"This wiki uses information from Watch Dogs Wikia"
DedSec is a secret hacking collective featured in the game Watch Dogs. Among their numbers is the son of Connor Malley (as indicated in the mission "No Turning Back"), and tattoo artist Clara Lille, who directly assists Aiden Pearce.
DedSec is the most famous hacking collective that operates in Watch Dogs' rendition of Chicago. They are not affiliated with Aiden Pearce, though he does have dealings with some of its members. The group itself is opposed to the implementation and use of the ctOS and has the objective of proving that the system is flawed and unnecessary. The group's members hack into various ctOS systems for destructive purposes in order to highlight its weaknesses and vulnerabilities.
One way in which DedSec have voiced their opinion and made their presence known to the public was through their seizure of the ctOS' official website (http://www.chicago-ctos.com/). The website was seized and then subsequently transformed into an ambiguous advertisement page. The page was turned entirely black and covered with a DedSec logo, formed from ASCII characters. Similarly, tagging and graffiti has been sprayed onto a number of ctOS advertisement media and other Chicago signposts.
Audio logs left by one of their members, G1gg1L3s, reveals that DedSec's leaders are referred to as the "Council of Daves", or just "the Daves", because they all include the name Dave in their usernames in online communications.
It is revealed by Clara (under the identity BadBoy17) that DedSec has a militaristic side when they unsuccessfully attacked a ctOS center in The Loop as a result of this attack Blume added more armed guards to the center.