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1. (WO2003061241) SYMMETRICAL KEY ESTABLISHING USING PUBLIC KEY ENCRYPTION

Pub. No.:    WO/2003/061241    International Application No.:    PCT/JP2003/000357
Publication Date: Jul 24, 2003 International Filing Date: Jan 17, 2003
IPC: H04L 9/08
H04L 12/28
H04L 12/56
H04L 29/06
Applicants: KABUSHIKI KAISHA TOSHIBA
Inventors: FARNHAM, Timothy
YEUN, Chan, Y.
Title: SYMMETRICAL KEY ESTABLISHING USING PUBLIC KEY ENCRYPTION
Abstract:
This invention generally relates to secure communications links for data transmission and more particularly relates to data communications links in which asymmetric cryptographic techniques are used to establish a secure link using symmetric cryptography. A method of establishing a secure communications link comprising, assembling a message comprising a secret number and a digital signature for the secret number, the digital signature being generated using a private key for the server, encrypting the message at the server end of the communications link using a public key for the terminal, sending the encrypted message from the server to the terminal, decrypting the encrypted message at the terminal using a private key for the terminal, validating the message by checking the digital signature using a public key for the server, and establishing the secure communications link using the secret number, wherein the public and private keys for the terminal and server are public and private keys of an asymmetric cryptographic technique. communications system terminal.