Who controls the [Smart Meter] ‘off’ switch? ~ Prof. Ross Anderson, Cambridge University

[Ross Anderson is a Professor of Security Engineering at the University of Cambridge Computer Laboratory. He has persistently argued that, by their nature, large databases will never be free of abuse by breaches of security.  He has said that if a large system is designed for ease of access it becomes insecure; if made watertight it becomes impossible to use.  This rule of thumb is sometimes known as ‘Anderson’s Rule’.

In the enclosed paper, Prof Anderson and a colleague take a scholarly look at the vulnerabilities baked into the Smart Meter pie. [/]


We’re about to acquire a significant new cyber-vulnerability. The world’s energy utilities are starting to install hundreds of millions of ‘smart meters’ which contain a remote off switch. Its main purpose is to ensure that customers who default on their payments can be switched remotely to a prepay tariff; secondary purposes include supporting interruptible tariffs and implementing rolling power cuts at times of supply shortage.

The off switch creates information security problems of a kind, and on a scale, that the energy companies have not had to face before.  From the viewpoint of a cyber attacker – whether a hostile government agency, a terrorist organisation or even a militant environmental group – the ideal attack on a target country is to interrupt its citizens’ electricity supply.  This is the cyber equivalent of a nuclear strike; when electricity stops, then pretty soon everything else does too.  Until now, the only plausible ways to do that involved attacks on critical generation, transmission and distribution assets, which are increasingly well defended.

Smart meters change the game.  The combination of commands that will cause meters to interrupt the supply, of applets and software upgrades that run in the meters, and of cryptographic keys that are used to authenticate these commands and software changes, create a new strategic vulnerability, which we discuss in this paper.

Read the paper here: Who controls the off switch.pdf.