CAPTCHA 目次
A captcha (an acronym for "completely automated public Turing test to tell computers and humans apart") is a type of challenge-response test used in computing to determine whether or not the user is human.
Captchas are used to prevent bots from using various types of computing services. Applications include preventing bots from taking part in online polls, registering for free email accounts (which may then be used to send spam), and, more recently, preventing bot-generated spam by requiring that the (unrecognized) sender successfully pass a captcha test before the email message is delivered.
上の画像の文字がパスワードです。などと指示すれば安全というものです。しかし、絶対安全ではないのです。
Tuesday, January 27, 2004 まさに、「いたちごっご」ですね。
Email addressを含んだHPをロボット(プログラム)が抽出するのを阻止
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