Communications systems firewall

Details Communications systems firewall Communications systems firewall

2006-09-12

2011-10-11

Moazzami, Nasser (Department: 2436)

Information security

Access control or authentication

Network

C726S001000, C726S011000, C726S012000, C726S013000, C726S022000, C726S023000, C726S024000, C726S025000, C709S230000, C709S238000, C709S246000

Reexamination Certificate

active

08037520

ABSTRACT:
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.

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