Title:
COMMUNICATION SYSTEM AND COMMUNICATION METHOD
Document Type and Number:
WIPO Patent Application WO/2024/042584
Kind Code:
A1
Abstract:
The present invention prevents key exchange from being performed except with a pair of the latest short-term public key and counterpart identification information, when using ID-based cryptographic technology. A client terminal 7 receives a first long-term private key and a prescribed nonce received from a KGC server 3 and based on the latest time (S23), uses the first long-term private key to generate a first short-term private key and a first short-term public key (S24), and transmits, to a prescribed server, the first short-term public key and terminal identification information to which a first nonce is added and which is for identifying the client terminal (S25). A prescribed server 5 receives a second long-term private key and the prescribed nonce received from the KGC server 3 (S12), confirms, on the basis of whether or not the first nonce transmitted by the first transmission process is the same as the prescribed nonce, whether or not the first nonce is based on the latest time (S26), and does not generate a second short-term public key if the first nonce is not based on the latest time (S27).
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Inventors:
MURAKAMI KEIZO (JP)
Application Number:
PCT/JP2022/031583
Publication Date:
February 29, 2024
Filing Date:
August 22, 2022
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H04L9/08
Domestic Patent References:
| WO2022091183A1 | 2022-05-05 | |||
| WO2021010444A1 | 2021-01-21 |
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
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