475 research outputs found
Secure Middlebox-Assisted QUIC
While the evolution of the Internet was driven by the end-to-end model, it
has been challenged by many flavors of middleboxes over the decades. Yet, the
basic idea is still fundamental: reliability and security are usually realized
end-to-end, where the strong trend towards ubiquitous traffic protection
supports this notion. However, reasons to break up, or redefine the ends of,
end-to-end connections have always been put forward in order to improve
transport layer performance. Yet, the consolidation of the transport layer with
the end-to-end security model as introduced by QUIC protects most protocol
information from the network, thereby eliminating the ability to modify
protocol exchanges. In this paper, we enhance QUIC to selectively expose
information to intermediaries, thereby enabling endpoints to consciously insert
middleboxes into an end-to-end encrypted QUIC connection while preserving its
privacy, integrity, and authenticity. We evaluate our design in a distributed
Performance Enhancing Proxy environment over satellite networks, finding that
the performance improvements are dependent on the path and application layer
properties: the higher the round-trip time and loss, and the more data is
transferred over a connection, the higher the benefits of Secure
Middlebox-Assisted QUIC
Variational methods with coupled Gaussian functions for Bose-Einstein condensates with long-range interactions. II. Applications
Bose-Einstein condensates with an attractive 1/r interaction and with
dipole-dipole interaction are investigated in the framework of the Gaussian
variational ansatz introduced by S. Rau, J. Main, and G. Wunner [Phys. Rev. A,
submitted]. We demonstrate that the method of coupled Gaussian wave packets is
a full-fledged alternative to direct numerical solutions of the
Gross-Pitaevskii equation, or even superior in that coupled Gaussians are
capable of producing both, stable and unstable states of the Gross-Pitaevskii
equation, and thus of giving access to yet unexplored regions of the space of
solutions of the Gross-Pitaevskii equation. As an alternative to numerical
solutions of the Bogoliubov-de Gennes equations, the stability of the
stationary condensate wave functions is investigated by analyzing the stability
properties of the dynamical equations of motion for the Gaussian variational
parameters in the local vicinity of the stationary fixed points. For
blood-cell-shaped dipolar condensates it is shown that on the route to collapse
the condensate passes through a pitchfork bifurcation, where the ground state
itself turns unstable, before it finally vanishes in a tangent bifurcation.Comment: 14 pages, 14 figures, submitted to Phys. Rev. A, some equations
correcte
Vehicular Cooperative Maneuvers -- Quo Vaditis?
Vehicles will not only get more and more automated, but they will also
cooperate in new ways. Currently, human-driven vehicles begin to communicate
with each other using vehicle-to-everything technology. Future vehicles will
use communication to share sensor data and even negotiate cooperative
maneuvers. This lets them learn more about the environment and improves traffic
flow and passenger comfort as more predictable maneuvers are likely to lead to
a smoother ride. This paper introduces the most important concepts around
cooperative vehicular maneuvers. We also summarize currently open challenges
and questions to answer before a deployment can begin. Afterward, we give some
perspectives on the further evolution of cooperative maneuvers and beyond.Comment: 8 pages incl. references and author biographies, 4 figures incl.
multiple sub-figure
- …