The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 2015
Filed:
Jan. 10, 2011
Thierry C. Bessis, Naperville, IL (US);
Ashwin V. Rana, Plano, TX (US);
Thierry C. Bessis, Naperville, IL (US);
Ashwin V. Rana, Plano, TX (US);
Alcatel Lucent, Boulogne-Billancourt, FR;
Abstract
A SIP firewall defends an IMS network against SIP registration-based DoS/DDoS attacks by issuing fake authentication challenges when suspiciously high registration traffic is present. The fake authentication challenges include a predictive nonce that is to be used in the challenge response, thus forcing users to be state-aware and to issue the SIP registration requests from valid IP address in order to successfully respond to the fake authentication challenges. Upon confirming an association between the challenge response and the fake authentication challenges, the firewall opens a registration window to a protected node of the core network. In such manner, the firewall opens a registration window to (unauthenticated) legitimate users while stopping DDoS mode of registrations (or at least making them extremely difficult and costly) without impacting or involving the protected node.