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History Of Internet.
Some times we see that some artistic crazy letters or characters bellow of the registry from. What is it? what does it do?............ To know
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Why Do We Need CAPTCHAs?
Websites like Hotmail (or GMail, or Yahoo) are useful. Lots of people like them. But there's a problem: spammers like them too! Hotmail accounts are convenient for sending unwanted junk mail. So, spammers create bogus Hotmail accounts to spam us with. And they create as many as possible, as quickly as they can. That's a pain in the butt for everybody, including Microsoft (the owners of Hotmail).
How CAPTCHAs Usually Work
The traditional solution is to display a picture which contains letters and numbers turned at funny angles, distorted, and so forth. Everyone has seen this on Yahoo, GMail or Hotmail while applying for an account. The idea is that people can read them, but computers... hopefully... can not. Websites like Hotmail require people to type in these letters and numbers before they are allowed to apply for a new account.
Captchas Are Not Perfect... Not Even Close
Sounds like a good idea - so what's the catch? Well, there are several problems: 1. Computers can break 'em anyway... although amateur programmers won't have an easy time doing so. Greg Mori and Jitendra Mailk's Breaking a Visual CAPTCHA discusses advanced techniques that can be used to crack even fairly sophisticated captcha systems.
2. Some humans can't break 'em! Obviously, blind users can't solve a visual captcha. Better captcha systems also offer an audio-based option. Even then, deafblind users (those who are both deaf and blind) are locked out. Sites employing captchas should at least consider offering special accounts to those with special needs in this area. One solution is to offer a telephone number - and make sure you accept TDD relay calls! These are voice calls placed through an interpreter. Your telephone support staff should be educated about this and encouraged to create accounts or carry out other captcha-protected tasks on behalf of legitimate users who contact you via phone.
3. Captchas can take up extensive CPU resources (that is, slow down your web server generating all of those images).
4. Bad guys will, in some cases, hire humans to do the data entry instead, or at least to do the captcha-solving part. If your troublemakers are determined to get past the captcha, they can.
2. Some humans can't break 'em! Obviously, blind users can't solve a visual captcha. Better captcha systems also offer an audio-based option. Even then, deafblind users (those who are both deaf and blind) are locked out. Sites employing captchas should at least consider offering special accounts to those with special needs in this area. One solution is to offer a telephone number - and make sure you accept TDD relay calls! These are voice calls placed through an interpreter. Your telephone support staff should be educated about this and encouraged to create accounts or carry out other captcha-protected tasks on behalf of legitimate users who contact you via phone.
3. Captchas can take up extensive CPU resources (that is, slow down your web server generating all of those images).
4. Bad guys will, in some cases, hire humans to do the data entry instead, or at least to do the captcha-solving part. If your troublemakers are determined to get past the captcha, they can.
How To Add A Captcha To Your Site
Now that you know what a CAPTCHA is, you might want to add one to your own site. To learn how to do that, just check out my separate article how do I add a CAPTCHA to my web form? There I provide a complete CAPTCHA solution and discuss how it works.
Question: What is CAPTCHA? Why Do I Have To Type In Those Crazy Letters?
If you have ever tried to register with a website or comment on a blog and been asked to enter some crazy letters that have been all jumbled up, you know how frustrating it can sometimes be to tell an L from a 1 or a J from an I.
I know. I've been there. I've sat up and peered at the computer screen trying to figure out if the offset line was supposed to be the curl of a J or the straight line of an I. And I've muttered under my breath how they should just take the similar-looking letters out of the algorithm to save me the frustration.
So, what are those crazy letter and why do we have to type them in?
I know. I've been there. I've sat up and peered at the computer screen trying to figure out if the offset line was supposed to be the curl of a J or the straight line of an I. And I've muttered under my breath how they should just take the similar-looking letters out of the algorithm to save me the frustration.
So, what are those crazy letter and why do we have to type them in?
Answer: They are called CAPTCHA, and they are a human response test. The reason websites have CAPTCHA is spam. Those crazy letters are a way to check if the person registering or trying to comment is a real live human being as opposed to a computer program attempting to spam the site. Yes, it's the same reason most of us have some form of spam blocker on our email.
Spam is the modern day equivalent of junk mail. But, if the spammers were in charge, the junk mail wouldn't just be in your mailbox or tied to your doorknob. It would litter your yard, bury the car parked in your driveway, plaster every side of your house, and cover your roof.
