Securing Mobile Cloud Using Finger Print Authentication

International Journal of Network Security & Its Applications (IJNSA), Vol.5, No.6, November 2013
DOI : 10.5121/ijnsa.2013.5604 41
Securing Mobile Cloud Using Finger Print
Authentication
IehabALRassan, HananAlShaher
Department of Computer Science,King Saud University,Riyadh, Saudi Arabia
ABSTRACT
Mobile cloud computing becomes part of mobile users daily life transactions. Mobile devices with Internet
capabilities have increased the use of mobile clouding computing. Due to hardware limitations in mobile
devices, these devices can't install and run applications require heavy CPU processing or extensive
memory. Cloud computing allows mobile users to synchronize their data with remote storage and utilize
applications require heavy CPU processing or extensive memory such as Microsoft Office or Adobe
Photoshop, as they run in a desktop computer.
The combination of cloud computing and mobile computing introduces mobile cloud computing, which also
present new issues of security threats such as unauthorized access to resources exist in mobile cloud.
Protecting mobile cloud computing from illegitimate access becomes an important concern to mobile users.
This paper proposes and implements a new user authentication mechanism of mobile cloud computing
using fingerprint recognition system. Fingerprint images of mobile users can be captured and processed
using mobile phone camera to access mobile cloud computing . The implementation of the proposed
solution in different mobile operating systems and devices show security enhancement in mobile cloud
computing with accepted performance level.
KEYWORDS
Mobile cloud computing, Wireless Network, Mobile Network, Mobile devices, Cloud computing, Finger
print authentication
1. INTRODUCTION
The ability to access data and applications from anywhere and at any time with low cost arethe
most important benefits of mobile cloud computing. The primary security issue on mobile cloud
computing is protecting remote data and applications from illegitimate access. While authorized
users can access the data, the cloud provider can also do so. There is also the possibility of
unauthorized access, which is access by third parties such as hackers. Therefore, the security issue
in mobile cloud computing becomes one of the top areas for research [1, 2]. In tradition, cloud
computingusers can avoid the security risk by just encrypting the data before it is sent and stored
in the cloud. However, this is not the case with the mobile users, because encryption technology
is not suitable for mobile devices due to the encryption process, which requires high workload
and high CPU processing[2].In this paper a new mechanism is proposed and implemented to
authenticatemobile cloud computing by using fingerprint recognition as part of the security
solution. Improving the mechanism of protecting access to the mobile cloud leads to improving
the security overall, which at least protects the mobile cloud from unauthorized access. This
section starts with an introduction to mobile cloud computing and describes the concept of mobile
cloud computing. The rest of the paper is organized as follows: section2 provides a literature
review about security solutions on mobile cloud. In section3 and 4 respectively, present the
proposed approach as design and experimental results. At the end, conclusion is given in section5.

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1.1. The Mobile Revolution
Portability is an added value to computer devices that almost everyone looks for, either at work or
at home, along with the preservation of processing power and local data storage. That is
illustrated by the growing number of laptops users rather than PCs users and that's why the
functionality of mobile phone has been changed.
Initially, the basic function of mobile phoneswasto make conversation calls. Nowadays,this
becomes a trivial function sincemost of mobile usersneed to browse the Internet and do their
online transactions while they are in the move. Thus, the form and the function of mobile phones
have been changed. Indeed, functionality of the mobile phone closely resembles that of a personal
computer; therefore,people cannot ignore the mobile world and the daily impact of transactional
activity of mobile technology. This appears obviously in the increasing of number of users of
mobile phones, which provide Internet access and built-in computing applications [3, 4, 5].
Mobile users can eliminate some of the constraints of the traditional computing environment,
such as power, space, cost, and time, by combining pre-existing technologies to create an
environment and call it cloud computing. Also, if we can make the core technology in new
environment, we can create virtualization to allow more flexibility, in which the same physical
resources are shared virtually with multi OS. As a result, we well take the advance in processors
and storage, reducing the cost of service and increasing the speed. This adds new value that any
company is looking for in services. And that leads to say the cloud is a more compelling solution
and the evolution of the Internet in the near future will be toward cloud computing [6, 7, 4].
Accessing the Internet through mobile devices has become an everyday event for most of mobile
users, and these devices allow users to synchronize data from or to their PCs. However, due to
hardware limitations, these devices can't install and run software such as Microsoft Office or
Adobe Photoshop. As an alternative, cloud computing allows users to overcome these limitations
and becomes the future of mobile computing [3].
Indeed, accessing the cloud with a mobile device has created a new concept called mobile cloud
computing (MCC). Data will be available not only at home or at the office, but it can easily be
accessed from the cloud with a mobile device and manage your data from anywhere. Mobile
devices take data out of homes and offices and put them in our pockets [3].
If clients of mobile cloud computing have an Internet connection, they can accomplish their work
simply. Anyway, with all of the advantages provided by mobile cloud computing, security still
remains an important issue [5].
2. LITERATURE REVIEW
In the cloud computing environment, users use an authentication system to utilize the cloud
servicesthrough a Web-based user interface, either a web browser or a mobile application, or a
web service application programming interface (API). Authentication on the cloud is necessary to
provide secure access to the cloud services by authorized users only. At present, authentication is
done in different methods, such as a simple text password [12].
In the next subsections, a review of some existing authentication systems, which are based on
client-server architecture. These existing authentication systems are provided by cloud computing
providers, third-party providers, and as literature.

