Communications systems firewall

H - Electricity – 04 – L

Patent

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Details

H04L 29/06 (2006.01)

Patent

CA 2621625

Methods, apparatus, programs. and signals for providing communications network security. The approach is based on using established "standard" protocols, but packets (or cells or frames) are deliberately malformed by the sender, optionally according to a predetermined rule (for example by inverting a packet check digit). A filter forwards only packets identified as being invalid, optionally in accordance with the rule; packets which are valid with respect to the "standard" protocol are dropped. The filter is preferably implemented in hardware to mitigate the risk of its being compromised by a malicious attack.

L'invention concerne des procédés, un dispositif, des programmes et des signaux dédiés à la sécurité des réseaux de transmission. Cette approche repose sur l'utilisation de protocoles <= standards >= établis, les paquets (ou cellules ou trames) étant cependantdélibérément mal construits par l'expéditeur, éventuellement en accord avec une règle prédéterminée (par exemple, en inversant le chiffre de contrôle d'un paquet). Un filtre ne réachemine que les paquets identifiés comme étant valides, éventuellement en accord avec la règle en question; les paquets valides selon le protocole <= standard >= étant rejetés. De préférence, le filtre est mis en oeuvre dans le matériel pour éliminer tout risque de nuisance dû à une attaque malveillante.

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