LOS ANGELES (AP) ― A man was charged with hacking into the emails of Christina Aguilera, Scarlett Johansson and Mila Kunis in a computer invasion scheme that targeted Hollywood celebrities, federal authorities said Wednesday.

Christopher Chaney, 35, was arrested without incident as part of a yearlong investigation of celebrity hacking that was dubbed “Operation Hackerazzi.” Chaney, who was expected to appear in a Florida courtroom later Wednesday, was charged with 26 counts of identity theft, unauthorized access to a protected computer and wiretapping.

If convicted, he faces up to 121 years in prison. It wasn’t immediately known if he had retained an attorney.

Authorities said Chaney was responsible for stealing nude photos taken by Johansson herself and were later posted on the Internet. Chaney offered some material to celebrity blog sites but there is no evidence that he profited from his scheme, said Steven Martinez, assistant director in charge of the FBI’s Los Angeles office.

“Celebrity information is highly marketable,” said Martinez, who added his office continues to receive complaints about celebrities’ having their personal information breached.

There were more than 50 victims, including Kunis, Aguilera and actress Renee Olstead. Others were named only by initials and investigators wouldn’t identify if they were famous, but said those who were named as victims in the indictment agreed to have the identities made public.

“It helps get out the message that cyber-hacking is a real threat,” said U.S. Attorney Andre Birotte, who called those who engage in such activity as “scum.”

Chaney hacked Google, Apple and Yahoo email accounts beginning last November through February, then hijacked the forwarding feature so that a copy of every email received was sent, “virtually instantaneously,” to an email account he controlled, according to an indictment handed up Tuesday by a federal grand jury in Los Angeles.

He allegedly used the hacker names “trainreqsuckswhat,” “anonygrrl” and “jaxjaguars911,” and also used the victims’ identities to illegally access and control computers. Chaney is accused of damaging email servers that caused losses of at least $5,000 per instance.

Authorities wouldn’t say whether Chaney was able to access email accounts via cellphones, but he was able to figure out secure passwords to various celebrity accounts through information that had been made public.

A message seeking comment was left on an answering machine for a Christopher Chaney in Jacksonville. There was no answer at a telephone listing for another Christopher Chaney.

Celebrities and people in the news have long been targets of privacy invasion but concerns have redoubled in the Internet age.