Tick Tock Break the Clock: Breaking CAPTCHAs on the Darkweb. - David Holm Audran; Marcus Braunschweig Andersen; Mark Højer Hansen; Mikkel Møller Andersen; Thomas B. Frederiksen; Kasper H. Hansen; Dimitrios Georgoulias; Emmanouil Vasilomanolakis (SECRYPT, 2022)