A man has been jailed for a minimum of three and a half years for trying to groom three Leicestershire and Northumberland schoolgirls via the web.
Shaun Martin Pudwell, 40, of Napier Road, Gillingham, Kent, denied attempting to groom the girls, aged 13 and 12, for sex.
Last month he was convicted of 12 charges relating to child sex offences at Leicester Crown Court.
Police had to break a code to view images on Pudwell's computer.
In October he was found guilty of charges including five counts of making indecent photographs of a child, inciting child prostitution or pornography and three counts of causing a child to watch a sexual act.
During his trial, the court heard Pudwell targeted his victims through social networking websites.
His arrest followed a nationwide investigation, led by Leicestershire Constabulary, into his online paedophile activities.
After he was jailed on Friday, the mother of one of his Leicestershire victims said: "She saved everything that he sent down to her on the computer and she showed a friend.
"She was at a friend's house at the time and they told her mother, who told me.
"I just couldn't believe it, and went straight to the police. I just couldn't believe anybody could do such a thing.