群組式數據交換技術研究

[[abstract]]近年科技蓬勃發展，在通話與訊息傳遞方面，電話與簡訊已慢慢地被相關的行動終端設備的APP所取代，隨著網路功能的智慧型手機普及，遂可將救難系統架構在智慧型手機上。 本研究為了改善傳統救難隊通訊使用的手持無線電對講機之缺點，例如重量、體積龐大、天線容易折損…等問題，建立了一套救難用的APP，採用Android系統作為作業系統，建立一個WiFi-SoftAP的網路架構，使的救難人員和受困人員透過手機內應用程式進行交流，並在黃金時間內進行搶救。[[sponsorship]]臺南大學[[conferencetype]]國際[[conferencedate]]20131115~20131116[[iscallforpapers]]Y[[conferencelocation]]台南, 臺

DENIAL OF CONVENIENCE ATTACK TO SMARTPHONES USING A FAKE WI-FI ACCESS POINT

In this paper, we consider a novel denial of service attack targeted at popular smartphone operating systems. This type of attack, which we call a Denial of Convenience (DoC) attack, prevents non-technical savvy victims from utilizing data services by exploiting the connectivity management protocol of smartphones ’ operating systems when encountered with a Wi-Fi access point. By setting up a fake Wi-Fi access point without Internet access (using simple devices such as a laptop), an adversary can prompt a smartphone with enabled Wi-Fi features to automatically terminate a valid mobile broadband connection and connect to this fake Wi-Fi access point. This, as a result, prevents the targeted smartphone from having any type of Internet connection unless the victim is capable of diagnosing the problem and disabling the Wi-Fi features manually. For the majority of smartphone users that have little networking knowledge, this can be a challenging task. We demonstrate that most current smartphones, including iPhone and Android phones, are vulnerable to this DoC attack. To address this attack, we propose implementing a novel Internetaccess validation protocol to validate a Wi-Fi access point by taking advantage of the cellular network channel. It first uses the cellular network to send a secret to an Internet validation server, and tries to retrieve this secret via the newly established Wi-Fi channel to validate the connection of the Wi-Fi channel. ii ACKNOWLEDGEMENTS I would like to acknowledge my advisor Dr. Cliff Zou for all his support. I would als

Denial of Convenience Attack to Smartphones Using a Fake Wi-Fi Access Point

Abstract—In this paper, we present a novel denial-of-service attack targeted at popular smartphones that are used by normal users who are not technology savvy. This type of attack, which we call a denial-of-convenience attack, prevents non-technical savvy victims from utilizing data services by exploiting the connectivity management protocol of smartphones when encountered with a Wi-Fi access point. By setting up a fake Wi-Fi access point without Internet access (using a simple device such as a laptop computer), an attacker can prompt a smartphone with enabled Wi-Fi features to automatically terminate a valid mobile broadband connection and connect to this fake Wi-Fi access point. This, as a result, prevents the targeted smartphone from having any type of Internet connection unless the victim is capable of identifying the attack and manually disabling the Wi-Fi features. We demonstrate that most popular smartphones