Patent ID: 11902428
Assignee: NATIONAL UNIVERSITY CORPORATION TOYOHASHI UNIVERSITY OF TECHNOLOGY
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A key exchange system comprising:
a communication apparatus and another communication apparatus,
wherein the key exchange system generates a shared key for executing encrypted communication between the communication apparatus and said another communication apparatus from among a plurality of communication apparatuses according to an authenticated key exchange protocol,
the authenticated key exchange protocol uses ID-based encryption, and,
the communication apparatus comprises a memory and a processor configured to execute operations comprising:
generating a short-term private key by using a first element on coset modulo a prime number from a private key of the communication apparatus,
generating a short-term public key of the communication apparatus by using a second element on coset modulo the prime number from the short-term private key,
generating private information associated with the communication apparatus by using a third element on coset modulo the prime number from the short-term private key, a short-term public key generated by said another communication apparatus, public information associated with the communication apparatus and said another communication apparatus, and
generating the shared key for executing encrypted communication with said another communication apparatus by executing a pairing operation, wherein the pairing operation comprises computing on an elliptic curve using the private key of the communication apparatus and the private information associated with the communication apparatus.