UK hacker jailed for six years for blackmailing pornography site users

Zain Qaiser targeted millions of computers with ransomware demanding large sums

A hacker who blackmailed users of pornography websites in what investigators say is the UK's most serious cybercrime case has been jailed for six years and five months.

Zain Qaiser targeted millions of computers with malicious browser-locking software that demanded payment of up to $1,000 (765) to unfreeze screens, Kingston crown court heard.