Monday’s update addressed a gaffe introduced last week when Microsoft blocked six additional root certificates issued by DigiNotar that were cross-signed by a pair of other certificate authorities (CAs). Microsoft re-released an update for Windows XP to correct a snafu that left users vulnerable to potential “man-in-the-middle” attacks for most of last week. Servers run [...]

A Journal article last year covered some of the most basic ways in which users can control “cookies,” “beacons” and “Flash cookies,” small computer files or software programs installed on a user’s computer by the Web pages that are visited. That remains a good place to start, and research indicates that the vast majority of tracking [...]