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In this paper we explore the notion of a secure kiosk, a trusted computing platform built using off-the-shelf components. We demonstrate how kiosks serve as convenient primitives when designing secure computing protocols, as they allow for a very prescribed set of assumptions to be made about a system. We begin by defining the necessary properties of a kiosk, and then explain how each of these properties...
Industrial control systems have become ubiquitous, enabling the remote, electronic control of physical equipment and sensors. Originally designed to operate on closed networks, the protocols used by these devices have no built-in security. However, despite this, an alarming number of systems are connected to the public Internet and an attacker who finds a device often can cause catastrophic damage...
Every day we entrust our privacy, safety, and security to police officers sworn to protect and serve. While many critical infrastructure computer systems have been well studied, the computer infrastructure supporting these officers remains to be surveyed in public literature. We remedy this by characterizing a sample police department's systems through a security lens, discussing weak points and areas...
China filters Internet traffic in and out of the country. In order to circumvent the firewall, it is helpful to know where the filtering occurs. In this work, we explore the AS-level topology of China’s network, and probe the firewall to find the locations of filtering devices. We find that even though most filtering occurs in border ASes, choke points also exist in many provincial networks. The result...
Once pervasive, the File Transfer Protocol (FTP) has been largely supplanted by HTTP, SCP, and BitTorrent for transferring data between hosts. Yet, in a comprehensive analysis of the FTP ecosystem as of 2015, we find that there are still more than 13~million FTP servers in the IPv4 address space, 1.1~million of which allow "anonymous" (public) access. These anonymous FTP servers leak sensitive...
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