Linux

Steganography in Ubuntu/ Debian: Hiding data in images and audio files

Thursday, 17 December 2009 05:46 Joby Joseph How to ? - Linux

steganography is the technique used for hiding various data in different type of image and audio files with out changing the basic characteristics of file. Steghide is a utility for steganography. The color- respectivly sample-frequencies are not changed thus making the embedding resistant against first-order statistical tests.

Features include:
* Compression of embedded data
* Encryption of embedded data
* Embedding of a checksum to verify the integrity of the extraced data
* Support for JPEG, BMP, WAV and AU files

How to install steghide in Ubuntu / Debian
Open a terminal
$apt-get install steghide (or Use Synaptic Package Manager)

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Disable Ping Response in ubuntu

Sunday, 06 December 2009 23:30 Joby Joseph How to ? - Linux

Ping is used to check if a machine is up, Most of the hackers are using ping for finding the hackable machine. The hacking chances can be reduced by blocking ping.

in ubuntu ping can be disable by adding following line to /etc/init.d/networking (network init script)
echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_all

to re-enable

echo 0 >/proc/sys/net/ipv4/icmp_echo_ignore_all

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Last Updated on Wednesday, 09 December 2009 07:16

How to Install Skype in ubuntu 9.10 Karmic Koala

Sunday, 06 December 2009 23:25 Joby Joseph How to ? - Linux

The world famous communication software skype can easily install in ubuntu 9.10 Karmic koala with simple steps. Skype can be used for Free calls, video calls and instant messaging over the internet. Plus great value calls to phones anywhere in the world. with a broadband internet connection you can make low cost calls to land phones and mobile phones.

First you have to add medibuntu repository.
you can choose one of the following methods for adding medibuntu repository

How to install Chromium browser(Linux clone of Google Chrome) in ubuntu

Sunday, 22 November 2009 12:51 Tux How to ? - Linux

Chromium is an open-source browser project that aims to build a safer, faster, and more stable way for all Internet users to experience the web. The Chromium codebase is the basis for Google’s Chrome browser. Google has announced plans to support native Mac and Linux versions of Chromium, but they have yet to be released.To know the present status of official release of Google Chrome for Linux Click Here...

For installing Chromium go to:

System>Administration>Software Sources

and add the following source lines to it.

For ubuntu 9.10 (karmic) Users add the following two lines

deb http://ppa.launchpad.net/chromium-daily/ppa/ubuntu karmic main
 deb-src http://ppa.launchpad.net/chromium-daily/ppa/ubuntu karmic main

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Last Updated on Wednesday, 09 December 2009 16:09

How to Play DVD in Ubuntu 9.10 Karmic Koala

Friday, 13 November 2009 22:45 Joby Joseph How to ? - Linux

There is no default support od DVD in Ubuntu 9.10. You have to install the following for getting the DVD Support.

First You Have to add the medibuntu repositories. You can run the following in command mode to add the mediubuntu repositories.

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Last Updated on Friday, 13 November 2009 22:52

Convert pdf documents to jpeg images

Monday, 21 September 2009 09:27 Joby Joseph How to ? - Linux

If you want to convert your pdf document into a jpeg image, it is possible to use pdftoppm and after ppmtojpeg.

First, choose your pdf document and use:

ppm file.pdf file

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