Cryptography – Key management – Having particular key generator
Patent
1993-06-15
1994-05-03
Cangialosi, Salvatore
Cryptography
Key management
Having particular key generator
380 23, 380 25, H04L 900
Patent
active
053095162
ABSTRACT:
Method and system which permit, among a plurality of terminals, group cipher communication from a desired terminal to a number of desired terminals while ensuring safety of security. A plurality of secret values called master keys which are common to a predetermined subset of IC cards are stored in an IC card. A terminal initially starting communication generates a destination indicator to transmit it to other terminals, selects one of a plurality of master keys stored in an IC card on the basis of the destination indicator, generates a group key by using the selected master key, and performs encipherment and decipherment of a communication message by using the generated group key to carry out broadcast. A terminal standing for a destination receives the destination indicator, selects one of a plurality of master keys on the basis of the destination indicator, generates the group key on the basis of the selected master key and performs encipherment and decipherment of the communication message by using the generated group key.
REFERENCES:
patent: 4531020 (1985-07-01), Wechselberger et al.
patent: 4531021 (1985-07-01), Bluestein et al.
patent: 4578530 (1986-05-01), Zeidler
patent: 4650975 (1987-03-01), Kitchener
patent: 4731840 (1988-03-01), Mniszewski et al.
patent: 4982429 (1991-01-01), Takaragi et al.
patent: 5016276 (1991-05-01), Matumoto et al.
patent: 5081677 (1992-01-01), Green et al.
patent: 5117458 (1992-05-01), Takaragi et al.
patent: 5218638 (1993-06-01), Matsumoto et al.
"Security by Card" Takaragi et al. (Aug. 19, 1991) Japan Symposium of Safety & Reliability for communication Network in IEI Com. Eng. pp. 11-20.
"Cryptograhic Method & Application" Institute of Inf. Process. Soc. Japan (Jun. 1991) pp. 714-723.
Matsumoto Hiroshi
Nakamura Tsutomu
Susaki Seiichi
Takaragi Kazuo
Cangialosi Salvatore
Hitachi , Ltd.
Hitachi Chubu Software Ltd.
LandOfFree
Group cipher communication method and group cipher communication does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Group cipher communication method and group cipher communication, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Group cipher communication method and group cipher communication will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2121831