NSA, Pentagon, police fund research into steganography detection
Declan McCullagh
lists at politechbot.com
Tue Feb 20 08:13:23 PST 2001
http://www.wired.com/news/politics/0,1283,41861,00.html
Secret Messages Come in .Wavs
by Declan McCullagh (declan at wired.com)
2:00 a.m. Feb. 20, 2001 PST
FAIRFAX, Virginia -- Neil Johnson has a job that's nothing if not
unusual: He investigates how to uncover concealed messages embedded in
sound and video files.
A researcher at Virginia's George Mason University, Johnson is one of
a small but growing number of digital detectives working in the field
of computer steganalysis -- the science of detecting hidden
communications.
"I analyze stego tools," said the 32-year-old security specialist who
is the associate director of GMU's Center for Secure Information
Systems. "I try to find out what can be detected or disabled. I see
what their limitations are."
The tools he's talking about include programs such as Steghide, which
can embed a message in .bmp, .wav and .au files; and Hide and Seek,
which works with .gif images.
Most computer-based steganography tools have one thing in common: They
conceal information in digitized information -- typically audio, video
or still image files -- in a way that prevents a casual observer from
learning that anything unusual is taking place.
The surprising news, according to Johnson and other researchers:
Current stego programs don't work well at all. Nearly all leave behind
fingerprints that tip off a careful observer that something unusual is
going on.
Johnson's work on steganalysis may seem obscure, but it has important
law enforcement and military applications. The National Security
Agency and police agencies have underwritten his research -- his
center's graduate program at GMU is even certified by the NSA.
The Pentagon funds related research at other institutions, and the
Naval Research Laboratory is helping to organize the fourth annual
Information Hiding Workshop in Pittsburgh from April 25 to 27.
Earlier this month, news reports said U.S. officials were worried that
operatives of accused terrorist Osama bin Laden now use steganographic
applications to pass messages through sports chat rooms, sexually
explicit bulletin boards and other sites. That complicates the NSA's
mission of "sigint," or signals intelligence, which relies on
intercepting communications traffic.
[...]
WetStone's "Steganography Detection and Recovery Toolkit" is being
developed for the Air Force Research Laboratory in Rome, New York. The
project overview, according to the company, is "to develop a set of
statistical tests capable of detecting secret messages in computer
files and electronic transmissions, as well as attempting to identify
the underlying steganographic method. An important part of the
research is the development of blind steganography detection methods
for algorithms."
Gordon said the effort arose from a study the Air Force commissioned
from WetStone on forensic information warfare in 1998. The company was
asked to identify technologies that the Air Force needed to guard
against and it highlighted steganography as one of them.
In addition to the NSA and the eavesdrop establishment, military
installations, government agencies, and private employers could be
affected by steganography. An employee or contractor could send
sensitive information via e-mail that, if hidden, would not arouse
suspicion.
[...]
-Declan
http://www.mccullagh.org/
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