Good old steganography was used here in this case!
"According to a Department of Justice (DOJ) indictment, the US citizen hid confidential files stolen from his employers in the binary code of a digital photograph of a sunset, which Mr Zheng then mailed to himself.
It was a technique called steganography, a means of hiding a data file within the code of another data file. Mr Zheng utilised it on multiple occasions to take sensitive files from GE. ... The information Zheng stole was related to the design and manufacture of gas and steam turbines, including turbine blades and turbine seals."
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