4,715 research outputs found
Modeling and Testing Implementations of Protocols with Complex Messages
This paper presents a new language called APSL for formally describing
protocols to facilitate automated testing. Many real world communication
protocols exchange messages whose structures are not trivial, e.g. they may
consist of multiple and nested fields, some could be optional, and some may
have values that depend on other fields. To properly test implementations of
such a protocol, it is not sufficient to only explore different orders of
sending and receiving messages. We also need to investigate if the
implementation indeed produces correctly formatted messages, and if it responds
correctly when it receives different variations of every message type. APSL's
main contribution is its sublanguage that is expressive enough to describe
complex message formats, both text-based and binary. As an example, this paper
also presents a case study where APSL is used to model and test a subset of
Courier IMAP email server
Mobile IP: state of the art report
Due to roaming, a mobile device may change its network attachment each time it moves to a new link. This might cause a disruption for the Internet data packets that have to reach the mobile node. Mobile IP is a protocol, developed by the Mobile IP Internet Engineering Task Force (IETF) working group, that is able to inform the network about this change in network attachment such that the Internet data packets will be delivered in a seamless way to the new point of attachment. This document presents current developments and research activities in the Mobile IP area
MagicPairing: Apple's Take on Securing Bluetooth Peripherals
Device pairing in large Internet of Things (IoT) deployments is a challenge
for device manufacturers and users. Bluetooth offers a comparably smooth trust
on first use pairing experience. Bluetooth, though, is well-known for security
flaws in the pairing process. In this paper, we analyze how Apple improves the
security of Bluetooth pairing while still maintaining its usability and
specification compliance. The proprietary protocol that resides on top of
Bluetooth is called MagicPairing. It enables the user to pair a device once
with Apple's ecosystem and then seamlessly use it with all their other Apple
devices. We analyze both, the security properties provided by this protocol, as
well as its implementations. In general, MagicPairing could be adapted by other
IoT vendors to improve Bluetooth security. Even though the overall protocol is
well-designed, we identified multiple vulnerabilities within Apple's
implementations with over-the-air and in-process fuzzing
GridFTP: Protocol Extensions to FTP for the Grid
GridFTP: Protocol Extensions to FTP for the Gri
Technology Corner: Analysing E-Mail Headers for Forensic Investigation
Electronic Mail (E-Mail), which is one of the most widely used applications of Internet, has become a global communication infrastructure service. However, security loopholes in it enable cybercriminals to misuse it by forging its headers or by sending it anonymously for illegitimate purposes, leading to e-mail forgeries. E-mail messages include transit handling envelope and trace information in the form of structured fields which are not stripped after messages are delivered, leaving a detailed record of e-mail transactions. A detailed header analysis can be used to map the networks traversed by messages, including information on the messaging software and patching policies of clients and gateways, etc. Cyber forensic e-mail analysis is employed to collect credible evidence to bring criminals to justice. This paper projects the need for e-mail forensic investigation and lists various methods and tools used for its realization. A detailed header analysis of a multiple tactic spoofed e-mail message is carried out in this paper. It also discusses various possibilities for detection of spoofed headers and identification of its originator. Further, difficulties that may be faced by investigators during forensic investigation of an e-mail message have been discussed along with their possible solutions
KeyForge: Mitigating Email Breaches with Forward-Forgeable Signatures
Email breaches are commonplace, and they expose a wealth of personal,
business, and political data that may have devastating consequences. The
current email system allows any attacker who gains access to your email to
prove the authenticity of the stolen messages to third parties -- a property
arising from a necessary anti-spam / anti-spoofing protocol called DKIM. This
exacerbates the problem of email breaches by greatly increasing the potential
for attackers to damage the users' reputation, blackmail them, or sell the
stolen information to third parties.
In this paper, we introduce "non-attributable email", which guarantees that a
wide class of adversaries are unable to convince any third party of the
authenticity of stolen emails. We formally define non-attributability, and
present two practical system proposals -- KeyForge and TimeForge -- that
provably achieve non-attributability while maintaining the important protection
against spam and spoofing that is currently provided by DKIM. Moreover, we
implement KeyForge and demonstrate that that scheme is practical, achieving
competitive verification and signing speed while also requiring 42% less
bandwidth per email than RSA2048
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