Showing posts with label Data Safety. Show all posts
Showing posts with label Data Safety. Show all posts
ashar_oz Wednesday, June 8, 2011 at 12:20

Cryptkeeper : Create Encrypted / Password Folder Easier

Personal space is become important when we work with many people using public things like office computers, I figured it would be good to post something to help you keep your information safe. There is simple tips how to securing your folder using password and encrypted folder, this tips we pick from my friend blog Mr.Reza Ervani.

Today we will show you how some application named Cyptkeeper, Cryptkeeper is a GNOME applet for managing EncFS encrypted folders, this application is defaultly available in ubuntu 11.04 repository (and previous release i thing) so you can install easily trough apt-get or Ubuntu Software Center, read following step :

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ashar_oz Saturday, July 31, 2010 at 10:51

Exploring exif data, how did it read and manipulated ?


Exchangeable image file format (Exif) is a specification for the image file format used (mostly) by digital cameras. Exif is metadata hidden behind an image/audio/video created by device while image being taken, exif data is introduced by the Japan Electronic Industries Development Association (JEIDA) with purpose to encourage interoperability between imaging devices. learning exif data is part of digital forensic studies, trough exif data we learn when was image is being taken, what device is use to take, and what is being manipulated.   

What information inside Exif data ?
Exif usually contain of supporting information of file, that information can be [1] Date and time information, digital cameras will record the current date and time and save this in the metadata.[2] Camera settings, the information of camera setting includes static information such as the camera model and make, and information that varies with each image such as orientation, aperture, shutter speed, focal length, metering mode, and ISO speed information. [3] A thumbnail for previewing the picture on the camera's LCD screen, in file managers, or in photo manipulation software, if a file was being manipulated the data will be shown here. And the last information of exif data is [4] Descriptions and copyright information, this case not created by imaging device but it created by application like a photo editor.

How to read exif data on Ubuntu Linux ?
Reading exif data is quiet simple in ubuntu, we have application called exiftool (also available in windows/machintos) which can help us to read, write, and edit metadata on exif data. to install exiftool we can use the synaptics package manager or go to official exiftool website to download and install. exiftool is command-line application which run on terminal, to running this application we can use this syntax synopsis.
exiftool [OPTIONS] FILE
as case studies, we will try to use this application to analyze image then see what hidden information behind them, we have two identic image and one which of them is has being edited by image editor application, let see what goes in their metadata :

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ashar_oz Wednesday, July 21, 2010 at 13:33

How to build reliable backup and restore system using rsync


Data is an important asset owned by company, data which is the raw of information require a necessary method how keep and preserve well, to reduce the impact of damage and data loss which possibility occur. Backup and restore procedure that a part of disaster recovery planning is one of the way that can be perform to reduce the impact of data disaster. From statement above we can conclude that  all of us need to ensure all important data of us or our company must be backup well. And now the answer is, how to design a reliable backup and restore system which can run on linux ?
To design or build backup and restore system we must have reliable tool to move data from source to destination via network, lucky we have rsync running in linux operating system. Rsync is such application which can move data (use incremental method) from one computer to another through ftp, scp, and ssh, rsync is small and multi perform application which can be use as server or client.  

Step 1
First time before you start build a system we must describe what system we want to build otherwords describe fungsional and non fungsional sytem requirement then design the layout of application.

Step 2
Step 2 we must prepare our system and install all required application, for this section for required application we can install ssh-server, mysql5.0-server, and rsync as main application. with no less important  don't forget to describe supporting factors such database design, working directory, and previllages user to run.

Step 3
Important part of backup and restore system is script to copy/move data form one computer to another, for this section i have provide some script write in bash language that found in internet then modified it then you can download by following this link. Maybe you can't use script given directly, you can modified that script and fit to your system.  I will give explanation to have clear illustration, you can open the script while read this.
  • This script is running by cron, work valid by parameter save in file (/var/www/LIBT/exec/. That file configuration contain of  backup parameter such us name of session, rsync parameter, source and destination mechines. this file writen by application interface (you can build by your self) which help user to descibe backup session they want to build.
  • This script work to manage/colaborate supported application like rsync, mv, cp, mysql, chmod, chown, etc.
  • Plot of backup procedure of this script is  -- [read configuration file] -- [check input parameter given] -- [decide local/remote backup] -- [perform backup/rotate backup] -- [write log/give feedback]-- .This script can due incremental backup so if you have running the same backup before, system will save previous data backup and make a new copy of data backup, this important procedure can be use to implemented restore point.


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