The spy group used private wireless networks to transmit files, passed data on USB memory sticks and sent text messages, which were all protected and encrypted with custom written 'steganographic' software, that let them hide secret messages otherwise innocent looking files.
Later FBI found the steganographic program written down on a piece of paper and this program was activated by pressing control-alt-E and then typing the 27character password.
The report states that the accused Russian spy Anna Chapman communicated with a Russian official in Manhattan in Jan 2010 as she sat in a coffee shop and he pulled up outside in a van. The FBI alleged that they used a private Wi Fi network via paired computers.
"Law enforcement agents observed and forensically copied a set of computer disks, and based on subsequent investigation,I believe that the password protected disks contain a steganography program employed by a Russia's foreign intelligence agency Sluzhba Vneshney Razvedki and the illegals," said FBI agent Maria Ricci.