Secret key generating method, common key generating method,...

Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection

Reexamination Certificate

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C713S193000, C380S028000, C380S037000, C380S044000, C380S260000, C380S277000, C380S286000

Reexamination Certificate

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06996724

ABSTRACT:
At the time when generating a secret key of each entity by using each divided identification information (ID division vector) obtained by dividing identification information (ID vector) of each entity into a plurality of blocks and by using a secret symmetric matrix of each key generating agency (center), a part of the components of the symmetric matrix is extracted in accordance with each divided identification information (ID division vector) so that the extracted components are synthesized with a random number particular to each entity so as to generate a secret key of each entity.

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Adi Shamir, “Identity-Based Cryptosystems and Signature Schemes”, Weizmann Institute of Science, Springer-Verlag, pp. 47-53.
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“Common Key Sharing Scheme Based on Double Exponent Function”, by Masao Kasahara, Yasuyuki Murakami and Shigeo Tsujii Research Conference Report of the Institute of Electronics, Information and Communication Engineers (I Sec 99-2) Published by The Institute of Electronics, Information and Communication Engineers—May 20, 2000, vol. 99, No. 57, pp. 9-13.

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