Privacy-preserving smart metering
Embodiments of the present disclosure provide method, system and computer program product for privacy preserving smart metering. According to one embodiment of the present disclosure, a plurality of customer-encrypted meter readings are received, each of the plurality of customer-encrypted meter readings being encrypted by a customer using a customer key, then a summation of customer keys is obtained, next the plurality of customer-encrypted meter readings are summed, and the summation of the plurality of customer-encrypted meter readings is decrypted based on the obtained summation of customer keys.
1. A computer-implemented method, comprising:
receiving a plurality of double-encrypted meter readings from a smart meter, each of the plurality of double-encrypted meter readings being encrypted using a double encryption technique, the double encryption technique comprising:
performing a first encryption of each of a plurality of meter readings using a respective utility key as follows:
generating a prime number;
calculating a product of the prime number and a respective meter reading of the plurality of meter readings,
calculating a first sum by summing the respective utility key with the product,
calculating a first remainder by dividing the first sum by 2 n , where n is a bit-length of a plaintext space of the respective meter reading in binary form, and
generating a respective utility encrypted meter reading based on the first remainder; and
performing a second encryption of the utility-encrypted meter readings using a respective customer key as follows:
calculating a second sum by summing the respective customer key with the respective meter reading,
calculating a second remainder by dividing the second sum by 2 n , where n is the bit-length of the plaintext space of the respective meter reading in binary form, and
generating a respective double encrypted meter reading based on the second remainder;
obtaining a summation of utility keys;
obtaining a summation of customer keys;
summing the plurality of double-encrypted meter readings;
decrypting the summation of the plurality of double-encrypted meter readings based on the obtained summation of utility keys and the obtained summation of customer keys; and
determining a trustworthiness of the plurality of double-encrypted meter readings based at least in part on decrypting the summation of the plurality of double-encrypted meter readings.
2. The method of claim 1 , wherein the double-encrypted meter readings are for a given time and from multiple customers.
3. The method of claim 1 , wherein each of the plurality of double-encrypted meter readings is encrypted by a meter based on a prime number space and the respective utility key before being encrypted by the respective customer key.
4. The method of claim 3 , the method further comprising:
obtaining a plurality of utility keys from a plurality of smart meters; and
summing the plurality of utility keys.
5. The method of claim 4 , the method comprising:
further decrypting the decrypted summation of the double-encrypted meter readings based on the prime number space; and
if the result of the further decryption is an integer, determining the further decrypted summation being trustworthy.
6. The method of claim 2 , wherein obtaining a summation of customer keys includes using a secure multi-party computation protocol.
7. A computing system, comprising:
one or more processing units;
one or more computer-readable memory units coupled to the one or more processing units with computer-readable instructions stored thereon, when executed by the one or more processing units implements a method comprising:
receiving a plurality of double-encrypted meter readings, each of the plurality of double-encrypted meter readings being encrypted using a double encryption technique, the double encryption technique comprising:
performing a first encryption of each of a plurality of meter readings from a smart reader using a respective utility key as follows:
generating a prime number;
calculating a product of the prime number and a respective meter reading of the plurality of meter readings,
calculating a first sum by summing the respective utility key with the product,
calculating a first remainder by dividing the first sum by 2 n , where n is a bit-length of a plaintext space of the respective meter reading in binary form, and
generating a respective utility encrypted meter reading based on the first remainder; and
performing a second encryption of the utility-encrypted meter readings using a respective customer key as follows:
calculating a second sum by summing the respective customer key with the respective meter reading,
calculating a second remainder by dividing the second sum by 2 n , where n is the bit-length of the plaintext space of the respective meter reading in binary form, and
generating a respective double encrypted meter reading based on the second remainder;
obtaining a summation of utility keys;
obtaining a summation of customer keys;
summing the plurality of double-encrypted meter readings;
decrypting the summation of the plurality of double-encrypted meter readings based on the obtained summation of utility keys and the obtained summation of customer keys; and
determining a trustworthiness of the plurality of double-encrypted meter readings based at least in part on decrypting the summation of the plurality of double-encrypted meter readings.
8. The system of claim 7 , wherein the meter readings are for a given time and from multiple customers.
9. The system of claim 7 , wherein each of the plurality of double-encrypted meter readings is encrypted by a meter based on a prime number space and the respective utility key before being encrypted by the respective customer key.
10. The system of claim 9 , the method further comprising:
obtaining a plurality of utility keys from a plurality of smart meters; and
summing the plurality of utility keys.
11. The system of claim 10 , the method comprising:
further decrypting the decrypted summation of the double-encrypted meter readings based on the prime number space; and
if the result of the further decryption is an integer, determining the further decrypted summation being trustworthy.
12. The system of claim 7 , wherein obtaining a summation of customer keys includes using a secure multi-party computation protocol.
13. A computer program product being tangibly stored on a non-transient machine-readable medium and comprising machine-executable instructions, the instructions, when executed on an electronic device, causing the electronic device to:
receive a plurality of double-encrypted meter readings from a smart meter, each of the plurality of double-encrypted meter readings being using a double encryption technique, the double encryption technique comprising:
performing a first encryption of each of a plurality of meter readings using a respective utility key as follows:
generating a prime number;
calculating a product of the prime number and a respective meter reading of the plurality of meter readings,
calculating a first sum by summing the respective utility key with the product,
calculating a first remainder by dividing the first sum by 2 n , where n is a bit-length of a plaintext space of the respective meter reading in binary form, and
generating a respective utility encrypted meter reading based on the first remainder; and
performing a second encryption of the utility-encrypted meter readings using a respective customer key as follows:
calculating a second sum by summing the respective customer key with the respective meter reading,
calculating a second remainder by dividing the second sum by 2 n , where n is the bit-length of the plaintext space of the respective meter reading in binary form, and
generating a respective double encrypted meter reading based on the second remainder;
obtain a summation of utility keys;
obtain a summation of customer keys;
sum the plurality of double-encrypted meter readings; and
decrypt the summation of the plurality of double-encrypted meter readings based on the obtained summation of utility keys and the obtained summation of customer keys; and
determining a trustworthiness of the plurality of double-encrypted meter readings based at least in part on decrypting the summation of the plurality of double-encrypted meter readings.
14. The computer program product of claim 13 , wherein the meter readings are for a given time and from multiple customers.
15. The computer program product of claim 13 , wherein each of the plurality of double-encrypted meter readings is encrypted by a meter based on a prime number space and the respective utility key before being encrypted by the respective customer key.
16. The computer program product of claim 13 , the instructions further causing the electronic device to:
obtaining a plurality of utility keys from a plurality of smart meters; and
summing the plurality of utility keys.
17. The computer program product of claim 15 , the instructions further causing the electronic device to:
further decrypting the decrypted summation of the double-encrypted meter readings based on the prime number space; and
if the result of the further decryption is an integer, determining the further decrypted summation being trustworthy.