A 22-year-old man behind the hack and blackmail of TalkTalk in 2015 has been sentenced to four years in jail.
Daniel Kelley from South Wales pleaded guilty to 11 offences in 2016, including hacking TalkTalk and his local college, encouraging and assisting hacking, and possessing and offering to supply TalkTalk customer data.
More than 15,600 bank account numbers and sort codes were stolen in the hack, the company said.
Shortly after news of the hack emerged in 2015, shares in TalkTalk lost around a third of their value.
Over a three-year period, Kelley managed to extort £4,400 in the online currency Bitcoin by hacking and blackmailing individuals and companies.
He was sentenced yesterday at the Old Bailey to four years in a young offenders institute.
The Met's Cyber Crime Unit officer and lead investigator, acting detective sergeant Rob Burrows, branded Kelley a "ruthless cybercriminal".
“Kelley is a prolific and ruthless cybercriminal and blackmailer who caused considerable damage, distress, harm and loss to victims’ worldwide," he said.
“From 2013 to 2015, Kelley embarked on a crime spree online for his own financial gain showing no remorse and was a high risk to the public and businesses.
His convictions and sentencing today send out a clear message to cyber criminals committing crime anonymously online they will be identified, arrested and prosecuted for their destructive crimes. I encourage all victims of cybercrime to report incidents to Action Fraud.”