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It's trivial for an automated script to connect to an HTTPS site and determine (a) whether the certificate is signed by a signing authority recognized by most browsers, and (b) whether the name of the site matches the site name on the certificate. Virtually all "real" HTTPS sites meet both of these criteria, because the site owners don't want their visitors to encounter scary warning messages from their browser before being asked to enter their credit card number. A connection to an HTTPS site that failed these tests could, at the very least, be blocked as suspicious, and at worst it could be regarded as an act of attempted circumvention.