The image below represents the common method of generating and verifying CAPTCHAs:Īpplication of different types of CAPTCHA and how to bypass them

General flow of CAPTCHA generation and verification

Search engine bots from indexing pages with personal/ sensitive information.

Scraper bots from gathering your credentials or personal information, upon logging in or while making online payments.

Bots from registering for services such as free email.

Web developers deploy CAPTCHAs on websites to ensure that they are protected against bots. This article outlines the various methods of generating and verifying CAPTCHAs, their application, and multiple ways to bypass CAPTCHAs. That said, there aren’t a lot of automated CAPTCHA solving algorithms available. For instance, there are bots that are capable of solving a text CAPTCHA through letter segmentation mechanisms. However, with the help of Artificial Intelligence, algorithms are getting smarter and bots are now capable of cracking these tests. Generally, computers and computer programs such as bots are not capable of interpreting a CAPTCHA as they generate distorted images with text or numbers, which most Optical Character Recognition (OCR) technologies fail to make sense of. These skills enable humans to read a distorted text image or choose specific images from several different images. The concept of CAPTCHA depends on human sensory and cognitive skills. This has caused a heightened adoption of CAPTCHAs across various online businesses and services. In essence, a CAPTCHA test can tell machines/ computers and humans apart. As a type of Human Interaction Proof, or a human authentication mechanism, CAPTCHA generates challenges to identify users. Completely Automated Public Turing test, to tell Computers and Humans apart, popularly known as CAPTCHA, is a challenge-response test created to selectively restrict access to computer systems. Internet service providers generally face the risk of authentication-related attacks, spam, Denial-of-Service attacks, and data mining bots.

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