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TABLE OF CONTENTS
Abstract
Contents
List of Acronyms
CHAPTER ONE
1 Introduction
1.1 Background
Information
1.2 Statement of
Problem
1.3 Objectives
1.4 Methodology
1.5 Outline of the
Thesis
CHAPTER TWO
2 Literature Review
2.1 Literature
Survey
2.2 Cryptography
Security
2.3 Secret Sharing
Scheme
2.3.1 Share
Distribution
2.3.2 Key
Reconstruction
2.4 Data-based
Access Control
2.5 Hash Function
2.5.1 Types of Hash
Function
2.6 Cryptography
Encryption
2.7 Symmetric Key
Cryptography
CHAPTER THREE
3 Design of the Work
3.1 Introduction
3.2 Modeling
3.3 Pro le
Structure
3.4 Algorithm
Selection
3.4.1 Hash Algorithm
3.4.2 Secret Key
Algorithm
3.5 Examples using
Indirect Access Control Method
CHAPTER FOUR
4 Implementation
5 Results and
Discussion
5.1 Introduction
5.2 Evaluation
5.2.1 Con dentiality
5.2.2 Scalability
5.2.3 Flexibility
CHAPTER SIX
6 Conclusions and
Recommendations
6.1 Conclusion
6.2 Recommendation
References
Appendix
Abstract
Social networking has become a popular way to be in contact with each
other. In social networking, people tend to share a wide range of information
with other users of the networking site. Here, security of personal information
has become a most critical issue. One of the important issues in online social
network is that how user privacy is protected because online social network providers
have full control over users' data. The online social network providers
typically store users' information permanently. Meanwhile, the trend in
information security is mov-ing the security perimeter as close to the data as
possible. We want to move the perimeter closer to the data, but do this without
being able to derive who is accessing which data. An e cient privacy protection
mechanism is important for online social networking sites that can be used to
protect the privacy of online users' data from third parties. An access control
mechanism shifts the control over data sharing back to the users by providing
them with exible and dynamic access policies. Hence, instead of relying on
credentials given by a person trying to access information, there is a need to
protect the data using only the data itself. In this context where decryption
of data is made possible by already knowing some part of the data. This thesis
work discusses the implementation of data based access control in social
networking sites. That is, personal information is made available only to those
who already have some of this information. We de ned and analyzed types of data
based access control methods (direct, indirect and order-invariant data based
access control methods). An e ort is made to design suitable policy in
order to apply them to social networking sites. We implemented our solution in
a prototype platform for social networking sites using a Java based prototype
and My Structured Query Language (MySQL) database. Our experimental re-sults
verify the e ectiveness of indirect data based access control method over
social networking sites. This mechanism provides enhanced security features
from both eavesdrop attacks and provider attacks. Moreover, we present a
performance study of the implemented prototype.
Chapter 1
Introduction
1.1
Background Information
A social networking website
is an online platform that allows users to create a public pro le and interact
with other users on the website. The rst social net-working site SixDegrees.com
was launched in 1997 [1]. Six Degrees allowed users to create pro les, list and
message their friends and traverse friend's listings, thus tting the de nition
above. Even though there were millions of users, users did not have many direct
friends and Six Degrees did not o er much functionality besides messaging. The
website nally shut down in 2000 [1]. During and after this period other
websites started adding Online Social Networks (OSN) features to their existing
content, essentially becoming OSNs, with various degrees of suc-cess. In the
years that followed, new OSNs started from scratch and began to o er
functionality beyond simply listing and browsing friends.
When registering to a
social network, the user will be given an account and a pro le, where he or she
is able to modify personal information, specify relation-ships with other users
and even manage personal resourses, such as comments and photos. So there is a
need to protect sensitive information from unauthorized people. The traditional
access control implemented in social networks is based on the relationship
between each user. A member from a social network can decide which personal
information is accessible by marking a given item as public or pri-vate.
Although this approach has the advantage of being easy to implement, lacks
exibility. The relationship settings do not allow users to specify their own
access control requirements, which might lead to a too loose or too restrictive
access control policy [2]. Moreover, social networks store information
remotely, rather than on a user's personal computer. This means the privacy
policy may change at any time without a user's permission. Due to this content
that was posted with restrictive privacy settings may become visible....
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