we detected in this study even though the malicious websites were accessed frequently.

User-Generated Content

10.2197/ipsjjip.30.372

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DETECTING AND REVOKING COMPROMISED KEYS

Lecture notes series, Institute For Mathematical Sciences (2002)

Tsutomu Matsumoto

10.1142/9789812388841_0006

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Can We Stabilize the Price of a Cryptocurrency?: Understanding the Design of Bitcoin and Its Potential to Compete with Central Bank Money

SSRN Electronic Journal (2014)

Mitsuru Iwamura Yukinobu Kitamura Tsutomu Matsumoto Kenji Saito

This paper discusses the potential and limitations of Bitcoin as a digital currency.Bitcoin as a digital asset has been extensively discussed from the viewpoints of engineering and security design.But there are few economic analyses of Bitcoin as a currency.Bitcoin was designed as a payments vehicle and as a store of value (or speculation).It has no use bar as money or currency.Despite recent enthusiasm for Bitcoin, it seems very unlikely that currencies provided by central banks are at risk of being replaced, primarily because of the market price instability of Bitcoin (i.e. the exchange rate against the major currencies).We diagnose the instability of market price of Bitcoin as being a symptom of the lack of flexibility in the Bitcoin supply schedule -a predetermined algorithm in which the proof of work is the major driving force.This paper explores the problem of instability from the viewpoint of economics and suggests a new monetary policy rule (i.e.monetary policy without a central bank) for stabilizing the values of Bitcoin and other cryptocurrencies.

Fiat money

10.2139/ssrn.2519367

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Citations (47)

Dual-Layer Recordable Digital Versatile Disc Having Protruded Land Pre Pit in L1 Layer Fabricated by Inverse Stack Method

Japanese Journal of Applied Physics (2007)

Koji Tsujita Kenichi Shimomai Katsunori Ohshima Masanori Takahashi Akihiko Nomura

The dual-layer recordable digital versatile disc (DVD-R DL) fabricated by an inverse stack method has not been released in the market because of unstable land pre pit (LPP) addressing in an L1 layer due to its peculiar disc structure. We have developed a DVD-R DL disc that has the novel shape of the protruded LPP in the L1 layer fabricated by an inverse stack method. The height of the protruded LPP is larger than the land height of the L1 substrate to restrain extensions in the radial direction of recording marks. We have confirmed that the protruded LPP disc satisfies the specifications of DVD-R DL and enables stable LPP addressing.

Dual layer

10.1143/jjap.46.3973

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Isolation and characterization of a novel potyvirus tentatively named Ornithogalum virus 2

Journal of General Plant Pathology (2007)

Tsutomu Matsumoto Hideki Yamamoto Shin‐ichi Fuji Masayasu Inoue

Turnip mosaic virus

Mosaic virus

Isolation

10.1007/s10327-007-0010-3

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Citations (4)