Keeping the Smart Grid Secure.  A smart grid delivers electricity from suppliers to consumers using digital technology to monitor (and optionally control)

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Presentation transcript:

Keeping the Smart Grid Secure

 A smart grid delivers electricity from suppliers to consumers using digital technology to monitor (and optionally control) appliances at consumers' homes.  Utilize devices that connect a power source (e.g. a wall outlet) to an appliance. These devices would report: ◦ times an appliance was used ◦ reporting the amount of energy consumed

 US Government has awarded smart grid grants providing for the installation of: ◦ more than 2.5 million smart meters. ◦ more than 1 million in-home energy displays ◦ 170,000 smart thermostats  more than 200,000 smart transformers,

 Consumer electronics devices now consume over half the power in a typical US home.  The ability to shut down or hibernate devices when they are not being used could be a major factor in cutting energy use.  This would mean the electric company has information on personal consumer habits.  Theelectric company could begin making educated guesses on what appliances can be adjusted.

 A computer is left on twenty-four hours a day. ◦ Is the computer being used? ◦ Is it simply a screen saver?  The electric company could, at their discretion, decide your computer is not being used and turn it off for you.

 Basic client-server scheme  Monitoring device failure should not have an adverse effect on the rest of the network  Computing power of the residential SGD must minimal  Must allow for potentially long periods of hibernation

 The ZED contains just enough functionality to wirelessly talk to the parent node ◦ extremely low power consumption ◦ ability to accommodate long hibernation times ◦ simplicity ◦ low cost  Wi-Fi and Bluetooth provide a greater bandwidth, ZigBee's lower power consumption/long battery life make up for the slower 250 kbps.

 wireless transmission of power usage relegated to within the house  personal information must be made secure  data encryption, which uses symmetric key 128-bit advanced encryption standard  To make encryption less processor intensive, use Elliptic Curve Cryptography

 An elliptic curve over real numbers may be defined as the set of points (x,y) which satisfy an elliptic curve equation of the form: y 2 = x 3 + ax + b  For example, let constants a= - 4 and b = 0.67, yielding the equation: y 2 = x 3 - 4x

P + P = 2P = R

 At the heart of every encryption/decryption system is a very difficult math problem.  The success of a cryptosystem lies in the extreme low probability that a hacker can solve the problem in a timely manner.  The Discrete Logarithm Problem is such a mathematical problem and is the basis of the Elliptic Curve Cryptosystem.  "discrete" means we are working with integers

 If we are given an elliptic curve group, we are interested in determining the elliptic curve discrete logarithm problem.  Equivalent to finding a scalar multiple of point P.  Given points P and Q in the group, find a number, k, such that Pk = Q.  Here, the value k is called the discrete logarithm of Q to the base P.

 y 2 = x 3 + 9x + 17 over F 23 ◦ Q = (4,5) ◦ P = (16,5)  Determine the discrete logarithm k  Although intractable, this problem is small, so we can determine a solution by listing out the first few multiples of P until we come up with Q.

 P = (16,5)  2P = (20,20)  3P = (14,14)  4P = (19,20)  5P = (13,10)  6P = (7,3)  7P = (8,7)  8P = (12,17)  9P = (4,5)  9P = (4,5) = Q  we can conclude that the discrete logarithm of Q to the base P is k = 9.

 consider the elliptic curve group described by y 2 = x 3 - 5x +4.  We must find the discrete logarithm of the following points: ◦ Q x = -.35, Q y = 2.39 ◦ P x = -1.65, P y = ◦ In other words, Q =(-.35, 2.39) P = (-1.65, -2.79)

 Using point P, we then double this point to give 2P. ◦ P + 2P = 3P  We continue this process until we find (hopefully) the point Q, our final solution.  P + 6P = 7P = (-.35,2.39)  (take my word for it).  Therefore, the logarithm is 7.

Bob Jane Elliptic Curve P Q Jane gets public-key from Bob k is randomly chosen private key Pk = Q

 Jane gets Bob’s public key and generates her own temporary key pair.  Jane uses her private key and Bob’s public key to generate a secret point on the curve.  Jane uses the x-coordinate of this new point as a session id.  To read an encrypted message, Bob needs the session key, which he gets by combining his private key with Jane’s temporary public key.