Yasaman Daghighi - Faculty of Mathematical and Computer Sciences,Shahid Chamran University of AhvazAhvaz, Iran, ۶۱۳۵۷۸۳۱۵۱
Hamed Fahimi - Assistant professorFaculty of Mathematical and Computer Sciences,Shahid Chamran University of Ahvaz,Ahvaz, Iran, ۶۱۳۵۷۸۳۱۵۱

Bypassing internet filtering simply stands forcircumventing internet censorship. A variety of softwares,techniques and methods with different ease of use, speed, securityand risks for this purpose have been developed in recent decades.In this context, often VPN is used to connect to a remotecomputer or network in another area, city or country and sendinformation in a fully secure and encrypted manner. This paperis a survey on several famous filter breakers in order to analyzeeach one separately and make a comparison. We will introducethe types of protocols used in this context and discuss each oneseparately, and we will opt for the best protocol for VPNaccording to the capabilities and features of each and the level ofuser expectations

security, filtering, VPN, protocol