Protection against denial of service attacks
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 1, 2009
Grant Date -
Jun 10, 2004
app pub date -
Dec 4, 2002
filing date -
Dec 4, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An information processing system for protecting against denial of service attacks comprises an interface (310) to receive and send packets, wherein the packets comprise at least one synchronization packet that is part of a handshake process for establishing the connection between the source client computer (118) and the target server computer (102); a crypto engine (306) adapted to create a unique sequence number for inclusion in a packet to be sent to a client (118) requesting establishment of a connection between a client (118) and server (102), wherein the crypto engine (306) is further adapted to validate unique sequence numbers in received synchronization packets that are part of a handshake process for establishing the connection between the source client (118) and the protected server (102); and a lookup table (304) for storing information defining established connections between the server (102) and clients so that arriving packets that purport to be part of an established connection can be validated by comparing information in the packet with entries in the table.
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