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2.1 Literature
There are several proposed strong user authentication provided by researchers to improve mobile
cloud security. Omri et al. in [5] introduced an application that uses handwriting recognition as an
authentication system to secure access in mobile cloud. In this way, the user is identified by
password and unique handwriting style. This application, which used the mobile phone as a
biometric-capture device, also used Hadoop (Apache Hadoop is an open-source software that
provides applications both reliability and data motion) to establish the connection between
mobile user and the cloud via Internet. It has been implemented into two ways. The main
difference is in the implementation mode, one as web page and the other as mobile application.
In [13], suggested using quick response code (QR code) for a user authentication system in the
mobile cloud. In this system, the user ID, password, and the user's image are converted into QR
code. In the multilevel authentication system proposed in [12], this authentication system
generates and authenticates the password at multiple levels to access the cloud services. Access to
the cloud is allowed if authentication is successful in all levels.
• First level of authentication is the organization level. This level reads the organization
password; if unauthenticated they are going to terminate. If it is authenticated, then it enters a
second-level authentication.
• Second level of authentication is the team level. This level reads the team password; once
authentication is done, it then enters a user-level authentication.
• Last level is the user level. This level reads the user password to provide the user privileges
and permission.
In [11], a strong user authentication system was proposed for cloud computing; this system
verifies user authenticity via password, smartcard, and out of band authentication. In 2011, Chen,
et al. [10] proposed an extension of Yang and Chang [14]. Chen adds a password protection-
based mechanism with dynamic ID to provide authentication to ensure user legality.
As seen in this section, there are a few proposed systems in the literature for mobile cloud, but for
regular cloud there are many proposed schemes that are good for improving security in regular
cloud, but in the mobile cloud it's so hard for users because of its lack of usability.
The balance between security and usability must be found [9], just as when trying to apply the
authentication system from a traditional client server to cloud computing. It can be applied, but it
has a high risk because the infrastructure in the cloud is shared among users and managed by the
cloud providers.
2.2.Cloud computing providers
Cloud providers are divided into three parts, depending on the type of the service provided:
1.Software as a Service (SaaS)—the users can access an application remotely via the Internet.
2.Platform as a Service (PaaS)—users can create an application to meet their needs and then
deploy it on the cloud.
3.Infrastructure as a Service (IaaS)—users can rent servers, networking components, hardware,
and storage.
Indeed, when reviewing most cloud providers, perhaps all- have the same authentication system
based on user ID or email and password, whether the service provided is critical or not.

