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Kompressionsverfahren (IPComp)
48 NetWAYS/ISDN – 3 Fernzugriff mit NetWAYS/ISDN
statt des sich wiederholenden Teils verwendet. Ein guter Ver-
schlüsselungsalgorithmus vermeidet jedoch weitgehend
Wiederholungen. Es wäre sonst sehr einfach, mittels statisti-
schem Wissen über die verschlüsselte Nachricht (beispiels-
weise die Sprache eines Textes und damit die häufigsten
Buchstaben) die Nachricht zu entschlüsseln. Falls dennoch
komprimiert werden soll, so muss die Kompression vor der
Verschlüsselung stattfinden. Hier bietet sich IPComp an. In-
nerhalb von IPComp sind drei Kompressionsverfahren mög-
lich:
l Deflate (RFC 2394)
l LZS (RFC 3051), wird auch bei der Stac-Compression
(RFC 1974) verwendet.
l LZJH (RFC 2395), entspricht V.44 und wird beispielswei-
se auch bei dem Modemübertragungsverfahren V.92
verwendet.
In NetWAYS/ISDN sind alle drei Verfahren implementiert.
netways.book Seite 48 Dienstag, 10. Dezember 2002 10:55 10
48


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