Augmented Data Selector to Initiate Text-Based CAPTCHA Attack

Table 3

User experience against five different security strengths of text-based CAPTCHAs.

Image examples	Image features					Humans	Usability score
	Noises	Overlapping	Rotation	Distortion	Waving	Accuracy rate (%)
						99	4.8
						93	3.7
						92	3.4
						85	3
						33	2