A 19-year-old man from Carmarthenshire has been charged in connection with international computer crimes.
Daniel Mark Kelley from Llanelli has been accused of blackmail and money laundering.
He has also been charged in connection with an attack on a college computer system, which later affected coursework submissions and exam administration at Coleg Sir Gar, Llanelli.
He is due to appear at Westminster Magistrates' Court on 12 September.
Police from the Tarian Regional Cyber Crime Unit said he has also been charged with blackmailing an Australian company's employee on four occasions after allegedly exploiting vulnerabilities of the company's website to access confidential customer information.
He is also accused of blackmailing a Canadian employee with emails and phones calls to his home after allegedly hacking into private data.
He has been bailed ahead of the court appearance.