Method and apparatus for cryptographic protection from...

Data processing: measuring – calibrating – or testing – Measurement system – Performance or efficiency evaluation

Reexamination Certificate

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C709S227000

Reexamination Certificate

active

07139679

ABSTRACT:
A method and apparatus for protecting, from denial of service attacks, a device that provides particular services that consume substantial computational resources. A data packet is received that includes data for the particular services and a cryptographic tag. It is determined whether the data packet is legitimate based on the cryptographic tag without using the data for the particular services. If it is determined that the data packet is not legitimate, then the data is diverted from input to the particular services that process the data. These techniques use the cryptographic tag to provide strong data origin authentication without the heavy computational costs associated with providing full data integrity authentication in typical cryptographic services. Further, denial of service protection is conveniently implemented as a cryptographic service.

REFERENCES:
patent: 6834310 (2004-12-01), Munger et al.
A. Juels et al., “Client Puzzles: A Cryptographic Countermeasure Against Connection Depletion Attacks,” in S. Kent, editor,Proceedings of NDSS '99(Networks and Distributed Security Systems), pp. 151-165, 1999.
D. Dean et al., “Using Client Puzzles to Protect TLS,” 10th Annual USENIX Security Symposium, 2001.
S. Kent et al., “Security Architecture for the Internet Protocol,” IETF RFC 2401, Nov. 1998, pp. 1-66.
Cisco Systems, Inc., “IPSec,” Jan. 1997, pp. 1-10.

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