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Cyber Security & Network Forensics Team

In today’s interconnected digital landscape, cyber threats pose unprecedented risks to organizations of all sizes. SI Global Partners’ Cyber Security & Network Forensics Team combines cutting-edge technology with deep technical expertise to protect your digital assets and investigate cyber incidents. Our team of certified forensic specialists and cybersecurity professionals brings extensive experience from government agencies, law enforcement, and elite private sector organizations.

We deliver comprehensive cybersecurity solutions that span prevention, detection, response, and recovery. From advanced threat hunting and digital forensics to incident response and expert witness testimony, our Team provides the technical depth and investigative rigor required to address the most sophisticated cyber threats. Whether you are facing an active breach, need to strengthen your security posture, or require forensic evidence for legal proceedings, we provide the expertise and tools necessary to protect your organization’s digital infrastructure and restore confidence in your security operations.

YALKIN DEMIRKAYA

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Integrity First

Expert-Led

Evidence You Can Trust

Core Services

Digital Forensics & Investigation

  • Digital Evidence Acquisition – Forensically sound data collection from computers, mobile devices, cloud platforms, and embedded systems
  • Network & Mobile Forensics – Traffic analysis, device imaging, deleted data recovery, and communication investigation
  • Cloud & Memory Forensics – Multi-cloud investigation, RAM analysis, and malware persistence detection
  • Database Forensics – Intrusion analysis, data tampering detection, and unauthorized access investigation

Threat Detection & Analysis

  • Advanced Threat Hunting – APT detection, behavioral anomaly identification, and zero-day discovery
  • Security Monitoring (SIEM/EDR) – Log correlation, endpoint monitoring, automated threat containment, and threat intelligence integration
  • Malware Analysis – Static/dynamic analysis, reverse engineering, APT investigation, and vulnerability research
  • Code Security Review – Comprehensive auditing, vulnerability identification, and remediation guidance

Legal & Compliance Services

  • E-Discovery Management – Data identification, preservation, processing, and court-admissible reporting
  • Expert Witness Services – Technical testimony, court support, and case consultation
  • Regulatory Compliance – GDPR/HIPAA/SOX investigation, audit support, and breach response

Security Testing & Assessment

  • Comprehensive Infrastructure Penetration Testing – Network perimeter testing, internal network assessment, wireless security evaluation, and physical security testing

Incident Response & Crisis Management

  • 24/7 Emergency Response – Immediate containment, threat assessment, and stakeholder communication
  • Breach Investigation – Complete attack timeline reconstruction, impact assessment, root cause analysis, and remediation planning
  • Malware Containment & Removal – Advanced threat isolation, system cleaning, infrastructure hardening, and system recovery verification
  • Business Continuity Support – System restoration and operational resilience planning
  • Data Exfiltration Analysis – Stolen data identification, exfiltration method analysis, exposure assessment, and notification requirement determination

Specialized Services

  • Insider Threat Analysis – User activity analysis, anomalous behavior detection, privilege escalation monitoring, and data access pattern evaluation
  • Industrial Security (ICS/SCADA) – Critical infrastructure protection and operational technology assessment

Yalkin Demirkaya Sr.

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Managing Director Cyber Security & Network Forensics

Yalkin Demirkaya Sr. is a globally recognized cybersecurity expert with over forty years of computer experience and two decades of distinguished law enforcement service. He brings unparalleled expertise to complex cybersecurity challenges, digital forensics, and eDiscovery matters.
Yalkin served with distinction as a Detective Investigator and Detective Commander with the New York Police Department, where he pioneered groundbreaking work in digital investigations. He founded and commanded the Computer Crimes Investigation Unit of the Internal Affairs Bureau—the first such unit dedicated to internal investigations in the government sector. In this role, he also served as Chief Information Officer (CIO) and Chief Information Security Officer (CISO), establishing policies and investigative procedures that set new standards in the field.
With over four decades of experience,Yalkin has developed and perfected investigative techniques for computer crime investigations that are now used worldwide. He has successfully investigated and recovered critical evidence in numerous high-profile cases across the United States, Europe, and Asia. His deep understanding of electronic evidence rules spans multiple jurisdictions, including the U.S., European Union, and individual countries such as Italy, France, and England.
Mr. Demirkaya provides expert testimony and consulting services across multiple domains:
  • Cyber Crime Investigations – Conducting and supervising hundreds of investigations globally
  • Digital & Network Forensics – Expert examination and evidence recovery
  • Incident Response – Rapid response and mitigation strategies
  • eDiscovery Consulting – Combining technical expertise with knowledge of Federal Rules of Civil Procedure
  • IT Security Assessment – Certified by the U.S. National Security Agency (NSA)
Yalkin is also a lecturer and trainer, providing instruction to law enforcement agencies, legal professionals, academic institutions, and business communities worldwide. His training programs cover cybercrime investigations, cyber incident response, digital forensics, network forensics, and computer security.
He holds a Master’s degree in Criminal Justice and Computer Science and a Bachelor’s degree in Police Science and Criminology, both with honors from CUNY John Jay College of Criminal Justice.