CAPTCHA or ‘Completely Automated Turing test to tell Computers and Humans Apart’ was introduced as a challenge-response security test to differentiate between genuine users and bots that have a negative impact on your online business.

A CAPTCHA can protect your website by generating tests or puzzles that human can pass, but bots cannot. CAPTCHAs have been evolving since they were developed. Early CAPTCHAs displayed distorted letters, numbers, and words which can be read by humans but not by bots. Later versions show an assortment of images, from which users must select all the images that show a particular object such as a storefront or traffic signals. While they have proven to be useful in the battle against bots, it is essential to know when to use and when not to use them.

With Radware Bot Manager, we apply a challenge-response authentication mechanism and serve CAPTCHAs to visitors with a higher risk score. Responses to the challenges help us build a closed-loop feedback system that dynamically improves our machine learning algorithms and helps us accurately block bad bots, app impersonators, and emulators.

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