The crooked timber of humanity

By Tom Standage

WannaCry, a computer virus that encrypts data and demands a ransom to unscramble it, hit thousands of computers in May, causing several hospitals in Britain to close their doors. Hardly a week now goes by without a large company admitting that its systems have been breached: Yahoo recently confessed that 1bn accounts had been compromised in an attack in 2013. Cyber-attacks are a scourge of modern life, but their history goes back further than you might expect.

The world’s first national data network was constructed in France during the 1790s. It was a mechanical telegraph system, consisting of chains of towers, each of which had a system of movable wooden arms on top. Different configurations of these arms corresponded to letters, numbers and other characters. Operators in each tower would adjust the arms to match the configuration of an adjacent tower, observed through a telescope, causing sequences of characters to ripple along the line. Messages could now be sent much faster than letters, whizzing from one end of France to the other in minutes. The network was reserved for government use but in 1834 two bankers, François and Joseph Blanc, devised a way to subvert it to their own ends.