Cryptography – Key management – Having particular key generator
Patent
1994-08-16
1996-09-03
Gregory, Bernarr E.
Cryptography
Key management
Having particular key generator
380 9, 380 49, H04L 912, H04L 900
Patent
active
055531466
ABSTRACT:
When information is to be exchanged in encrypted or unencrypted form on a per call basis between ISDN terminal equipment (15, 16; 20, 21), that is, data terminals, terminals or telecommunications systems, under the condition that the ISDN basic call procedures are available at the interfaces but supplementary services are not yet available everywhere, then, following a phase produced during the course of the call setup wherein the network (14) has already setup a connection between the calling and the called cryptographic equipment, the cryptographic equipment instead of the network control the further course of the call setup. The B-channel connection that already exists is employed for the mutual control, that is, the D-channel procedures at the ISDN terminal equipment interfaces are imaged onto B-channel procedures at the network interfaces upon employment of an expedient in-band coordination. The method can be employed in conjunction with the utilization of cryptographic equipment in ISDN.
REFERENCES:
patent: 4802220 (1989-01-01), Marker, Jr.
patent: 5216715 (1993-06-01), Markwitz
patent: 5245656 (1993-09-01), Loeb et al.
patent: 5280529 (1994-01-01), Nost
Gregory Bernarr E.
Siemens Aktiengesellschaft
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