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Create Login & Register With Captcha On VB.Net - In this article, I will give you a tutorial on Creating a Captcha Login and Register on VB.Net. Many applications nowadays, be it a website or desktop using this captcha method, especially in the "Login" and "Registration" section of the user. What for ? in short, its function is to make sure that the login or register is true human and not a bot. For more details, read on this article to the end, so you can understand about the captcha function. And can make applications using the captcha method.
What is A Captcha?Captcha literally stands for "Completely Automated Public Turing test to tell Computers and Humans Apart" (quoted from Wikipedia), made to distinguish between machines (bots) and humans. The term Captcha was coined by Luis von Ahn, Manuel Blum, and Nicholas J. Hopper of Carnegie MellonUniversity, and John Langford of IBM in 2000.
why should it be distinguished? because a lot of waste "form criminals" aka SPAM COMMENT programs that can just attack our website at any time without "manners" inserting comments on guestbooks / forums whose contents can be promotions or even links to pornographic sites. that's the possibility that will occur on our website if affected above.
Captcha What Is Used / Functions For?So basically, the main functions of this Captcha are as follows:
- Prevent spam comment in general the web / blog owner / and others do not just want the website to look good in appearance, quantity but of course quality, but do not know if the admin itself is spam
- Prevent spam bots, you know that bots cannot read Captcha, because the string string is fixed. It is impossible for Capthca to change every time it can be read unless the bot comes from the engine blog itself
- Prevent Flood who wants to be on Flood? except for flood like tp if there are many inappropriate words flood, who wants to try? For you who haven't, Flood is sending data over and over again.
- Protecting Email / User Registration (webmail only) Once there was a Yahoo incident and Google was attacked by a bot that registered thousands of emails! thousands of fake e-mails.
In this tutorial, we will use 3 forms, namely as:
- User Login
- User Registration
- Main Form