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994 results on '"Okamoto, E."'

166. Ultrasonographic evaluation of swallowing

Author

Aoki, S., primary, Hata, J., additional, Haruma, K., additional, Yoshida, S., additional, Yamashita, N., additional, Hananoki, M., additional, Kusunoki, H., additional, Okamoto, E., additional, Tanaka, S., additional, Yoshihara, M., additional, Sumii, K., additional, and Kajiyama, G., additional

Published
1998
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199. Lifetimes of Keys in Cryptographic Key Management Systems.

Author

Goos, G., Hartmanis, J., Barstow, D., Brauer, W., Brinch Hansen, P., Gries, D., Luckham, D., Moler, C., Pnueli, A., Seegmüller, G., Stoer, J., Wirth, N., Williams, Hugh C., Okamoto, E., and Nakamura, K.

Abstract

The keys lifetimes necessary to attain a certain low disclosure rate have been investigated for two types of schemes. DES is employed as an encryption algorithm example. This paper employs the poorest attack, namely the exhaustive attack as a cryptanalysis. There may be a more effective attack. As results, we recommend to adopt SCHEME 2 and to change the master key ‘at least' within a few years. [ABSTRACT FROM AUTHOR]

Published
1986
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200. Secure Information Gathering Agent for Internet Trading.

Author

Chenqi Zhang, Lukose, Dickson, Wang, X. F., Yi, X., Lam, K. Y., and Okamoto, E.

Abstract

With the proliferation of commercial information on the Internet, intelligent agent becomes an effective implement to collect information for conducting trading. However, great security threats also exist under this scenario. Since agent will be executed by the host, it seems inevitable to expose its codes and data to host's attacks. In this paper, we propose a security system to protect information gathering agent from malicious hosts. The encryption technique and detection object will be taken to sense any illegal manipulation to the agent body. Distributed login data base (LDB) is introduced to assure any destructor will be easily dug out. Therefore, Internet trading under the framework of this system enable agent to conduct commercial information gathering among hosts freely and securely. Keywords: Electronics commerce, information gathering agent, detect object, public-key cryptosystem and hash function, non-repudiation. [ABSTRACT FROM AUTHOR]

Published
1998
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