There is no real way to completely prevent brute-force attacks on passwords, but it is possible to mitigate the risk. Choosing suitable passwords and putting in place lockouts that restrict access after x number of failed login attempts will significantly assist in reducing the risk of brute-force attacks. Additionally, you can look at using other forms of authentication, such as two factor, rather than passwords. A number of two-factor authentication systems, like RSA's SecureID token system, are supported on Linux. Other two-factor systems are supported on Linux via PAM or RADIUS.
Dig Deeper on Linux servers
Related Q&A from James Turnbull
A user wants to implement OSSEC on a Windows server because he has no server side Linux operating system. Continue Reading
Solaris 10 Trusted Extensions and SELinux are best suited to different system requirements and administrator skill sets. Our security expert explains... Continue Reading
Configuring spam filters Spamassassin and dspam together in the email server Postfix is easy with the resources listed by our security expert. Continue Reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.