THE "clean feed" filtering system Communications Minister Stephen
Conroy hopes will halt internet porn has already been defeated by
British researchers.
Richard Clayton, of the University of Cambridge's Computer Laboratory,
said the innovative blocking system CleanFeed, devised by British
internet service provider BT, could be circumvented in a number of
ways.
"At first sight, it's an effective and precise method of blocking
unacceptable content," Mr Clayton said. "But there are a number of
issues to address as soon as one assumes that content providers or
consumers might make serious attempts to get around it."
The report is more bad news for those hoping to block violence and
pornography from their internet. Although filter salesmen talk up
their wares, the reality has never quite matched the industry hype.
Former communications minister Helen Coonan moved away from insisting
internet service providers offer filtering after a 2006 NetAlert study
showed the filters were expensive, difficult to set up, frequently
inaccurate and drastically slowed the network performance.
Six filters were tested under optimised conditions, but the best
responder resulted in an
18 per cent reduction in relative performance, while the worst cut
performance by 78 per cent.
"The better-performing filters can process data at between 30-80Mbps
(millions of bits per second), which would still provide sufficient
performance for a small ISP," the report said.
"However, for larger ISPs with faster upstream connections, the use of
such filters would severely reduce their performance levels."
Instead, Senator Coonan opted for providing families with free filters
for home
computers. But a teenager immediately bypassed the NetAlert anti-porn
filter, simply by assuming his parents' profile on the home PC.
The Internet Industry Association has consistently warned of the
technical difficulties involved in introducing such filters on ISP
servers.
IIA chief executive Peter Coroneos said any clean feed policy would
have to be balanced against the likely financial and performance
costs.
Internet users would face slower access to websites, as every search
request would have to be checked against official blacklists. And
although there are millions of pornographic websites, the system would
only block those listed.
Telstra BigPond spokesman Craig Middleton said yesterday: "We stand
alongside the IIA and other ISPs in the view that PC-based filtering,
in the hands of a responsible parent, is the only workable solution."
Warren Cann, executive director of the Parenting Research Centre in
Melbourne, said that although filters offered some protection, parents
still needed to monitor their children's activities online.
Meanwhile, a 2007 survey of internet filtering in public libraries
found available filters were unreliable and inaccurate, often
preventing access to legitimate content while allowing undesirable
content through
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