Specialties: Operating systems: MS Windows, Unix/Linux(Ubuntu) and their security issues (Hardening and Balancing).
Security appliances: Firewall (Netfilter/Iptables), IDS/IPS and encryption algorithms such AES and RSA.
Analysis and network testing tools: Tcpdump, Ethercap, Nmap, Nemesis, Snort, Sipsak.
VoIP Protocols: Q.931(ISDN), SIP and H.323.
Languages: C, SQL, PHP and XML..
Secure deleting and Data disclosure risk.