Monitoring how much bandwidth is used is a fundamental task to check the status of your servers, or just your desktop, so i always test new tools to see if i find something good. This is the third article of this series and in this one i’ll take a look at Bmon, speedometer and Nload.
In the Indie game “The Great Jitters Pudding Panic“, done by the German developers kunst-stoff, you are a Green pudding and your goal is to exit from an haunted house without fainting from fear, while at the same time trying to scare the monsters in the maze.
It’s an uncommon subject for sure for an action puzzle game, but the game will take you from the start with his great graphics and smart puzzle, let’s see some details on this funny game. Continue reading »
While reading an interesting Blog I discovered a new treasure: TRESOR, in short TRESOR is a secure implementation of AES which is resistant against cold boot attacks and other attacks on main memory.
If like me you wonder what a cold boot attack is, Princeton University can help us :
Contrary to popular assumption, DRAMs used in most modern computers retain their contents for seconds to minutes after power is lost, even at operating temperatures and even if removed from a motherboard. Although DRAMs become less reliable when they are not refreshed, they are not immediately erased, and their contents persist sufficiently for malicious (or forensic) acquisition of usable full-system memory images. This phenomenon limits the ability of an operating system to protect cryptographic key material from an attacker with physical access. We use cold reboots to mount attacks on popular disk encryption systems — BitLocker, FileVault, dm-crypt, and TrueCrypt — using no special devices or materials. We experimentally characterize the extent and predictability of memory remanence and report that remanence times can be increased dramatically with simple techniques.
For a customer i was in need of a quick way to send an email every time his system (centos) stop, reboot or simply boot.
I’ve found an useful article http://www.syntaxtechnology.com and most of this article is based on that.
To get an email at both start up and shut down we need to write an init script. The tips below are specific to a Red Hat based system (Red Hat, Fedora, CentOS, etc) but should be fairly similar to others, depending on the boot system you’ll have to change slightly the script.
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William E. Shotts, Jr., published a few years ago a useful ebook entitled “The Linux Command Line”, a guide to learn and know more about the Command Line Interface (CLI) on GNU / Linux. The ebook is still available for download and is released under a Creative Commons license.
Although most distributions have graphical environments and interfaces for applications, the command line continues to be a useful tool to do various tasks while using the system. Even the combination of GUI and command line interface, well used, can help you to perform the tasks that you need quickly and accurately.
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