Martha Liliana Ramirez, who lives in Miami, said she had not thought much about securing her $100-a-month Internet connection until recently. Last August, Ms. Ramirez, 31, a real estate agent, discovered a man camped outside her condominium with a laptop pointed at her building.
When Ms. Ramirez asked the man what he was doing, he said he was stealing a wireless Internet connection because he did not have one at home. She was amused but later had an unsettling thought: "Oh my God. He could be stealing my signal."
Yet some six months later, Ms. Ramirez still has not secured her network.
Beth Freeman, who lives in Chicago, has her own Internet access, but it is not wireless. Mostly for the convenience of using the Internet anywhere in her apartment, Ms. Freeman, 58, said that for the last six months she has been using a wireless network a friend showed her how to tap into.
"I feel sort of bad about it, but I do it anyway," Ms. Freeman said her of Internet indiscretions. "It just seems harmless."
And if she ever gets caught?
"I'm a grandmother," Ms. Freeman said. "They're not going to yell at an old lady. I'll just play the dumb card."
David Cole, director of product management for Symantec Security Response, a unit of Symantec, a maker of computer security software, said consumers should understand that an open wireless network invites greater vulnerabilities than just a stampede of "freeloading neighbors."
He said savvy users could piggyback into unprotected computers to peer into files containing sensitive financial and personal information, release malicious viruses and worms that could do irreparable damage, or use the computer as a launching pad for identity theft or the uploading and downloading of child pornography.
"The best case is that you end up giving a neighbor a free ride," Mr. Cole said. "The worst case is that someone can destroy your computer, take your files and do some really nefarious things with your network that gets you dragged into court."
Mr. Cole said Symantec and other companies had created software that could not only lock out most network intruders but also protect computers and their content if an intruder managed to gain access.
Some users say they have protected their computers but have decided to keep their networks open as a passive protest of what they consider the exorbitant cost of Internet access.
"I'm sticking it to the man," said Elaine Ball, an Internet subscriber who lives in Chicago. She complained that she paid $65 a month for Internet access until she recently switched to a $20-a-month promotion plan that would go up to $45 a month after the first three months.
"I open up my network, leave it wide open for anyone to jump on," Ms. Ball said.
For the Brodeurs in Los Angeles, a close reading of their network's manual helped them to finally encrypt their network. The Brodeurs told their neighbors that the network belonged to them and not to the neighborhood. While apologetic, some neighbors still wanted access to it.
"Some of them asked me, 'Could we pay?' But we didn't want to go into the Internet service provider business," Mrs. Brodeur said. "We gave some weird story about the network imposing some sort of lockdown protocol."
How do you do When you open your notebook and find out that there are unsecured network ready for you to connect ?
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