"I've visited 50 to 60 schools, and each time at least one girl tells me she has had this kind of problem," he said.
Floss's suspicions were confirmed when he discovered a so-called Trojan virus on one of the girl's computers.
Prosecutors confirmed an investigation was ongoing but declined to comment on the number of victims.
A widespread problem The case was discovered by Thomas Floss, a data protection advocate who gives presentations in schools to promote awareness of safe Internet practices.
It was severely damaged in an earthquake back in 1963.
The city has some historic churches and interesting monuments.
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Police used the man's Internet Protocol (IP) address to track him to his home, according to an association of German data protection specialists.
The daily Westfalenblatt reported that the man spied used a computer virus to spy on over 150 girls.
German politicians and police proposed measures to crack down on Internet crime and improve education of young Internet surfers.