Archive for the ‘Linux’ Category

TrueCrypt

TrueCrypt is a powerful yet free Open-Source disk encryption Software. I am quite satisfied with the software that I decided to introduce it here in my blog, may all future releases remain free to use!

With TrueCrypt you can maintain an on-the-fly-encrypted volume (data storage device). On their website they explain ‘On-the-fly encryption’ as an automatic continuing encryption process to data right before it is saved and decrypted right after it is loaded. In simple words, you will end up having an encrypted volume to secure all your sensitive data inside. This volume can be mounted and accesses like any regular folder in your system each time you provide the right password and then dismounted to prevent access.

What I personally think makes this software special is the ease of using encrypted files right from the secured volume to the computer’s RAM. As such, if you have a video file, you will not wait until it is fully decrypted to play it, instead the stream will be decrypted right into the RAM while playing, the performance and speed is quite similar to playing any regular video file you have on your system. Brilliant, isn’t it?
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Unlike Telnet, Secure Shell (SSH) encrypts the connection between the remotely connected hosts and doesnt trransfer your password in plain text. As such SSH is more secure and must be used for remote connections. In this post I will install, configure and connect 2 computers running Ubuntu and CentOS. The connection will be tested with a password-based authentication followed by using public and private key pairs to establish trust between the hosts.

To start this trial, install OpenSSH server and client to Ubuntu using:
P.S. make sure you login as root when required.

apt-get install openssh-client
apt-get install openssh-server

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This article is for you if you have internet connection in your Windows and would like to share it with a Linux box as well. To do that your windows machine should have two network cards connected, one for the internet service and the other one to connect to your other machine or to a hub/switch if you want to share it with more computers.

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You first need to download BackTrack’s VMWare Image for the final available release from the following link:

http://www.backtrack-linux.org/downloads/

At the time of writing this post the final release is BackTrack 4 so the download gave me the following zip file:

bt4-final-vm.zip

Now we should do the following:

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