Title:
鍵交換システム、情報処理装置、鍵交換方法及びプログラム
Document Type and Number:
Japanese Patent JP7254296
Kind Code:
B2
Abstract:
To provide an asynchronous identity-based multi-party key exchange protocol.SOLUTION: A key exchange system includes a transmitting terminal belonging to the same group, one or more receiving terminals, and an auxiliary server that assists in exchanging group keys. The transmitting terminal encrypts a group key with an encryption key provided by the auxiliary server, and transmits a first ciphertext generated so as to be encrypted with an ID-based encryption using the identification information of the receiving terminal to the auxiliary server. The auxiliary server generates a divided ciphertext divided for each of the receiving terminals from the first ciphertext received from the transmitting terminal, and transmits the divided ciphertext to the receiving terminal. The receiving terminal decrypts the divided ciphertext received from the auxiliary server with a user private key corresponding to the identification information of the receiving terminal, and acquires an encryption/decryption key. The receiving terminal requests the auxiliary server to decrypt the encryption group key. The auxiliary server transmits the decrypted group key to the receiving terminal using the decryption key corresponding to the encryption key.SELECTED DRAWING: Figure 9
Inventors:
Misato Nakabayashi
Kobayashi Tetsutaro
Hiroki Okano
Kazuki Yoneyama
Kobayashi Tetsutaro
Hiroki Okano
Kazuki Yoneyama
Application Number:
JP2019224252A
Publication Date:
April 10, 2023
Filing Date:
December 12, 2019
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
National University Corporation Ibaraki University
National University Corporation Ibaraki University
International Classes:
H04L9/08
Domestic Patent References:
| JP2019047390A | ||||
| JP2015144495A | ||||
| JP2010200210A |
Foreign References:
| US20140169556 |
Other References:
LI, F. et al.,A new multi-receiver ID-based signcryption scheme for group communications,2009 International Conference on Communications, Circuits and Systems,米国,IEEE,2009年07月23日,pp.296-300,
Attorney, Agent or Firm:
Tadashige Ito
Tadahiko Ito
Ryuji Ishihara
Tadahiko Ito
Ryuji Ishihara
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