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IT Defense in Depth Part II

Defense in Depth Part II

In our last blog we started talking about the different layers of security necessary to fully defendyour data and business integrity. Today we will look at the human aspect of it, and networkdefenses. The human layer refers to the activities that your employees perform. 95% of securityincidences involve human error. Ashley Schwartau of The Security Awareness Company saysthe two biggest mistakes a company can make are “assuming their employees know internalsecurity policies” and “assuming their employees care enough to follow policy”.

Here are some ways Hackers exploit human foibles:

  • guessing or brute-force solving passwords
  • tricking employees to open compromised emails or visit compromised websites
  • tricking employees to divulge sensitive information

For the human layer, you need to:

  • enforce mandatory password changes every 30 to 60 days, or after you lose an employee
  • train your employees on best practices every 6 months
  • provide incentives for security conscious behavior.
  • distribute sensitive information on a need to know basis
  • require two or more individuals to sign off on any transfers of funds,
  • watch for suspicious behavior

The network layer refers to software attacks delivered online. This is by far the most commonvector for attacks, affecting 61% of businesses last year. There are many types of malware:some will spy on you, some will siphon off funds, some will lock away your files.

However, they are all transmitted in the same way:

  • spam emails or compromised sites
  • “drive by” downloads, etc.

To protect against malware

  • Don’t use business devices on an unsecured network.
  • Don’t allow foreign devices to access your wifi network.
  • Use firewalls to protect your network
  • Make your sure your Wi­Fi network is encrypted.
  • Use antivirus software and keep it updated. Although it is not the be all, end all of security, it will protect you from the most common viruses and help you to notice irregularities
  • Use programs that detect suspicious software behavior

The mobile layer refers to the mobile devices used by you and your employees. Securityconsciousness for mobile devices often lags behind consciousness about security on otherplatforms, which is why there 11.6 million infected devices at any given moment.

There are several common vectors for compromising mobile devices

  • traditional malware
  • malicious apps
  • network threats

To protect your mobile devices you can:

  • use secure passwords
  • use encryption
  • use reputable security apps
  • enable remote wipe options.

Just as each line of defense would have been useless without an HQ to move forces to wherethey were needed most, IT defense-in-depth policy needs to have a single person, able tomonitor each layer for suspicious activity and respond accordingly.