ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,537,808, issued on Jan. 27, was assigned to Amazon Technologies Inc. (Reno, Nev.).

"Bandwidth intensive challenge-response authentication" was invented by Emil Anders Hernvall (Vallingby, Sweden) and Vignesh Chockalingam Subramanian (Lynwood, Wash.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Approaches presented herein relate to human authentication in a computerized environment. In particular, challenge-response authentication can be performed where a requestor must submit a correct and valid response. An automated attack on such an environment may use a proxy network to cause a large number of malicious requests to be received to the environment, o...