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OCR In Self-Defense
"CAPTCHA", which is trademarked the Carnegie Mellon University, is a short form for "Completely Automated Public Turing test to tell Computers and Humans Apart". It is a test, which helps the computer to differentiate between machines and human beings. It has the capability of creating and grading tests that automatically accepts all humans and rejects all machines.
“CAPTCHA”, which is trademarked the Carnegie Mellon University, is a short form for “Completely Automated Public Turing test to tell Computers and Humans Apart”. It is a test, which helps the computer to differentiate between machines and human beings. It has the capability of creating and grading tests that automatically accepts all humans and rejects all machines.
The idea is that while as humans we can make out a series of distorted letters and numbers, a machine will not be able to make sense of such images. To learn more about how the program works you can visit http://www.protectwebform.com/. There is also a site for our more advanced version of the program at http://www.protectwebform.com/smartcaptcha.
Having a CAPTCHA installed can protect against bots, which are programs that can repeatedly spam inboxes, try to post and retrieve personal information in chatrooms, and also try to get e-mail addresses and other information to use for promotions to sell services or items, or sign you up for numerous free mail services.
The bots create worms that can cause immense harm to your machine. They crack your passwords, assault privacy and use your personal information for commercial use without your permission.
CAPTCHAS and CAPTCHA plug-ins (http://www.protectwebform.com/plugin_wordpress) intend to prevent these bots from creating havoc. The CAPTCHA programs need the user to recognise and then key in a string of distorted letters and numbers in a box. The string will appear as a distorted image over a ‘noisy’ background. CAPTCHAs are used by various large and small sites. You will find them in mail services, banking sites, blogs, chat rooms and similar places.
Spammers send unsolicited messages in bulk to you inbox. These messages are not desirable at all. The most common kind of spam is email spam. However there can be other spam too in the form of usenet newsgroup spam, log spam, search engine spam, instamessaging spam and similar others.
The reason why advertisers resort to spamming is because it does not cost much. They have to bear only the cost of managing the list of individuals that are targeted to receive the mails. Moreover, you cannot hold the sender accountable for the mass mailers they send. Spamming has become really ubiquitous since there are no entry barriers. No wonder your inbox is always flooded with mass mailers.
Usenet spam is a message that can be sent to twenty or more Usenet newsgroups. This kind of spam floods the newsgroups with unnecessary advertisement and posts. It also challenges your ability to accept and manage the topics on the system.
There is another kind of email spam that targets individuals with direct messages. It scans postings from Usenet or pilfers from the Internet mailing list. This kind of spamming involves some expenditure.