“Hack the cloud server” is an objective in the Fourth Interlude in Assassin's Creed IV Black Flag in Abstergo Entertainment.
Walkthrough[edit]
Head out from the Security room and turn to the left at the cross section. Follow that path over to the Cloud Server room. Go inside.
These Cloud Servers have 2 layers of Security on them. This one's first layer is a Prime Number Puzzle. The target is "1029". The Solution is "3*7*7*7". Behind that you have a Data Stream Puzzle. It looks like this, just moving:
Successfully hack this to get the next cutscene. This will also unlock more content for you to see, "Pirates of Nightmares" and a message from Juno.