Lyhin Security Consulting & Pentesting
I'm Sam Lyhin – Principal Cyber Risk Consultant and founder of LSCP LLC. I help businesses challenge their cyber resilience before unauthorized parties abuse the same mechanisms for their own fun and profit.
Book a consultation Three standard ways to work
Cybersecurity always changes and evolves
Things that were considered safe yesterday are a risk today. The opposite is also true: what was unacceptably risky yesterday is part of standard business practice today. Those who don't catch up either overspend or underearn.
Controls change, business contexts change, threats change – and they change fast, because that is how IT works: good people keep inventing new ways to thrive, and bad people keep inventing new ways to deceive. Between those two growing mechanisms runs cyber security, working to keep up so the smartest part of society can be fast enough to secure themselves before the criminals feast on everybody else's gatherings – and before everything changes again. This is natural.
Cybersecurity needs undivided attention
Be careful when applying cybersecurity. The good old principles of Zero Trust and Defense in Depth can either heal or kill a system, depending on how they are applied. Another example: the good old Common Vulnerability Scoring System helps grab an initial feel for an issue – but it doesn't answer which issue should be fixed first. That, by the way, is why I pioneered the Rimpact® score to measure relative impact, specifically for the penetration testing context. But, I digress: ultimately it's not a system, or a concept, or a metric that makes the difference. It's the right person with the right experience who can gently yet firmly challenge the actual cyber resilience to ensure the path forward reasonably provides the maximum benefit.
Ways to work with LSCP
Penetration testing
The gold standard for providing reasonable cybersecurity coverage of digital assets of any kind. Web, mobile, API, infrastructure, cloud, code – tested by hand, personally; High and Critical findings reported within 24 hours; re-testing terms agreed separately. The pentest page →
Private bug bounty
A bounty opened for one named researcher instead of a crowd: a small establishment fee, findings brought whole, and payment that stays at the discretion and common sense of your people, every single time. The model →
Advisory
A year of security ownership under one written budget, paid monthly like a salary: any question at any hour, scheduled pentests, incident response when it counts. How the year works →
The full shelf of standard engagements lives on the services page. Something else in offensive security? Describe the situation – the working model can be shaped to it.
Credentials
OSCP · OSCE · OSWE
OSCP – the most respected hands-on credential in the industry. OSCE – once the hardest exam in the world, since retired: the holders it has are all it will ever have. OSWE – advanced white-box exploitation: read the source code, find the flaw, write the exploit.
GMOB
GIAC Mobile Device Security Analyst – the most expensive mobile security credential in the world today. Both platforms in depth: the iOS and Android security models, static and dynamic analysis of mobile applications, reverse engineering, jailbroken and rooted devices, mobile malware, and penetration testing of mobile applications against the OWASP mobile standards.
B.S. in Applied Cryptology
A full engineering degree in the mathematics this craft stands on, earned at the Institute of Physics and Technology (IPT) at Igor Sikorsky Kyiv Polytechnic Institute. Carried into production: delivering post-quantum rollouts, ML-DSA (FIPS 204), from design advisory to post-implementation audit.
References
"You did not hand us a checklist; you gave us real insight and a practical path forward, weighed by what counts most for our business. It is rare to come away from a security review feeling more confident and genuinely well looked after. We did, and we would gladly work with LSCP again."
Yevhen Bondar – Founder, Red Phoenix Team · Jun 2026
"His expertise has been vital in laying the foundation of our cybersecurity measures and consistently improving them from the early stages of our development. Sam Lyhin has demonstrated a remarkable level of professionalism, positive attitude, and efficiency that has truly surpassed our expectations."
Edward Khodorkovsky – Director, American Fund for Ukrainian Reconstruction · Dec 2024
"We couldn't ever imagine an IT expert could be so attentive, optimistic, and knowledgeable of the industry, as Sam Lyhin. Thank you for your commitment to improve our security posture."
Andrew Rekunov – President, American Shin Karate Association · Jul 2023
★★★★★ 5.0 · Verified client review on Clutch
More references are available on request.
Outline
The faster we fix cybersecurity, the less expensive and painful it usually is. This principle is called "to shift left". This is exactly how faster decisions save resources. So:
- For a formally polished, perfectly effective process – Penetration Testing
- For proactive research – Private Bug Bounty
- For long-term reactive support – Advisory
Meanwhile – keep growing your own cybersecurity awareness:
- For tactical growth – The Security Spirit® daily video series
- For strategic, evergreen cybersecurity topics – EXP Lore Cyber® irregular podcast
- For ongoing Threat Intelligence trends – The LSCP Newsletter, monthly
- For technical hands-on skills – The Responsible Disclosure Lab (RSS feed)
Contact
Email: mail@lscp.llc
LSCP LLC – Dublin, Ohio.