44
2.3. Third Party
Some companies prepare authentication systems as a service to access the cloud. Any services
provided by companies other than the cloud provider are called third-party providers. Recently,
many of mobile device fingerprint hardware solutions are provided by companies such as Grabba,
S.I.C. Biometrics, and Fulcrum biometrics. Other companies provide software with strong
authentication system using input either from external hardware or from the software itself. Also,
there are many companies providing solutions such as web services and software development
kits (SDK) for developers to create and integrate an authentication system to help the end users.
But in this research we focus on products forwarded to the end users as a ready product to use.
As seen in the literature review, the lack of existing mobile user authentication systems is the
main motivation to improve the mobile cloud security through strengthen the authentication
system.
2.4. Related works
A few researchers have studied how to extract a fingerprint image from digital camera. [15, 16]
have shown that is possible to extract a fingerprint by using a low-cost webcam when applying
different preprocessing and image enhancements approaches. [17] suggested a preprocessing
approach for fingerprint recognition.
In [18], they present fingerprint image preprocessing approaches based on a whole-hand image
captured by digital camera. This method starts with locating a key point location from the hand
contour image. Then the middle finger is segmented from the hand image to extract fingerprint
from it.
In [19], they used a monochrome digital camera and, to reduce the noise in the fingerprint image,
they used a low-pass filter, then feature extraction is based on block mean value and block
coherence analysis. In [20], they use a strong view difference image rejection method to convert
the 3D to a 2D image, and then use the core point detection algorithm to obtain the minutiae
points.
Feature extraction based on region growing method, frequency information and color distribution
information is used in [21], and then, to do orientation estimation, they apply the iterative robust
regression method.
In [22], the segmentation is done by skin color detection and then enhanced by using the short-
time Fourier transform analysis; after that the core point is detected.

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Fig.1. The Proposed Design Soltion
3.THE DESIGNED APPROACH
In this section, the proposed authentication mechanism using fingerprint recognition to secure
access in mobile cloud is explained. Recently, there have a few works about using a digital
camera or a webcam as a sensor, but in literature only. Embedding a special fingerprint sensor or
adding external hardware as a fingerprint reader will be costly and will influence the mobile
simplicity. Utilizing the existing camera in a mobile phone to capture fingerprint images as a
biometric sensor is inexpensive to implement. The proposed solution is using a fingerprint
recognition system to obtain the fingertip image through the mobile phone camera.
The aim is to convert fingertip image obtained by mobile phone camera to fingerprint image and
extract ridge structure from it to be as similar as possible with the ridge structure gained from
fingerprint sensor. Of course, mobile camera can't convert the image to be like the output image
obtained and processed by using fingerprint sensor, but at least this process aim to export an
acceptable output. Figure 1 shows the proposed design soltion and how it works.
Save or store fingerprint image on mobile device is not requirement, due each time user want
access the cloud capture a new fingerprint image and login, as simple as. The whole approach was
hosted on cloud to take all benefit from it (all processes and storage was there). As a developer
account on a cloud provider has all privileges to create and maintain customize database as well
as their applications. The database provided with Platform as a Service (PaaS) from cloud
provider.

46
3.1.The proposed algorithm
Initially, in the enrollment phase the user presents the fingertip to the mobile phone camera to
obtain a fingerprint sample and extracted features by pre-processing the sample. Then, it is stored
in a database for comparison to verify the identity of the user. After take a fingerprint image as
input on login form, preprocessing image function working to extract features then matching
function start to match between these features with features were stored in database. If matching
succeeded, then user accepted otherwise user rejected. The similarity score (S) is the result of the
comparison between the extracted features and features stored in a database.
If (S is low value) then
Little similarity
If (S is high value) then
High similarity
After that, the decision will be based on the similarity score (S), which is compared to a
predefined threshold (T).
If (S > T) then
The user is accepted
Else if (S < T)
The user is rejected [23].
4.EXPERIMENTAL RESULTS AND DISCUSSION
The tests were separated into two parts:
• Functionality
• Performance
4.1 Evaluation Functionality
This section evaluates each function in the pre-processing class. All functions (convert to gray-
scale, filtering, etc.) gave positive test results. Figure 2 summarizes the output from various
functions, including (a) the original image, (b) convert to gray-scale, (c) edge enhancement, (d)
filtering, (e) binarization, (f) thinning, (g) map direction, and (h) minutiae extraction.

47
Figure 2: Functions - Output for Galaxy Note
4.2.Evaluation Performance
In this section, the process time is calculated for each function to test if the performance rate is
acceptable according to the rates established by the National Institute of Standards and
Technology (NIST). Figures 3,4 and5show the process time from testing the fingerprint images
for the Sony Xperia S and the Samsung Galaxy S3 devices.
4.3.Conclusions from the test results
From the results presented, the following conclusions can be noticed:
- The proposed solution is not only to secure unauthorized access, but also to protect databases
from injection attacks due to the absence of string input from users. The fingerprint image is
the only input from the user in accordance with the interface design. No other input is
permitted from the user to enter the system.
- The interface in this solution is based on HTML5, which is a cross-platform and has been
tested on different mobile platforms.
- With the addition of some filters to segment the method in this solution, it will be able to
work with web cameras.
- When work on fingerprint images as parabolic curves (parabola), it is easy to extract a static
and accurate center point.
- Different company mobile devices that's mean different quality, resolution and size of
images. In testing take this in account to prove the proposed solution should work successful
with it.
Figure 3 shows the experiment results of the fingerprint image taken with the Sony Xperia S
device, which recorded 0.9 seconds as the maximum time and 0.4 seconds as the average.
Figure 4 illustrates the process time for an image taken with a Samsung Galaxy S3 device; the
maximum time is 2.4 seconds and the average is 0.5 seconds.

