CN104125074A - Charging method with privacy protection in smart power grid - Google Patents

Abstract

The invention discloses a charging method with privacy protection in a smart power grid. The charging method comprises the following steps that: a smart electric meter records the electric quantity used by a user in real time, encrypts the recorded data by means of co-state encryption, and sends ciphertexts to a polymerizer; after a time period, the polymerizer summates the collected ciphertexts about the electric quantity used by the user, and then decrypts the ciphertexts to obtain the plaintext of the electric quantity sum used by the user during the time period; finally the polymerizer sends the plaintext to a charging department, and the charging department calculates to obtain the electric utilization charge of the user. In the charging method disclosed by the invention, the electric quantity condition consumed by the user cannot be obtained by any department except the polymerizer, and the consumption details cannot be known, thus furthest ensuring the security of user information, and effectively preventing the user information from being peeped.

Description

In a kind of intelligent grid, there is the charging method of secret protection

Technical field

The invention belongs to intelligent grid billing technology field, specifically in a kind of intelligent grid, there is the charging method of secret protection.

Background technology

Growing along with intelligent grid, countries in the world increase day by day for the demand of intelligent user terminal, and according to statistics, at the five-year, along with intelligent grid is in the construction of countries in the world, the quantity that intelligent electric meter is installed in the whole world will be up to more than 200,000,000 only.Equally, the progress of building along with China intelligent grid, also can increase substantially as the demand of the intelligent electric meter of user side, conservatively estimates that market will have the demand of 1.7 hundred million left and right.But intelligent electric meter can inadvertently be revealed user makes the details of power consumption to Utilities Electric Co..For example, intelligent electric meter can recording user electric weight service condition at any time.And collect to such an extent that bulk information may bring serious consequence to consumer by intelligent electric meter.Therefore, user is more and more concerned about the middle privacy concern of intelligent electric meter.So in intelligent grid, the billing scheme that research and development have secret protection is very important.

Summary of the invention

In view of above-mentioned Privacy Protection, the object of this invention is to provide the charging method in a kind of intelligent grid with secret protection, the method can solve user and make the leakage problem of power consumption details, has ensured the safety of user profile on to greatest extent.

Object of the present invention is achieved through the following technical solutions:

A charging method in intelligent grid with secret protection, is characterized in that, the electric weight that the method is used by intelligent electric meter real time record user adopts the data of the method scrambled record of homomorphic cryptography, and ciphertext is sent to polymerizer.After a time period, polymerizer sues for peace the ciphertext of power consumption by what collect about certain user; Then decrypting ciphertext, obtains user and makes in this time period the plaintext of power consumption summation; This plaintext is sent to charging department (Utilities Electric Co.) by last polymerizer, and Utilities Electric Co. calculates this user's electricity cost.Concrete steps are as follows:

1) initial phase: suppose that k is a security parameter.Polymerizer produces the public affairs-private key pair of homomorphic cryptography:

KG(1 ^k)→(SK，PK) (1)

2) data fetch phase: intelligent electric meter reads the electric weight P that user consumes in real time _i, and it is carried out to homomorphic cryptography:

CT _{i}＝HE(P _i，PK)，i＝1，2，...，N (2)

Intelligent electric meter is by CT _isend to polymerizer.

3) the data aggregate stage: polymerizer calculates certain user after a time period sues for peace the ciphertext of power consumption:

$\mathrm{CT}={\mathrm{\Σ}}_{i=1}^N{\mathrm{CT}}_i={\mathrm{\Σ}}_{I=1}^N\mathrm{HE}(P_i,\mathrm{ID},\mathrm{RK})=\mathrm{HE}({\mathrm{\Σ}}_{I=1}^N{P}_i,\mathrm{RK})---\left(3\right)$

Then polymerizer decrypting ciphertext:

$\mathrm{HD}(\mathrm{SK},\mathrm{CT})={\mathrm{\Σ}}_{I=1}^N{P}_i---\left(4\right)$

Last polymerizer is by this user's electric quantity consumption summation send to power department.

4) the paying stage: the expense that Utilities Electric Co. calculates this user is:

$C=\mathrm{CostComp}\left({\mathrm{\Σ}}_{i=1}^N{P}_i\right)---\left(5\right)$

Beneficial effect of the present invention is: the electric weight situation consuming in real time due to user is to send after the public key encryption with polymerizer, so except polymerizer, can obtain the electric weight situation of user's consumption without any department.Utilities Electric Co. only knows that user is in the summation of section internal consumption electric weight sometime, and does not know its consumption details, has ensured the safety of user profile on to greatest extent, has effectively prevented that user profile from being peeped.

