My research interests are in network measurement and anti-abuse for improved stability and security of the Internet. I lead the Internet Measurement and Anti-Abuse Laboratory (IMAAL). Our research includes (but is not limited to) the following areas:

  • DNS/DNSSEC deployment and measurement
  • IPv6 deployment and measurement
  • DDoS prevention and mitigation techniques


  • Our paper on SPF validation was recently accepted to CoNEXT 2021!
  • Our paper on network security was recently accepted to ICNP 2021!
  • Our paper measuring DNS cookie usage was recently accepted to PAM 2021!
  • Our paper on network security was recently accepted to IMC 2020!
  • Our paper on DNS privacy was recently accepted to CoNEXT 2019!
  • Our paper on NSEC3 zone size detection was recently accepted to PAM 2019!
  • Profs. Bryant and O'Hallaron at CMU recently featured in a blog post the little Computer Systems-based song I wrote and performed with some BYU Computer Science students.
  • BYU's College of Physical and Mathematical Sciences recently featured my work in an article.
  • The Computer Science department published a "Meet our new professor" article.

Recent Publications

Conference Proceedings

  • Casey Deccio, Tarun Yadav, Nathaniel Bennett, Alden Hilton, Michael Howe, Tanner Norton, Jacob Rohde, Eunice Tan, and Bradley Taylor. Measuring Email Sender Validation in the Wild. CoNEXT 2021.
  • Jacob Davis and Casey Deccio. Advertising DNS Protocol Use to Mitigate DDoS Attacks. ICNP 2021.
  • Jacob Davis and Casey Deccio. A Peek Into the DNS Cookie Jar: An Analysis of DNS Cookie Use. PAM 2021.
  • Casey Deccio, Alden Hilton, Michael Briggs, Trevin Avery, and Robert Richardson. Behind Closed Doors: A Network Tale of Spoofing, Intrusion, and False DNS Security. IMC 2020.
  • Casey Deccio and Jacob Davis. DNS Privacy in Practice and Preparation. CoNEXT 2019.
  • Jonathan Demke and Casey Deccio. On DNSSEC Negative Responses, Lies, and Zone Size Detection. PAM 2019.
  • Casey Deccio. DNS Diagnostics through the Eye of the Beholder. ICNC 2019 NAPE.
  • Casey Deccio, Derek Argueta, and Jonathan Demke. A Quantitative Study of the Deployment of DNS Rate Limiting. ICNC 2019 CIS.
  • Casey Deccio, Jeff Sedayao, Krishna Kant, Prasant Mohapatra. Quantifying and Improving DNSSEC Availability. ICCCN 2011.
  • Casey Deccio, Jeff Sedayao, Krishna Kant, Prasant Mohapatra. Measuring Availability in the Domain Name System. IEEE INFOCOM 2010.
  • Casey Deccio, Chao-Chih Chen, Jeff Sedayao, Krishna Kant, Prasant Mohapatra. Quality of Name Resolution in the Domain Name System. IEEE ICNP 2009.
  • Casey Deccio, Joseph Ekstrom, Charles Knutson, D. Ryan Partridge, Kevin Tew. A Study of the Suitability of IrOBEX for High-Speed Exchange of Large Data Objects. GLOBECOM 2003.

Journal Articles

  • Casey Deccio. Maintenance, Mishaps and Mending in Deployments of the Domain Name System Security Extensions (DNSSEC). International Journal of Critical Infrastructure Protection. Jul 2012.
  • Casey Deccio, Jeff Sedayao, Krishna Kant, Prasant Mohapatra. Quantifying DNS Namespace Influence. Computer Networks. Feb 2012.

Books and Book Chapters

  • Krishna Kant, Casey Deccio. Security and Robustness in the Internet Infrastructure. In Handbook on Securing Cyber-Physical Critical Infrastructure. Morgan Kaufman (2012), Waltham, MA. pp. 705-733.
  • Casey Deccio. Quantifying and Improving DNS Availability. PhD Dissertation. University of California Davis, 2010.


  • Comcast. We gratefully acknowledge Comcast for generous sponsorship from the Comcast Innovation Fund in 2019, 2020, and 2021.
  • Verisign. We gratefully acknowledge VeriSign, Inc., for the grant used to support our research (2019, 2020, 2021).


Current Students

  • Kimball Leavitt (BA, MS)
  • Tyler Karren (MS)
  • Nathan Craddock (BS)
  • Jamison Lofthouse (BS)
  • Dallan Adamson (BS)
  • Rebekah Johnson (BS)
  • Nathan Larsen (BS)
  • Eric Spencer (BS)

Past Students

  • Trevin Avery (MS 2021)
  • Alden Hilton (BS, MS 2021)
  • Jacob Davis (BS, MS 2021)
  • Joel Hirschmann (BS)
  • Jason Anderson (BS)
  • Michael Howe (BS)
  • Bradley Taylor (BS)
  • Leah Roberts (Honors Thesis 2021)
  • Nathaniel Bennett (BS)
  • Evan Smith (BS)
  • Alyssa Rogers (BS)
  • Michael Briggs (BS)
  • Torsten Gang (BS)
  • Xin Zhao (BS)
  • Johnny Huang (BS)
  • Jacob Rohde (BS)
  • Kwan Ko (BS)
  • Ethan Rowe (BS)
  • Tyler Brady (BS)
  • Shawn Li (BS)
  • Charles Tolley (BS)
  • Tanner Norton (BS)
  • Cade Daniel (BS)
  • Luke Summers (BS)
  • Kenneth Stocks (BS)
  • Darren Remund (BS)
  • Derek Argueta (BS)
  • Jack Demke (BS)
  • Eunice Tan (MS 2018)


  • CS 460 - Fall 2021
  • CS 324 - Winter 2021
  • CS 660 - Winter 2021
  • CS 142 - Fall 2020
  • CS 460 - Fall 2020
  • CS 660 - Winter 2020
  • CS 324 - Winter 2020
  • CS 460 - Fall 2019
  • CS 660 - Winter 2019
  • CS 324 - Winter 2019
  • CS 460 - Fall 2018
  • CS 324 - Winter 2018
  • CS 460 - Fall 2017
  • CS 360 - Winter 2017


Dr. Casey Deccio is an Assistant Professor in the Computer Science Department at Brigham Young University (BYU). He earned B.S. and M.S. degrees in Computer Science from BYU in 2002 and 2004, respectively, and received a Ph.D. from UC Davis, in Computer Science, in 2010.

Prior to coming to BYU, Dr. Deccio was a Senior Research Scientist at Verisign Labs since 2014, where his research included DNS ecosystem tools, monitoring, measurement, and modeling, with the objective of increasing stability, security, and safety of the Internet. Before that he was a Principal Research and Development Cyber Security Staff member at Sandia National Laboratories, where he had been employed since 2004 and where he was responsible for network-related research and development, including DNSSEC and IPv6 deployment efforts. While at Sandia he developed DNSViz, the widely used tool for DNS analysis and visualization. He also served as an ICANN Research Fellow supporting the Security and Stability Advisory Committee (SSAC) in 2013.

Outside of work, he enjoys making music and participating in recreational activities with his wife and five children.


I sing barbershop with a number of BYU Computer Science students in a group called Sing++. Here is a musical tribute to my systems class.