Ajay Garg, an assistant programmer with CBI, worked with IRCTC (Indian Railway Catering and Tourism Corporation Ltd) for four years between 2007-11 where he learnt the vulnerabilities of the railway ticketing system, sources said.
Garg has been arrested along with close aide Anil Gupta, a private person who distributed the software to agents for a price. Besides, 10 agents -- seven in Jaunpur and three in Mumbai -- have been identified, the sources said.
"The vulnerabilities of the IRCTC system still exist," an official said.
A postgraduate in computer applications, Garg allegedly sold the software through Gupta.
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