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Another example is the BlackBerry Z in Figure 5, with approximately 4 seconds as a maximum
time and 0.8 seconds as the average recorded time.
Figure 3: Time process for Sony Xperia S images
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Figure 4: Time process for Samsung Galaxy S3
Figure 5: Time process for BlackBerry Z
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4.4 Discussion
The fingerprint images used in testing have a resolution of 72 dots per inch (dpi) which is less
than fingerprint images resolution (300 dpi) that captured from fingerprint sensors. From the
experiment results, it is evident that the range for the total processing time to pre-process a
fingerprint image takes between 1 and 12 seconds. Table 1 summarizes the range of process
times for each function in the pre-processing class. An acceptable enrollment time should be
equal to or less than two minutes, which means that the enrollment process must be
completed in 120 seconds. When the total process time is subtracted from the acceptable
enrollment time, there are 108 seconds remaining for enrollment. Figures 6 and 7 show the
enrollment process times in the proposed approach and how the proposed approach achieved
acceptable rates.
Table 1: Summary of Process Time
Function Range of time
process
Average
time
Convert to Gray 0.1 - 1 0.6s
Edge Enhancement 0.1 – 1.2 0.5s
Filtering 0.1 - 1 0.4s
Binarization 0.1 – 0.9 0.3s
Thinning 0.1 – 1.4 0.4s
Direction 0.1 – 0.9 0.2s
Extracted 0.1 – 1 0.5s
Total Time process 0.7 – 11.9 1.9s
Figure 6 shows the process time of enrolment for six different mobile devices, and nearly all
are very similar. In addition, Figure 7 illustrates that 0.2 seconds is the minimum time, 19
seconds is the maximum, and 0.4 seconds is the average. This means that the proposed
approach achieved 19 seconds, with 108 seconds being the maximum acceptable time.

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Figure 6: The time of Enrollment Process
Figure7: Enrollment Process Time
Creating a reference of the fingerprint images has an impact on matching results. The matching
results will be more reliable if an accurate and static reference is created. This study found that by
working with fingerprint images as parabolic curves, a static center point is obtained. This is in
contrast to extracting a core point by using different algorithms. Further, the matching process
1
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Galaxy S 00:06.0
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Galaxy S3 00:03.3
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Galaxy Note 00:00.6
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Nokia 920 00:03.9
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Sony 00:19.3
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EnrollmentProcessTime
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1
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10
Galaxy S
Galaxy S3
Galaxy Note
Nokia 920
Sony
Ipad 3

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time is shown in Figure 8 for three mobile devices. The average time is 0.4 seconds, which is an
accepted rate.
Figure 8: Matching Process Time
5. CONCLUSION
The combination of the cloud computing and mobile computing creates mobile cloud computing
and also introduce security threats such as unauthorized users access. The focus in this researchis
on the mobile cloud and protecting mobile cloud resources from illegitimate access. Biometric
recognition will be used in the near future in mobile devices. The proposed solution for
authenticating mobile cloud users using the existing mobile device camera as a fingerprint sensor
to obtain a fingerprint image, and then process it and recognize it. Results show that the proposed
solution has added value to keep performance at an accepted level.
For future work, accessing log file will be used to help identifying unauthorized attempts to
access data by third parties–the cloud provider or any intruders. Based on these logs, cloud
security policies will be modified and re-configured.
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Galaxy S 00:00.2
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00:00.8
00:00.5
00:00.2
00:00.7
00:00.2
00:00.1
00:00.7
00:00.3
Galaxy S3 00:00.5
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00:00.1
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00:00.2
00:00.1
00:00.2
00:00.8
00:00.6
00:00.6
Nokia 920 00:00.5
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00:00.6
00:00.3
00:00.1
00:00.4
00:00.6
00:00.7
00:00.7
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