In a point of view a user I’ve never use and Antivirus since I start using Fedora 14 and I don’t found any problem at all during this years, most user use antivirus to find out windows virus that come accros into his/her e-mail box
Talking about why linux is so secure?, development in linux the program or project flow for different phases from programming … packing … releasing … etc → too many eyes on it.
Talking about Hardering, you can have action to prevent:
- Disk encryption
- Keep always the system up to date
- Disable un-neccesasry service like ftp, etc
- Check Open Ports, don’t expose your box outside
- Don’t disable SElinux
- Don’t execute Script that you don’t know the procedence
- if you use ssh change the default port for something else
- Enable firewall