Trusted Expertise for Informed Defense
Solutions for Testing, Compliance, and Peace of Mind
Network and Application Penetration Testing
Simulate real-world attacks to identify vulnerabilities and reinforce your defense strategy.
Cloud and Identity Security Architecture Reviews
Structured reviews of security architecture, network segmentation, and Zero Trust designs.
Regulatory and Compliance Alignment
Validate technical controls, identify gaps, and provide evidence-based findings that support GRC efforts.
Principal-led penetration testing and security architecture reviews
Comprehensive Cybersecurity Assessments for Modern Threats
20+ Years
Offensive Security
Experience
Crystal Defense is a small, specialized security consultancy focused on practical, high-impact testing. Every engagement is led by an experienced practitioner. We help engineering and business leaders understand their real attack surface, prioritize the issues that matter, and strengthen defenses without disrupting the business.
Robust Cybersecurity Assessments for Today’s Threats
Crystal Defense delivers focused, time-bounded security assessments designed to provide meaningful results without unnecessary complexity. We conduct network, cloud, and web application penetration tests to identify exploitable vulnerabilities, validate attack paths, and assess the effectiveness of existing security controls. Engagements are scoped to emphasize realism, accuracy, and impact rather than volume-driven findings.
Penetration Testing
Web Application and API Testing
Cloud Security Assessments
Identity and Access Assessments
Security Architecture Reviews
Clear, Actionable Reporting
Defending Businesses With Expertise And Innovation
Crystal Defense was founded by Thomas Wilhelm, a cybersecurity professional with more than 25 years of experience in offensive and defensive security. Thomas holds certifications including CISSP, CCSP, AWS Security Specialty, AWS Solutions Architect, CySA+, and Security+, and continues to work directly on client assessments rather than only managing from a distance.
Crystal Defense is intentionally small. The focus is on depth, quality, and long-term relationships with clients who value clear thinking and honest assessments.
If you are considering a penetration test, security assessment, or architecture review and want a realistic, senior-level perspective, we are happy to talk through options.