Computer networks that are currently connected to the Internet are vulnerable to a variety of exploits that can compromise their intended operations. Systems can be subject to Denial of Service Attacks that prevents other computers from connecting to them for their provided service (e.g. web server) or prevent them from connecting to other computers on … Read more
It is possible that email and browser-based viruses, Trojans and worms are the source of the myth that Windows is attacked more often than Linux. Clearly there are more desktop installations of Windows than Linux. It is certainly possible, if not probable, that Windows desktop software is attacked more often because Windows dominates the desktop. … Read more
HOW TO SET UP A FIREWALL UNDER LINUX? To configure a Linux firewall, you will likely use the latest implementation of firewalling, called IPTables. IPTables is a packet filter for kernels 2.4 and above. It is a tremendous improvement over IPChains and provides enhanced features such as stateful packet filtering, Network Address Translation, MAC Address … Read more
/etc/passwd is a text file that contains the attributes of (i.e., basic information about) each user or account on a computer running Linux or another Unix-like operating system. DESIGN The permissions for /etc/passwd are by default set so that it is world readable, that is, so that it can be read by any user on … Read more
SHADOW FILE In Unix-like operating systems, /etc/shadow is used to increase the security level of passwords by restricting all but highly privileged users’ access to hashed password data. Typically, that data is kept in files owned by and accessible only by the super user. DESIGN Systems administrators can reduce the likelihood of brute force attacks … Read more
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