From your CEO to your mail clerk, insiders can do more harm than outside hackers.  Below are 10 tips to reduce your risk.

1. Security Policy - Create security policy for your company to detect and prevent misuse as well as guidelines for internal investigations.  Make sure your policy addresses personal information limitations such as employee's social security number, salaries, addresses, medical records, etc.
2. Physical Security - Make sure your critical infrastructure has restricted access to people.  Simply installing locked entry on the computer room is often enough to prevent most  insider incidents.
3. Check New Hires - The more you know about applicant's background the better.  Spend some time and money and screen potential employees before you bring them on board.
4. Use Strong Authentication - On particularly sensitive systems, such as HR and accounting, make sure to use a combination of password and token security.  Though it may not solve all of the problems, it is harder to fool.
5. Secure Workstations - Make sure that user's computers lock down after certain amount of inactivity.
6. Segment LAN - In a large network it makes good sense to segregate the LAN in series of sub networks, each one with its firewall established where it connects with the corporate backbone.
7. Stop Information Leaks - Establish clear policies describing restrictions on disseminating confidential information.
8. Log Internal Operations - Most companies don't have sufficient logging of their internal operations.  If possible, invest in network monitoring tool, such as NetIntercept which can analyze the flow of information throughout the network.
9. Internal Patching - Apply latest patches ands can your most critical servers, like e-mail, web and fileservers with anti-virus software regularly.
10. Monitor for Misuse - Install video monitoring and keystroke logging on the the critical servers

To read some of the computer intrusion cases visit Cyber Crime

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