Computer security – stoimen's web log on web development Tue, 13 Feb 2018 08:18:15 +0000 en-US hourly 1 https://wordpress.org/?v=5.0.3 Using rand() for a CAPTCHA! /2010/05/01/using-rand-for-a-captcha/ /2010/05/01/using-rand-for-a-captcha/#comments Sat, 01 May 2010 17:22:24 +0000 /?p=1521 Related posts:
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]]> What if you have to add a simple CAPTCHA for a web form asking the user to sum two numbers. Will you prefer to use rand() to generate those two numbers? Some may say this is too predictable!

Related posts:

  1. JavaScript random numbers
  2. How to Overcome Zend_Cache_Frontend_Page’s Problem with Cookies
  3. Automatically Upload Images with PHP Directly from the URI
  4. How to Sanitize User Input in PHP?

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