Πρωτόκολλα ανώνυμης επικοινωνίας : μελέτη περίπτωσης - το πρωτόκολλο BAR και επεκτάσεις του πρωτοκόλλου
Anonymous communication protocols : a case study of the BAR protocol and some extensions
Μανδαλενάκη, Μαρία - Ευφραιμία
KeywordsBAR ; Ανωνυμία αποστολέα ; Ανωνυμία παραλήπτη ; Μη συνδεσιμότητα ; DC-net ; Mix-net ; Πολυεκπομπή ; Επικοινωνία πραγματικού χρόνου ; Sender anonymity ; Receiver anonymity ; Unlinkability ; Broadcasting ; Real-time communications
Nowadays, Internet anonymity is an issue that has gained the attention of Internet users, since modern web technologies have strengthened users’ fears about the protection of their online identity. Several anonymous communication protocols have been proposed in the literature, which support various anonymity properties of online Internet users. The goal of this thesis is to analyze existing anonymous communication protocols. As a case study, the Broadcast Anonymous Routing protocol (BAR) is analyzed and several extensions are proposed. BAR is an anonymous communication protocol, a system that provides strong sender-anonymity, receiver-anonymity, as well as unlinkability. Furthermore, BAR does not allow a strong adversary, such as a global passive adversary, to verify whether some users are actually communicating at some time period. In particular, the main objective of this work was the development of all the sub-protocols defined in BAR, and the extension of its existing implementation, in order to provide a robust functionality of the system which scales well as the number of users increases. Moreover, a secondary objective of this thesis was the design of an application, which would serve the needs of the protocol and provide a graphical interface for the convenience of users. A key issue for such an application is data security. Thus, efforts have been made to ensure the data transmitted and user’s information, with the use of modern encoding techniques, which is a necessity to prevent unauthorized access.