Interests in algorithm, protocol, and application development.
Algorithmic specialties include cryptography, boolean satisfiability, and graph theory.
Research interests include logical cryptanalysis of hash functions.


Hashicorp - Senior Software Engineer - Vault CryptoSecSeptember 2021 - present

Canonical - Ubuntu Security Engineer - Certifications & ComplianceMarch 2021 - August 2021

Delivering FIPS and CIS compliance tooling to Ubuntu Advantage customers.

Red Hat - Software Engineer & Team Lead - Red Hat Certificate SystemSeptember 2018 - April 2021

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.

Red Hat - Intern - OpenSCAPJune 2018 - August 2018

Simplified SME contribution experience to the Compliance as Code project.
95 accepted pull requests to Compliance as Code and 25 accepted pull requests to
        OpenSCAP and SCAP Workbench.

Red Hat - Intern - Identity ManagementJune 2017 - August 2017

Focused on enabling Channel Bindings in MIT Kerberos.
Over 20 accepted pull requests across MIT Kerberos, gssproxy, ding-libs, python-gssapi,
        and libverto.
Contributed to improving Kerberos interactions with SSH and NFS
        (Red Hat Bugzillas #1199363, #1477231, and #1463665).

ISEAGE - Lab StaffOctober 2016 - May 2018

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.


Open-Source Contributor2010-always

Contributes to several open source projects including CryptoMiniSat, Gitea,
        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.

Collisions in Hash Functions2017 - 2018

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.

COMS 309 - EduTLS2016

TLS 1.2 library implemented in C++ as part of an API-based web framework.


Iowa State University (2015 - 2018) @ 3.75 GPA

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


ACM ICPC - North Central North America region

Fall 2017: 1st in site, 4th place overall

ΦΒΚ Junior Inductee, Spring 2017

ISEAGE Cyber Defense Competitions

ISU CDC: 5th place - Fall 2016
ISU CDC: 4th place - Spring 2016
National CDC: 1st place - 2016
ISU CDC: 2nd place - Fall 2015


Programming Languages:
C, Java, Python, Go, C++, Bash, Ansible, rpmspec, SQL, HTML5, CSS3, JSX, React, JavaScript, PHP
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

References available upon request