Method of obtaining information about enemy or potential enemy by stealing their secret data. Espionage is strictly forbidden in most countries and heavily punished as work against the state security, but many countries still perform such actions against others, nevertheless.
According to Hanns and Rudolf by Thomas Harding near the end of WW2 the allies created a large database ... known as CROWCASS, of war criminals which they intended to target once victory was achieved. ...
I was wondering the security of such documents. Documents like letters written by the British generals to each other communicating about their next battle tactic against the Americans. See this link: ...