"data theft" is correct and usable in written English.
You can use it when you are referring to the act of stealing data. For example, "The company suffered a huge financial loss due to data theft."
They were investigating a data theft from the bank.
A full assessment of the alleged data theft is ongoing".
(The mail is encrypted, to prevent data theft).
In December, 2014, Swiss prosecutors indicted Falciani for industrial espionage and data theft.
The bank said there were no indications of customer data theft.
Intelligence and communications satellites are also susceptible to interference and data theft.
Falciani was being tried in absentia, for industrial espionage and data theft.
Two teenagers have previously been arrested in connection with the alleged data theft.
The historical whodunnit, and the claims of data theft, turn on the origin of those measurements.
It's now in place across Europe (and beyond) and has greatly reduced data theft (pdf).
It becomes a problem of human motivation, surveillance, and severe penalties for data theft.
