$ cat /etc/profile/rajsegar
USER : Rajsegar Alagarathnam
LOCATION : Sunderland, UK
ROLE : Offensive Security / Penetration Tester
CLEARANCE : MSc Cyber Security (Distinction) + 4 yrs IT Ops
SPECIALTY : Web App Testing | Active Directory | Adversary Simulation
MINDSET : "Assume breach. Think like the attacker. Prove the risk."
STATUS : [ACTIVE] — preparing for CPENT certification[ OFFENSIVE ]
[ TOOLING ]
[ ENTERPRISE ]
[2025] Cybersecurity Researcher — CRAC Learning (AI Security Research) · Remote
- Researched and compared Federated Learning frameworks (TensorFlow Federated, PySyft, Flower, FATE), selecting appropriate tools for simulation and enterprise deployment.
- Implemented secure federation communications and trust controls using TLS certificates and SuperNode authentication keys, running Flower SuperLink/SuperNode with mutual TLS and public-key allowlisting.
[2022–2023] Intern System Administrator — Vital Hub Innovations Lab · Hybrid
- Administered Active Directory and Office 365: provisioning, access controls, group policies, and account lifecycle management.
- Hardened endpoints and enforced device compliance via Microsoft Intune (security baselines, patch coordination).
- Maintained VMware and Barracuda security appliances; implemented Nagios/Uptime Robot monitoring to support faster incident response.
[2022] Junior Help Desk Support Administrator — Siam City Cement Lanka Ltd
- Resolved Windows endpoint, printer, and network connectivity issues; tracked and escalated incidents in ServiceNow.
- Supported data centre operations and backup tape processes to improve disaster recovery readiness.
[2020–2022] IT Technician — ICBT Campus, Jaffna
- Maintained LAN/WAN infrastructure, printers, and servers through routine checks and troubleshooting.
- Supported Office 365 and Microsoft Teams deployments for staff and students.
| Payload | Stack | Description |
|---|---|---|
| VAPT Framework for SMEs | Metasploit Cobalt Strike |
End-to-end VAPT workflow for SMEs covering scoping, reconnaissance, validation, and evidence-based reporting with honeypot-driven analysis. (MSc Distinction project) |
| PoisonScope | TextAttack Transformers |
Detection and analysis of backdoored LLMs; robustness testing against TextFooler and DeepWordBug with documented mitigations. |
[+] TryHackMe ......... TOP 6% GLOBALLY → tryhackme.com/p/Rajsegar
[+] Security Writing .. Published write-ups → medium.com/@RajPhantomVector
[+] MSc Cyber Security DISTINCTION → University of Sunderland
education/
├── MSc Cyber Security (Distinction) — University of Sunderland, UK [2023–2024]
│ └── Pentesting & VA · Network Security · Incident Response · Secure Design
└── BSc (Hons) Business Information Systems — Cardiff Metropolitan University
[NOW] Preparing for CPENT certification
[FOCUS] Web exploitation · Active Directory attack paths · Adversary simulation