Brief description of the drawings

Fig. 1 is flow process frame diagram of the present invention.

Embodiment

In intelligent grid, have a charging method for secret protection, Fig. 1 is flow process frame diagram of the present invention.The electric weight being used by intelligent electric meter real time record user, adopts the data of the method scrambled record of homomorphic cryptography, and ciphertext is sent to polymerizer.After a time period, polymerizer sues for peace the ciphertext of power consumption by what collect about certain user; Then decrypting ciphertext, obtains user and makes in this time period the plaintext of power consumption summation; This plaintext is sent to Utilities Electric Co. by last polymerizer, and Utilities Electric Co. calculates this user's electricity cost.Concrete steps are as follows:

1) initial phase: suppose 1 ^kit is a security parameter.System produces the public affairs-private key pair of homomorphic cryptography:

KG(1 ^k)→(SK，PK) (1)

Wherein KG (1 ^k) be that secret key produces algorithm.A security parameter 1 of this algorithm input ^k, output public private key pair (SK, PK).

2) data fetch phase: intelligent electric meter reads the electric weight P that user consumes in real time _i, and it is carried out to homomorphic cryptography:

CT _{i}＝HE(P _i，PK)，i＝1，2，...，N (2)

Wherein HE (P _i, PK) and be the cryptographic algorithm of a homomorphic cryptography.The electric weight P that this algorithm input PKI PK and user consume _i, defeated

Go out ciphertext CT _{{ i}}.Intelligent electric meter is by CT _{{ i}}send to polymerizer.

3) the data aggregate stage: after a time period, polymerizer makes the ciphertext summation of power consumption to certain user:

$\mathrm{CT}={\mathrm{\Σ}}_{i=1}^N{\mathrm{CT}}_i={\mathrm{\Σ}}_{I=1}^N\mathrm{HE}(P_i,\mathrm{ID},\mathrm{RK})=\mathrm{HE}({\mathrm{\Σ}}_{I=1}^N{P}_i,\mathrm{RK})---\left(3\right)$

Wherein CT _ifor user is in the ciphertext of moment i consumes power, CT is expressly ciphertext.

Then polymerizer decrypting ciphertext:

$\mathrm{HD}(\mathrm{SK},\mathrm{CT})={\mathrm{\Σ}}_{I=1}^N{P}_i---\left(4\right)$

The decipherment algorithm that wherein HD (SK, CT) is homomorphic cryptography.This algorithm input private key SK and ciphertext CT, output is expressly corresponding

Last polymerizer is by this user's electric quantity consumption summation send to power department.

4) the paying stage: the expense that Utilities Electric Co. calculates this user is:

$C=\mathrm{CostCompt}\left({\mathrm{\Σ}}_{i=1}^N{P}_i\right)---\left(5\right)$

Wherein for expense computational algorithm.This algorithm input electricity consumption total amount output expense C.

The present invention is to have the computational tool of privacy protection function---and homomorphic cryptography is basis.In-individual additive homomorphism algorithm, two ciphertexts and equal expressly corresponding and ciphertext.Homomorphic cryptography algorithm is by following four Algorithm constitutions:

1) secret key produces algorithm: a security parameter 1 of this algorithm input ^k, export a public affairs-private key to KG (1 ^k) → (SK, PK).

Wherein KG (1 ^k) be that secret key produces algorithm.A security parameter 1 of this algorithm input ^k, output public private key pair (SK, PK).

2) cryptographic algorithm: a ciphertext M of this algorithm input _iwith PKI PK, export a ciphertext CT _i=HE (M _i, PK), i=1,2 ..., N.Wherein HE (M _i, PK) and be the cryptographic algorithm of a homomorphic cryptography.This algorithm input PKI PK and plaintext M _i, output ciphertext CT _{{ i}}.

3) assignment algorithm: this algorithm is inputted one group of ciphertext CT _i=HE (M _i, PK), output

Wherein CT _ifor ciphertext M _i, CT is expressly ciphertext.

