The German teenager allegedly behind the havoc-wreaking Sasser virus has gone on trial in Germany.
Sven Jaschan has been charged with sabotaging computers, disrupting public services and altering data illegally.
The 19-year-old is being tried in a juvenile court as he was 17 when he allegedly spread the Sasser worm.
The damaging worm targeted Windows-based computers in May last year and caused widespread disruption. This was despite Microsoft having issued a patch against the Windows vulnerability the worm took advantage of the previous month.
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Organisations and firms that had failed to fully patch their systems against Sasser included British Airways, which was forced to delay flights after its check-in systems crashed; and the Maritime and Coastguard Agency, where staff were forced to return to manual map reading after their computer systems failed.
Microsoft offered a $250,000 (£135,000) bounty to find the people behind Sasser, and this produced a tip-off that led to Jaschan’s arrest.
Jaschan’s trial is expected to last three days. He now works for German security software company Securepoint.