AUTHENTICATION METHOD AND SYSTEM

Japanese Patent JP3421977

B2

PROBLEM TO BE SOLVED: To allow a specific subscriber to be authenticated for receiving the service of a plurality of communication enterprises (so-called roaming) by sending a ciphered signal from a 1st communication network and using a tentative authentication key in a 2nd communication network so as to authenticate the subscriber based on a signal resulting from decoding the ciphered signal by the subscriber.
SOLUTION: A 2nd network receiving an identification number ID from a subscriber 300 sends the ID to a 1st network (S202). The 1st network generates a tentative anthetication key Kt and sends an authentication signal ciphered by issuing an authentication key K13 shared in common among subscribers 300 to the 2nd network (S203). The 2nd network generates a random number and sends the random number and the authentication number to the subscriber 300 (S204). The subscriber 300 uses the authentication key K13 to decode a tentative authentication key Kt and ciphers the random number to generate an authentication reply signal and returns the authentication reply signal to the 2nd network (S205). The 2nd network collates the authentication reply signal with the value resulting from ciphering the random number and authenticates the subscriber 300 to be a regular subscriber when they are coincident.

Kazuhiko Nakata
Shigefusa Suzuki
Takao Nakanishi

JP14769996A

June 30, 2003

June 10, 1996

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Nippon Telegraph and Telephone Corporation
NTT COMWARE CORPORATION

G09C1/00; H04L9/32; H04W8/12; H04W12/04; H04L9/08; H04W12/06; (IPC1-7): H04Q7/38; G09C1/00; H04L9/08; H04L9/32

JP4352525A
JP759154A
JP5250326A

Tadahiko Ito

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