Secret hashing for TCP SYN/FIN correspondence

Details Secret hashing for TCP SYN/FIN correspondence Secret hashing for TCP SYN/FIN correspondence

2007-10-16

2007-10-16

Moise, Emmanuel L. (Department: 2137)

Information security

Monitoring or scanning of software or data including attack...

C726S011000

Reexamination Certificate

active

10158115

ABSTRACT:
Methods of preventing flooding-type denial-of-service attacks in a computer-based network are described. Connection establishing messages known as SYN packets are matched with connection terminating messages (FIN packets) by using a hash algorithm. The hash algorithm or message digest uses source and destination IP addresses, port numbers, and a secret key as input parameters. The SYN packets and FIN packets are mapped to buckets using the hash algorithm and statistics are maintained for each bucket. A correspondence between SYN packets and FIN packets is maintained to close a security hole.

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“Detecting SYN Flooding Attacks”, Haining Wang et al., 2002 IEEE.

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