Jester Jester A jester, court jester, or fool, was historically an entertainer during the medieval and Renaissance eras who was a member of the household of a nobleman or a monarch employed to entertain him and his guests. A jester was also an itinerant performer who entertained common folk at fairs and markets. Jesters are also modern-day entertainers who resemble their historical counterparts. Jesters in medieval times are often thought to have worn brightly coloured clothes and eccentric hats in a motley pattern and their modern counterparts usually mimic this costume. Jesters entertained with a wide variety of skills: principal among
The Jester (hacktivist) where he had an image of his signature Jester icon and an embedded, hidden code that allegedly exploited a vulnerability that affects Safari, Chrome and Android browsers. "When anyone scanned the original QR code using an iPhone or Android device, their device would silently make a TCP shell connection back to my remote server," The Jester wrote. "Like a phone call, if you like." Apparently, once connected to the Jester's server, the network diagnostic tool Netcat checked the connecting mobile device to see if it had Twitter software installed. Twitter account information was then harvested and checked against a list