And, while it is frustrating to continually be asked to enter in tangled letters from an image, it is well worth it in the long run. I run a blog, so I have seen the spam up close and personal. If I didn't use some type of protection like CAPTCHA against it, I would be getting dozens of spam comments a day. And my personal blog isn't very popular. I can only imagine what the popular blogs must see.
So, next time you run up against one of those images and get a little frustrated trying to tell a Q from an O, just remember not to vent your frustration at the website. Focus it on the spammers, because they are the reason we have to squint at our screen almost every time we want to register at a new website.
Spam is the modern day equivalent of junk mail. But, if the spammers were in charge, the junk mail wouldn't just be in your mailbox or tied to your doorknob. It would litter your yard, bury the car parked in your driveway, plaster every side of your house, and cover your roof.
And, while it is frustrating to continually be asked to enter in tangled letters from an image, it is well worth it in the long run. I run a blog, so I have seen the spam up close and personal. If I didn't use some type of protection like CAPTCHA against it, I would be getting dozens of spam comments a day. And my personal blog isn't very popular. I can only imagine what the popular blogs must see.
So, next time you run up against one of those images and get a little frustrated trying to tell a Q from an O, just remember not to vent your frustration at the website. Focus it on the spammers, because they are the reason we have to squint at our screen almost every time we want to register at a new website.
Spam (electronic)
E-mail spam
What is spam?
Spam is flooding the Internet with many copies of the same message, in an attempt to force the message on people who would not otherwise choose to receive it. Most spam is commercial advertising, often for dubious products, get-rich-quick schemes, or quasi-legal services. Spam costs the sender very little to send -- most of the costs are paid for by the recipient or the carriers rather than by the sender.
There are two main types of spam, and they have different effects on Internet users. Cancellable Usenet spam is a single message sent to 20 or more Usenet newsgroups. (Through long experience, Usenet users have found that any message posted to so many newsgroups is often not relevant to most or all of them.) Usenet spam is aimed at "lurkers", people who read newsgroups but rarely or never post and give their address away. Usenet spam robs users of the utility of the newsgroups by overwhelming them with a barrage of advertising or other irrelevant posts. Furthermore, Usenet spam subverts the ability of system administrators and owners to manage the topics they accept on their systems.
Email spam targets individual users with direct mail messages. Email spam lists are often created by scanning Usenet postings, stealing Internet mailing lists, or searching the Web for addresses. Email spams typically cost users money out-of-pocket to receive. Many people - anyone with measured phone service - read or receive their mail while the meter is running, so to speak. Spam costs them additional money. On top of that, it costs money for ISPs and online services to transmit spam, and these costs are transmitted directly to subscribers.
One particularly nasty variant of email spam is sending spam to mailing lists (public or private email discussion forums.) Because many mailing lists limit activity to their subscribers, spammers will use automated tools to subscribe to as many mailing lists as possible, so that they can grab the lists of addresses, or use the mailing list as a direct target for their attacks.
(For more information about the origin of the term "spam", and the formal definitions of Usenet spam, see J.D.Falk's excellent Net Abuse FAQ)
More About Spam...
Spam is any kind of unwanted online communication.
The most common form of spam is unwanted e-mail. You can also get text message spam, instant message spam (sometimes known as spim), and social networking spam.
Some spam is annoying but harmless. However, some spam is part of an identity theft scam or another kind of fraud. Identity theft spam is often called a phishing scam.
To protect yourself against e-mail spam, use e-mail software with built-in spam filtering. For more information, see Help keep spam out of your inbox.
Some times you see in your browser show your password automatically. How can you remove it? You may delete the cookies. For do this see the information bellow:
Open to you browser and go Tools tab
Like this:
You must see that the just bellow of the View Cookies there are View Saved Passwords you remove all such remove View Cookies.
After that go page Info - Security -> View Cookies - Remove Cookies/Remove All Cookies
Like this:
Open to you browser and go Tools tab
Like the picture go
Delete Browsing History...
Press
Delete
Mind it: All of the history you may saved will be deleted by this activities.
Here you press Ctrl+h
on the right hand side you can see Edit items... press it. Here you can see on left hand side select the choosing item and press Remove selected items or press Clear all browsing data...
here open a new windowt. Then you may select all or as you wish after that select Everythisng bellow side as you wish then press Clear browsing data and then Done removing items.
