Tag Archive 'Captcha'

How to Prevent Spam Attacks – Protecting Your Inbox

Spam is by far the most annoying concept in existence on the internet, aggravating thousands of webmasters and contributing to the defacing of just as many websites on a daily basis. Spam wastes time, money, server space, and energy, by clogging up email boxes, and even worse, cluttering the comments sections of nearly every unsecured blog. Spam is like the prank phone call of the internet, and in order to stop it, you’ll need to take a few measures that will prevent spammers form accessing the information they need.

Email Privacy

Perhaps the most common form of spam is email spam, which reduces your productivity by populating your inbox with unwanted spam posts. To avoid the aggravation associated with email spam, you should consider keeping your email private at any expense. That means you should not post your email address on forums, chat rooms, blogs, websites, or any other venues that can be publicly viewed by spammers. If you absolutely must to display your email address publicly online, then consider writing it without the @ symbol. For example – nospamexampleemailaddress at exampleemail dot com. The reasoning behind this is actually quite simple; spammers usually use programs that automatically search the web and scrape lists of email addresses by searching for @ symbols. Writing your email address in the above format is a great way to prevent spammers form finding your email address automatically.

Preventing Contact Form Attacks

Another way spammers can access your business email is through the “Contact Us” form on your website. If you have a contact form enabled on your website, you’ll need to make sure you have security measures in place to prevent spammers from using bots to repeatedly send emails through your contact form. Spammers love using this method to exploit business inboxes, because most contact forms only require a few simple fields to be filled out, such as name, email address, and subject. To prevent spam attacks from automated bots through your contact form, you’ll need to require the use of a Captcha form, which only a valid human could fill out.

Captcha

The Captcha test is is an entry field that is used to prevent hackers from exploiting sites with automated programs. If you have ever created an email account, then you have probably seen a Captcha form before. Captcha basically generates an image complete with a variety of letters and characters, and then requires the user to input the information on the screen. In the early days o Captcha, the images generated were simple, and as hackers adjusted to these Captcha images, the developers had to increase the difficulty of these images. The modern versions of the Captcha system consist of two to three words and are very difficult to circumvent.

Conclusion

Although spam is a common problem and is not going to disappear any time soon, there are measures that can be taken to keep spammers from targeting your email. The first step in preventing spam would be following the recommendations above and using common sense when it comes to distributing your business email address. If you’re still having trouble with spam attacks from more determined individuals like your competitors, then you may want to employ the services of a spam blocking program.

Category: Security Issues
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Posted on Tuesday, Feb 16, 2010
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Use Captcha To Keep Spammers At Bay

One of the first and most annoying things that can happen to a new web site owner is being blasted with spam.  There is a dilemma presented when wanting to have potential customers or clients contact you or your company.  Either your email has to be publicly posted or you will need to enable a form to allow quick and easy contact.  When you do implement either choice, spammers will come and they will do as much damage as is possible.

Email link – bad idea

The first thing that should be done is to toss out the idea of publicly placing your email address in any form that can be clicked as a link.  Using a linked email address publicly is an open invitation to spammers.  Nothing can be more unpleasant than having to start off your business day wading through hundreds upon hundreds of spam content in your email in-box.  If you must use this route, simply place your email in text only – this will make it harder for a potential spammer as they will have to physically copy and paste your address into any email.  Inconvenience is the bane of the spammer.

Contact form – can be attacked

If you’ve decided to place a contact form anywhere within your web site, you’ll want to enable some type of security to ensure that an actual human is utilizing the form.  This sounds simple enough because, after all, the purpose of the form is to gather human information.  However, most email forms have a standard “name”, “email”,  “subject”, “content” style to them that is easily recognized and exploited by spammers.  Using this standard information, spammers use automated systems to attack a contact form – computer to computer.  What can stump them is requiring something that only a human can input or answer and that isn’t part of the standard email form.  This is where Captcha comes in.

Contact form with Captcha – better idea

Captcha is a type of test that is used to ensure human interaction.  The premise behind Captcha is that computers should not be able to solve something that requires human input.  The very early implementations of Captcha were simple generations of a word or series of letters with some small amount of warping.  However, spammers quickly adjusted to this warping and this initial Captcha implementation had to be abandoned.  Modern Captcha uses two to three regular words that are segmented and have lines through the words making it much more difficult to automatically guess via a computer system.

This all culminates into a small bit of either PHP or Javascript that is placed within your form before the submit button coding.  After filling out the rest of the form, a user must then enter the correct words generated within the Captcha coding.  You can set the form to lock out a user after a certain number of errors thus staving off the possible attack of spammers for yet another day.

Conclusion

Of course, the simplest way to avoid spammers at all is by not allowing any sort of email contact within your site.  But this is not a feasible option – after all, you have your web site online for the purpose of contacting new and old customers or clients.  So, before putting your email form online, use a bit of quick security and incorporate Captcha.

Category: Security Issues
Tags: , , , , , , ,
Posted on Friday, Nov 06, 2009
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