First of all install dislocker, for doing that install aptitude and then

$sudo aptitude search dislocker

once you find dislocker install it, with:

$sudo apt-get install dislocker

once you have it installed, then you should run something similar to this:

$sudo fdisk -l

to discover your disk, and then

$sudo dislocker -u[YOUR_PASSWORD_GOES_HERE] /dev/sdb1 /mnt/hdext
$sudo mount /mnt/hdext/dislocker-file /mnt/hd


With the introduction of biometric studies into the computer science, the first devices and methodologies started to grow in such manner we can see fingerprints scanners in airports, voting machines in democratic countries and even in ATM’s (very common in Brazil). There are different methods to identify an information system user, including fingerprints and facial recognition, for instance.


One of the most popular methods of identifying an information systems user is by the facial recognition. As a user I have already used this technology to be identified by companies which required my facial recognition to emit educational certificates, I was requested to be identified by Coursera as stated by Vrankulj (2013) and Duolingo (n.d), and both companies applied the technology to identify me as the real student, what allowed the institution to emit the certificate with assurance that I was the student who was in class and doing the required tests.

This technology in the past was in the hands of a few companies, but today with my experience of developing such kind of systems, the facial recognition can be easily implemented using the OpenCV (Open Source Computer Vision) library OpenCV(n.d), which is available on an open source license, and with a few efforts can be achieved a fully functional facial recognition solution.


As mentioned in the topic above, one of the most effective ways of ensuring the identification of an internet user is by facial recognition biometry. On my viewpoint, this technology is becoming so trusted that the Australian border and immigration control has efforts on replacing the use of passports with facial recognition as stated by The Guardian (2017).

There are more studies on the way, which impacts the facial recognition technology with the use of alternative methods that goes beyond the technology we have today, with 3-d scanning to be implemented by Apple in the iPhone 8 as stated by The Fortune (2017), what in my viewpoint are efforts to minimize the possibility of the facial recognition system to be cracked (think about using a picture of someone instead of the real person at the moment of the recognition, what can be a controversy on the effectiveness of such technology).


If you think that by implementing a fingerprint scanner in an ATM, reduces a high possibility of fraud in the banking system since the bank card is not allowed to be used by another person. Not even considering all the ghost users that the banking system may possibly identify by the use of such technology.

In spite of bringing costs to the system, we live in a society today where all social classes may be possibly corrupted. Corruption in inserted in all kinds of social classes and people, especially thinking about the banking system, which is the source of the money transactions and may be the easiest way of detect corruption by the implementation of such technologies.

If you consider that to implement such a system there is a cost, the users which do not practice corrupt activities may have the impact of paying the price of that one who practices it, however when you think about society as a whole, most of the non corrupt users can be positively affected by the reduction of the frauds, since they can also be a victim.


Vrankulj (2013) Coursera looks to verify online student identity with photo, keystroke dynamics [ONLINE] Available at: (Accessed 17 September 2017).

Duolingo (n.d) Introducing Duolingo Language Certificates [ONLINE] Available at: (Accessed 17 September 2017).

OpenCV (n.d) Face Recognition with OpenCV [ONLINE] Available at: (Accessed 17 September 2017).

The Guardian (2017) Facial recognition to replace passports in security overhaul at Australian airports [ONLINE] Available at: (Accessed 17 September 2017).

Fortune (2017) Apple Is Reportedly Testing 3D Facial Scans to Unlock iPhones [ONLINE] Available at: (Accessed 17 September 2017).

Since the early years in computing, Operating Systems were used in computers to make an interface between the human user and the computer machine. OS or Operating System can be defined by “operating system is the software that controls the overall operation of a computer” (Glenn Brookshear, J, 2011).

Nowadays, users have plenty of options to choose as its operating systems, there are Operating Systems for final users, small business, medium and large business, mobile, server/networks, and so many others.

Operating Systems have some characteristics to be compared, in this paper will be covered: Usage (Desktop, Server?), Ease of Use (Graphical, Non-Graphical) and Costs.

            The most popular operating systems for desktop final-users nowadays are:

  • Microsoft Windows;
  • Apple Mac OS;
  • Linux.

For mobile most users use:

  • Apple iOS;
  • Google Android;
  • Windows Mobile.

And Server/Network Computers:

  • Linux;
  • FreeBSD/OpenBSD/NetBSD;
  • Oracle Solaris;
  • Windows Server;

To have a better understanding of OSs it is necessary to know a little bit about history. Most of them are based on the Unix Operating System, which is: Apple Mac OS, Oracle Solaris and Linux (including Google Android and Apple iOS). The UNIX Operating System was created in 1969 by system engineers at AT&T’s Bell Labs (Unix Help, 2014), and since nowadays it continues to be very influencing for the modern Operating Systems. Linux, in the beginning, was more focused in the server business, with a small slice of the market for final-users, but nowadays it became more popular with the effort of open-source collaborators and investing companies. Microsoft Windows, which is the most popular OS worldwide, was completely developed by Microsoft Corporation, not following the Unix OS concepts.

The ease of use is a very important topic to be pointed. Microsoft Windows became the most popular OS in the world because it has been always oriented by the GUI system, nevertheless, Mac OS is as simple as Windows, but it wasn’t much popular because of the Apple’s business strategy to sell their own built computers.

The table bellows points, the big difference between prices for Operating Systems.

Operating System Price
Windows 8.1 (Amazon, 2014) $95.91
Mac OS X version 10.6.3 Snow Leopard (Amazon, 2014) $29.38
Ubuntu Linux (Amazon, 2014) $10.99 (free to download)

While Apple OSX is cheaper than Microsoft Windows, you must consider that Apple sells its machines, and you can use only with Apple computers, on the other hand, Microsoft only sells operating systems but It can be used in any PC based computer. Ubuntu is totally free for download, but if you want to have the original DVD you can buy for a very cheap price at Amazon.

I personally used almost all the covered Operating Systems in this paper. I became a Linux enthusiast in 1999, using Caldera Open Linux and afterward used Slackware, Debian, Mandrake, Conectiva, RedHat, and others; I tested also NetBSD and OpenBSD OSs; I used Microsoft Windows since the Windows-95 version (going through Windows-98, Windows ME, Windows 2000, Windows XP, Windows Vista and Windows 7) and since 2012 I am a Mac OS user. My cell phone is an Android 4 operating system, which I really like to use.


Glenn Brookshear, J, 2011. Computer Science: An Overview. 11th ed. United States of America: Addison-Wesley.

UNIXhelp. 2014. History of the UNIX operating system. [ONLINE] Available at: [Accessed 30 July 14].

Amazon. 2014. Windows 8.1 System Builder OEM DVD 64-Bit. [ONLINE] Available at: [Accessed 30 July 14].

Amazon. 2014. Mac OS X version 10.6.3 Snow Leopard. [ONLINE] Available at: [Accessed 30 July 14].

Amazon. 2014. Ubuntu Linux 13.04 Special Edition DVD. [ONLINE] Available at: [Accessed 30 July 14].