Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1996-04-16
1998-01-13
Cain, David C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 49, H04K 100
Patent
active
057087130
ABSTRACT:
Prior art methods used for monitoring, via monitoring means, signals which are to be transmitted via telecommunication links and with said signals each comprising a signalling signal and a content signal, require that the processing means which are required for monitoring are either situated in the vicinity of the monitoring means or must be coupled to the monitoring means via leased-lines. By having the monitoring means generate a further signalling signal, dependent upon a code word related to a signalling signal, and consequently transmitting, dependent upon the further signalling signal, a content signal which is to be monitored to the processing means, a substantial more efficient method is obtained as both means can be coupled via a public telephony network.
Furthermore, the possibility arises not only to transmit a content signal which is to be monitored to the processing means but also a signalling signal, especially if the telephony network is a so-called ISDN network which uses one or two B channels and one D channel for each telecommunication link which has been established and has to be monitored.
REFERENCES:
patent: 5361062 (1994-11-01), Weiss et al.
Cain David C.
Koninklijke PTT Nederland N.V.
Michaelson Peter L.
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