What type of Captcha signs are there and what do they mean?
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Answer:
When you are saying CAPTCHA signs that is a little confusing...CAPTCHA are only going to show up letter and/or symbols for Text-Bases Authentication and RECAPTCHA will show you any random 2 word combinations. Any website that has a comments/forums/blogs page usually requires some kind of text-based Authentication such a ReCaptcha. Although it is a good tool you still have issues...Cannot tell the difference between a human or BOT -- Hard to read verbiage -- Inappropriate words combined together -- Still receiving SPAM -- Not very secure - etc.... You want to look for Image-Based Authentication products to help make your password more secure and eliminate the risk of SPAM, some companies will allow you to customize these images and even advertise for example Confident Technologies out of California has a really good product.
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