Ασφάλεια στα ασύρματα τοπικά δίκτυα (WPA/WPA2)

Κεφαλάς, Γρηγόριος Ι.

Master Thesis

Author

Κεφαλάς, Γρηγόριος Ι.

Date

2012-09-28

Abstract

The purpose of this thesis is to describe the way wireless networks work, as well as their encryption protocols and security violation. More precisely, all active wireless networks within regions of Athens will be searched for and registered through the use of specific functions and applications. By creating an xml parser data will be processed, a dictionary attack will be created and finally the security of an encrypted WPA/WPA2 wireless network will be violated. More specifically, chapter one describes the human need for remote communication, the definition, the architecture, the categories that wireless networks are divided into and the differences between wireless and wired networking. Chapter two describes the advantages and disadvantages in using wireless networks, analyzes wireless devices being used and describes wireless networking standards. Moreover, it gives the analysis of publications and architecture of the standard 802.11. Chapter three refers to the types of encryption algorithms, describes and compares in detail the encryption protocols WEP and WPA/WPA2 and analyzes two types of attacks. Chapter four describes the violation of wireless security. It presents in detail the tools used for searching, registrating and violating wireless networks. The analysis of the xml file presents statistical information about cryptographic methods and the channels in use. Additionally, based on the statistics, the most common wireless network ssid and cryptographic methods primarily used are found. Finally, the effects of the attacks will be compared and the results will be analyzed in detail.