ALEXANDRIA, Va., June 4 -- United States Patent no. 12,323,457, issued on June 3, was assigned to AT&T Intellectual Property I LP (Atlanta).
"Using proof of work for preventing distributed denial of service attacks" was invented by Mikhail Istomin (Brooklyn, N.Y.) and Paul Giura (Cohoes, N.Y.).
According to the abstract* released by the U.S. Patent & Trademark Office: "Concepts and technologies disclosed herein are directed to using proof of work for preventing distributed denial of server ("DDoS") attacks. A server system can receive a resource request from a client system. The resource request can specify a resource. The server system can determine a congestion level based upon a load metric and a threshold. In response to determining t...