Secret hashing for TCP SYN/FIN correspondence
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United States of America Patent
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May 13, 2008
Grant Date -
Dec 4, 2003
app pub date -
Dec 12, 2002
filing date -
May 31, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A mechanism for detecting denial of service attacks in a digital communications system is described. A probabilistically determined portion of input packets of a connection are processed using a hash function to determine whether the packets belong to the flow initiated by a TCP SYN packet. The hash function includes a secret key for additional security. The result of the hash function is added to a value which is dependent on the sequence number of a packet being processed.
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