@misc{JR17, author = { Ari Juels and Ronald L. Rivest }, title = { Determining authenticity based on indicators derived from information relating to historical events }, howpublished = { U.S. Patent 9,537,845. Issued January 3, 2017. }, date = { 2017-01-03 }, OPTmonth = { January 3, }, OPTyear = { 2017 }, abstract = { A method comprises storing in a memory of a first processing device information relating to one or more historical events visible to the first processing device and a second processing device. The method further comprises, in an authentication sessions between the first processing device and the second processing device, transmitting an indicator derived from at least a portion of the stored information from the first processing device to the second processing device. The indicator permits the second processing device to determine authenticity of the first processing device. }, }