A former member of the hacker gang Kryogeniks was sentenced to four months in prison Monday for his role in a 2008 stunt that replaced Comcast’s homepage with a shout-out to other hackers.

James Robert Black Jr., 21,was known as “Defiant” when he and two other hackers hijacked Comcast’s domain name in May of 2008 — a prank that took down the cable giant’s homepage and webmail service for more than five hours, and allegedly cost the company over $128,000.

Visitors to Comcast.net had been redirected to a simple page reading “KRYOGENIKS EBK and DEFIANT RoXed COMCAST sHouTz To VIRUS Warlock elul21 coll1er seven.”

“Mr. Black and his Kryogenicks crew created risks to all of these millions of e-mail customers for the simple sake of boosting their own childish egos,” Assistant United States Attorney Kathryn Warma told the court, according to a press release. “The callous disregard of the dangers posed to others, as well as the arrogance and recklessness displayed by these, and other hackers in committing such crimes should be considered by the Court as a factor that weighs in favor of a significant prison sentence.”

Secret-spilling site Cryptome was hacked over the weekend, possibly exposing the identities of whistleblowers and other confidential sources, according to a hacker who contacted Wired.com and claimed responsibility for the breach.

The hacker said two intruders from the group Kryogeniks breached the long-running site, where they gained access to a repository of secret files and correspondence. Among them, the hacker claimed, were the records of self-proclaimed WikiLeaks insiders who have been the source of several unconfirmed tips supposedly detailing internal WikiLeaks matters.