System Routes Internet Traffic Around
Countries You Don't Trust
By Jeremy Hsu
Posted 24 Aug 2015
| 14:00 GMT from ieeespectrum.org
Whenever someone sends a website request or email, Internet data
packets
countries, such as China. A new system provides a way for
Internet users to route their data around specified “forbidden” countries
and gives proof of whether or not the routing succeeded, its inventors revealed
last week.
The Alibi Routing system relies on a peer-to-peer
network to relay data packets around specified forbidden countries on
their way to a final destination. In this case, the “peers” are other
Internet users running the Alibi Routing software. The system provides proof of
successful or unsuccessful routing by calculating whether a packet was at a
specific geographic location far enough away from the undesired countries so
that data could not have passed through.
"With recent events, such as censorship of Internet traffic,
suspicious 'boomerang routing' where data leaves a region only to come back
again, and monitoring of users' data, we became increasingly interested in this
notion of empowering users to have more control over what happens with their
data," said Dave Levin, an assistant research scientist in the Institute
for Advanced Computer Studies at the University of Maryland, in a press
release.
Levin and his colleagues presented their research last week
at the Association for Computing Machinery Special Interest Group on
Data Communication (ACM SIGCOMM) conference in London. They
developed the system with funding from the U.S. National Science Foundation,
the Office of Naval Research, and an Amazon Web Services in Education
grant.
Most Internet users typically don’t have much control over the
path their Internet data travels. That can prove problematic because routers in
certain parts of the world will modify data passing through and effectively
censor the content. In 2012, researchers showed that Domain Name System (DNS)
requests passing through China undergo the same risk of censorship as
similar requests coming from a Chinese resident.
The Alibi Routing software provides proof of the data’s path by
using measurements of round-trip times and the GPS coordinates of routers. Its
“alibi” system chooses relays far away enough from
user-specified forbidden zones that the data would undergo a noticeable
lag if it traveled through both the relay and the forbidden zone.
Researchers tested Alibi Routing with a simulated network of
20,000 participants. They also chose forbidden countries such as China,
Japan,, North Korea, Saudi Arabia, Syria, the United States and others.
Success in finding an “alibi” route depends in part on how central
the specified forbidden zones are to Internet routing. But the simulations
suggested the system could find a safe route more than 85 percent of the time.
The team hopes to publicly release Alibi Routing as an Internet browser plug-in
by the end of 2015.
Such a system could be immediately deployed without requiring
“public key infrastructure (PKI) or modifications to existing routing
protocols or switching hardware; it does not require synchronized clocks;
and it does not require access to any information about the underlying routing
topology of the Internet,” the researchers wrote in their conference paper.
All it needs is individual Internet users to use the software.
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