The Past And Present

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Outer limits of filtering?

"This is kind of in the twilight zone," said Richard Smith, a security and privacy expert who runs a Web site called ComputerBytesMan.com.

"You don't need to change text of e-mail; you just need to change the script tags. That's what everybody else does," Smith said.

MSN's Hotmail, for example, filters out JavaScript commands, or tags, in HTML e-mail without changing words, according to an MSN representative.

Many other Web-based services, such as bulletin boards and chat rooms, filter out JavaScript commands too.

"If you don't filter JavaScript, then you can have malicious JavaScript-coded messages that start messing with somebody's e-mail account," Smith noted.

The software that Yahoo uses automatically scans Web-enhanced e-mail and replaces terms that can be confused with Web code. For security reasons, Yahoo's Osako would not disclose which terms are replaced. But an independent test by CNET News.com showed that the terms "eval" and "mocha" and "expression" were replaced with "review," "espresso" and "statement," respectively.

British newsletter site NTK, which first reported the use of the filter, lists other terms that are replaced through Yahoo Mail, including "JavaScript" to "java-script" and "livescript" to "live-script."

"Yahoo is always reviewing and updating our filtering and security systems as part of our ongoing efforts to continually enhance our service,"