The authors work within the Information Technology Laboratory at the National Institute of Standards and Technology (NIST). Kristen is a Cognitive Scientist in NIST's Information Access Division and holds an M.A. and Ph.D. in Cognitive Psychology from Rice University. Joshua is an Information Security Engineer within NIST's Computer Security Division. Joshua graduated from George Mason University with a M.S. in Information Security and Assurance. John Kelsey is an experienced cryptographer at NIST and has degrees in Computer Science and Economics from the University of Missouri Columbia.