Date Added: Oct 2012
The Internet has become essential to most enterprises and many private individuals. However, both network and the computer systems connected to it are still vulnerable to attacks which are becoming more frequent than ever. To face this situation, traditional security techniques are insufficient and fault-tolerance techniques are becoming increasingly cost-effective. Nevertheless, intrusions are very special faults, and this has to be taken into account when selecting the fault-tolerance techniques. In classical dependability, fault tolerance has been the workhorse of many solutions. Classical security-related has less privileged solutions with a few exceptions towards intrusion detection and prevention. The paper focuses on the fundamental concepts fault tolerance and security.