Key exchange method and key exchange system

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United States of America Patent

PATENT NO 11677543
APP PUB NO 20210314146A1
SERIAL NO

17350201

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Plurality of users share a common key while permitting change of members sharing the common key and computational complexity required for key exchange is reduced. Ri and ci are computed based on a twisted pseudo-random function in a first key generation step. sid is generated based on a target-collision resistant hash function and (sid, Rα, Rβ) is transmitted to communication devices Ui in a session ID generation step. T1 and T′ are computed based on a pseudo-random function in a representative second key generation step. Tj is computed based on the pseudo-random function in a general second key generation step. k′ is computed based on the twisted pseudo-random function and T′j is computed with respect to each j in a third key generation step. K1l and k1 are computed in a first session key generation step. A common key K2 is generated based on the pseudo-random function in a second session key generation step.

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Patent Owner(s)

  • NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fuji, Hitoshi Musashino, JP 20 129
Kawahara, Yuto Musashino, JP 14 10
Kobayashi, Tetsutaro Musashino, JP 49 236
Yoneyama, Kazuki Hitachi, JP 8 7
Yoshida, Reo Musashino, JP 26 32

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