4) decipherment algorithm: this algorithm is inputted secret key SK and ciphertext CT, output expressly the decipherment algorithm that wherein HD (SK, CT) is homomorphic cryptography.This algorithm input private key SK and ciphertext CT, output is expressly corresponding

In the present invention, there are three entities: user, Utilities Electric Co. and polymerizer.Suppose that polymerizer is a honest entity, be responsible for calculating the electric weight that user consumes, electric weight company is according to being related to that Cost (.) carrys out computational costs, and in the time period, intelligent electric meter records electric quantity consumption situation N time.User is according to consumed electric weight payment.Polymerizer is responsible for the information fusion from same user, and the sum of user's consumes power is reported to Utilities Electric Co..The intelligent electric meter electric weight P that recording user uses in real time _i, the data CT of the method scrambled record of use homomorphic cryptography _i=HE (P _i, PK), then ciphertext is sent to polymerizer.After a time period, polymerizer sues for peace the ciphertext of power consumption by what collect about some users $\mathrm{CT}={\mathrm{\Σ}}_{I=1}^N{\mathrm{CT}}_I={\mathrm{\Σ}}_{I=1}^N\mathrm{HE}(P_l,\mathrm{ID},\mathrm{RK})=\mathrm{HE}({\mathrm{\Σ}}_{I=1}^N{P}_l,\mathrm{RK}),$ Then decrypting ciphertext HD (SK, CT), obtains expressly this plaintext is user makes power consumption summation in this time period.This user's electric weight summation is sent to Utilities Electric Co. by polymerizer, and Utilities Electric Co. calculates user's electricity cost

Claims (2)

1. a charging method in intelligent grid with secret protection, is characterized in that: the electric weight that the method is used by intelligent electric meter real time record user, adopts the data of the method scrambled record of homomorphic cryptography, and ciphertext is sent to polymerizer; After a time period, polymerizer sues for peace the ciphertext of power consumption by what collect about certain user; Then decrypting ciphertext, obtains user and makes in this time period the plaintext of power consumption summation; This plaintext is sent to charging department by last polymerizer, and charging department calculates this user's electricity cost; Concrete steps are as follows:

1) initial phase: suppose 1 ^kbe a security parameter, polymerizer produces the public affairs-private key pair of homomorphic cryptography:

KG(1 ^k)→(SK，PK) (1)

Wherein KG (1 ^k) be that secret key produces algorithm; A security parameter 1 of this algorithm input ^k, output public private key pair (SK, RK);

2) data fetch phase: intelligent electric meter reads the electric weight P that user consumes in real time _i, and it is carried out to homomorphic cryptography:

CT _{i}＝HE(P _i，PK)，i＝1，2，...，N (2)

Wherein HE (P _i, PK) and be the cryptographic algorithm of homomorphic cryptography, the electric weight P that this algorithm input PKI PK and user consume _i, output ciphertext CT _{{ i}}, intelligent electric meter is by CT _{{ i}}send to polymerizer;

3) the data aggregate stage: after a time period, polymerizer makes the ciphertext summation of power consumption to certain user:

$\mathrm{CT}={\mathrm{\Σ}}_{i=1}^N{\mathrm{CT}}_i={\mathrm{\Σ}}_{I=1}^N\mathrm{HE}(P_i,\mathrm{ID},\mathrm{RK})=\mathrm{HE}({\mathrm{\Σ}}_{I=1}^N{P}_i,\mathrm{RK})---\left(3\right)$

Wherein CT _ifor user is in the ciphertext of moment i consumes power, CT is expressly ciphertext; Then polymerizer decrypting ciphertext:

$\mathrm{HD}(\mathrm{SK},\mathrm{CT})={\mathrm{\Σ}}_{I=1}^N{P}_i---\left(4\right)$

The decipherment algorithm that wherein HD (SK, CT) is homomorphic cryptography; This algorithm input private key SK and ciphertext CT, output is expressly corresponding

Last polymerizer is by this user's electric quantity consumption summation send to charging department;

4) the paying stage: the expense that Utilities Electric Co. calculates this user is:

$C=\mathrm{CostCompt}\left({\mathrm{\Σ}}_{i=1}^N{P}_i\right)---\left(5\right)$

Wherein for expense computational algorithm, this algorithm input electricity consumption total amount output expense C.

2. the charging method in intelligent grid according to claim 1 with secret protection, is characterized in that: to have the computational tool of privacy protection function, homomorphic cryptography is basis; In an additive homomorphism algorithm, two ciphertexts and equal corresponding expressly and ciphertext; Homomorphic cryptography algorithm is by following four Algorithm constitutions:

1) secret key produces algorithm: a security parameter k of this algorithm input, exports a public affairs-private key to KG (1 ^k) → (SK, PK);

2) cryptographic algorithm: a ciphertext M of this algorithm input _iwith PKI PK, export a ciphertext CT _i=HE (M _i, PK), i=1,2 ..., N;

3) assignment algorithm: this algorithm is inputted one group of ciphertext CT _i=HE (M _i, PK), output

4) decipherment algorithm: this algorithm is inputted secret key SK and ciphertext CT, output expressly