Ann Arbor, MI 48105
Ann Arbor, MI 48105
Interests in algorithm, protocol, and application development.
Algorithmic specialties include cryptography, boolean satisfiability, and graph theory.
Research interests include logical cryptanalysis of hash functions.
Delivering FIPS and CIS compliance tooling to Ubuntu Advantage customers.
Primary maintainer of JSS a NSS wrapper for Java
Major projects include developing javax.net.ssl support, extending
Java Cryptography Architecture (JCA) compatibility, and low-level algorithm enablement.
Development team lead; frequent cross-team and cross-organization contributions.
Contributor to many open source ecosystems including Dogtag PKI, FreeIPA, NSS, OpenSCAP,
MIT Kerberos, fapolicyd, rpminspect, and FreeRADIUS.
Fedora and RHEL maintainer contributing to efforts such as the Stewardship and
Java Maintenance SIGs.
Focused on enabling Channel Bindings in MIT Kerberos.
Over 20 accepted pull requests across MIT Kerberos, gssproxy, ding-libs, python-gssapi,
Contributed to improving Kerberos interactions with SSH and NFS
(Red Hat Bugzillas #1199363, #1477231, and #1463665).
ISEAGE is a security research lab at ISU which runs five Cyber Defense Competitions each year under the direction of Dr. Doug Jacobson.
Developed scenario VM images, exploitable backdoors, and competition anomalies
for use in an isolated environment.
Competition roles include Competition Director,
Red Team (volunteer hackers) Lead and Green Team (usability testing) Lead.
Multiple responsibilities including lab leadership, sponsorship activities,
and infrastructure development.
Contributes to several open source projects including CryptoMiniSat,
Let's Encrypt Boulder, cryptofuzz, and Apache Tomcat.
Publishes over 75 open-source projects including cmsh, p, sharg, SSSa libraries, and many others.
Former Ubuntu Forums contributor with over 600 posts.
Research under Dr. Eric W. Davis (Rozier) and Dr. Clifford Bergman.
Modeling collisions in hash functions as 3-CNF-SAT problems.
Deriving metrics of utilities of collisions to evaluate impact of a collision.
Analyzing breadth of collision malleability.
Improving bounds for second preimage attacks.
Contributing to open access and open source research.
"Measuring Hash Trustworthiness via Collision Utility Metrics: Logical Cryptanalysis of MD4"
A. Scheel and E. Rozier (unpublished)
Cryptographic challenges which attacking insecure assumptions. Completed 54 out of 56 problems in Go.
Various cryptographic algorithms with cross-architecture implementations in C.
TLS 1.2 library implemented in C++ as part of an API-based web framework.
Honors College Project: Collisions in Hash Functions (see above)
Degrees: Computer Science and Mathematics
Honors: ΦΒΚ Junior Inductee, Spring 2017
Honors: magna cum laude & Honors Program
Fall 2017: 1st in site, 4th place overall
ISU CDC: 5th place - Fall 2016
ISU CDC: 4th place - Spring 2016
National CDC: 1st place - 2016
ISU CDC: 2nd place - Fall 2015
Operating Systems: Fedora, RHEL, CentOS, Ubuntu, Debian, occasionally Gentoo
Orchestration: Podman, Docker, KVM, libvirt, AWS, GCE, DigitalOcean, RHEV
Project Management: Git, GitHub, Pagure, Gitea
Protocols and Encodings: TLS, Kerberos, ASN.1, XML, JSON, YAML
Editors: Atom, Brackets, Gedit, Vi, Emacs, Nano, Eclipse, Word, Google Drive
Daemons: Apache httpd, Apache Tomcat, MySQL, MariaDB, PostgreSQL, SSH, Nginx, FreeRADIUS, Kerberos