CN111680331B

CN111680331B - System and method for managing length-checking mailbox based on block chain

Info

Publication number: CN111680331B
Application number: CN202010468604.4A
Authority: CN
Inventors: 徐兰天; 李荣华; 王国仁; 金福生; 张志威
Original assignee: Beijing Institute of Technology BIT
Current assignee: Beijing Institute of Technology BIT
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2023-02-28
Anticipated expiration: 2040-05-28
Also published as: CN111680331A

Abstract

The invention discloses a block chain-based school leader mailbox management system and a block chain-based school leader mailbox management method. When a certain student in the ring needs to sign the reported information, the private key of the student and the public keys of other teacher and student nodes in the ring are used for executing a ring signature algorithm on the information to obtain a signature, and then the information and the signature are sent to the school. The school uses the public keys of all teacher and student nodes in the ring to verify the information. The public keys of all teacher and student nodes in the ring are used when the school checks the signature, so that the school does not know that the signature is generated by the private key of which teacher and student node in the ring, but can ensure that the signature is generated by a certain teacher and student node in the ring. The system is convenient for authenticating the identity of the participant, and complete anonymity is realized by adopting the ring signature; all reporting and replying activities are recorded on the chain and can be checked, so that the data cannot be tampered.

Description

System and method for managing length-checking mailbox based on block chain

Technical Field

The invention relates to the technical field of block chains and intelligent contracts, in particular to a system and a method for managing a school leader mailbox based on the block chains.

Background

The school master mailbox provides the functions of teachers and students in the whole school to publish suggestions, opinions, consultations and complaints on the platform, and the functions of replying, evaluating and the like of relevant departments can be provided. The school leader mailbox builds a fast and convenient bridge for widely opening the way, strengthening communication and treating schools by democratics, can promote schools to actively implement school affair disclosure on the internet, enables teachers and students to timely know important matters of school construction and development, actively strengthens the contact with the teachers and students, obtains understanding and support of the teachers and students on school reform and development, and strengthens the cohesion and the centripetal force of schools.

The existing chief mailbox of some colleges and universities is simple, and only a mailbox address is disclosed on the Internet for students to send mails to the address to reflect the situation. In the mode, only a chief mailbox for disclosing a mailbox address is too simple, whether feedback and reaction speed are actually given or not cannot be known, and the chief mailbox is low in efficiency, lack of supervision, not transparent enough to be published and not strong in public trust.

Some college post boxes of the colleges are made into a network platform, and all classmates can see opinions of other people and replies of the colleges. The platform discloses the presenter of each opinion to all persons, the presenting time, the opinion content, the reply time and the reply content of the school. Other classmates may also evaluate the responses made by schools. This approach, however, also suffers from the disadvantage that it is not anonymous, and some reporters do not want to be able to find their true identity, and the network platform does not support this functionality; secondly, centralization, the control right of the whole network platform is in the school, students only have the use right, and the control party of the school can modify data arbitrarily.

Patent document publication No. CN110213251A, entitled anonymous reporting reward issuing method and getting method, device and storage medium, discloses a method and device for solving the problems of anonymous reporting and ensuring that the anonymous reporter does not expose identity in the link of getting reward.

However, how to realize the management of the school leader mailbox by adopting centralized data storage and combining with a block chain technology is the problem to be solved by the invention, namely the method can be applied to the application scenes that students propose to school leaders and that school leaders feed back to students and the like.

Disclosure of Invention

The invention aims to allow the anonymous suggestion to be sent out for the protection of an opinion submitting or reporting person based on the characteristics that a block chain cannot be forged, is marked in the whole process, can be traced, is open and transparent and is maintained collectively. Therefore, the system and the method for managing the campus mailbox based on the blockchain are provided.

In a first aspect, an embodiment of the present invention provides a system for managing a campus mailbox based on a block chain, where the system includes:

the registration authentication module is used for taking a school end as a verifier and adding the school end into the block chain school master mailbox management system after verification according to the relevant information of teachers and students; a pair of ring public and private keys is randomly generated by the system, wherein the ring public key is Pa, and the ring private key is Pb; the ring public key Pa is disclosed to ring members and a verifier, and the ring private key Pb is stored by a teacher and a student;

the suggestion proposing module is used for the school end to generate a pair of public and private keys, the public key Sa is published in a chaining mode, and the private key Sb is stored; the reporter at the teacher end writes the opinions into information M; when the reporter at the teacher's live end selects an encryption mode, a pair of secret keys, a public key Ra and a private key Rb, are generated by the reporter; encrypting the information M and the public key Ra by using a public key Sa of a school end to obtain M';

the reporter uses the ring private key Pb of the reporter and the ring public key Pa of other members in the ring to execute ring signature to obtain a signature; sending the information and the signature to a verifier; after receiving the information and the signature, the verifier verifies the signature on the information by using the ring public keys Pa of all members in the ring; if the information is in an encryption mode M ', the school end decrypts M' by using a private key Sb of the school end to obtain original information M and a public key Ra generated by a reporter;

the solution feedback module is used for the school end to reply the information M according to the information M and publish the M uplink; when the school end adopts the encryption reply, the public key Ra of the reporter is used for encrypting m to obtain information m'; linking m' to the upper chain, only the reporter is visible; in the encrypted reply mode, the reporter at the teacher's end decrypts m ' by using the private key Rb ' of the reporter, and obtains reply information m at the school end.

Further, the registration authentication module includes:

the registration application unit is used for submitting personal information to a school by teachers and students and initiating application registration to the school;

the information verification unit is used for verifying the identity of the school terminal according to the application registration initiated by the teacher terminal;

the system registration unit is used for registering ring members in the system for teachers and students who pass the verification according to the intelligent contract and randomly generating a pair of ring public and private keys, wherein the public key is Pa and the private key is Pb;

the public key unit of the public ring, is used for making public key Pa of each teacher's and students end up to the member of the ring and verifying the square public;

and the private key storage unit is used for obtaining the ring private key Pb of the teacher-student account after the teacher-student registration is successful.

Further, the opinion suggestion module includes:

the school public and private key generation unit is used for generating a pair of public and private keys at a school end, publishing the public key Sa in a chaining mode, and storing the private key Sb;

the opinion proposing unit is used for writing the opinion into information M by the reporter at the teacher end, and executing ring signature to obtain a signature by using a private key Pb of the reporter and a public key Pa of other members in the ring;

when the reporter selects an encryption mode, a pair of secret keys, a public key Ra and a private key Rb, are generated by the reporter; writing the opinions into information M and encrypting the public key Ra by using a public key Sa of a school end to obtain M'; using the private key Pb of the reporter and the public keys Pa of other members in the ring to encrypt M' again by using the ring signature;

the report information publishing unit is used for publishing the information M of the reporter in the system;

the opinion reading unit is used for verifying and signing the information M by using the public keys Pa of all members in the ring after the verifier receives the information M and the signature; after receiving the information M ', the school end decrypts M' by using its private key Sb to obtain the original information M and the public key Ra generated by the reporter.

Further, the system further comprises:

the solution evaluation module is used for initiating a voting application by a school end; voting by teachers and students voting by the teacher and student terminals by adopting ring signatures and blind signatures according to the voting theme; the relevant information of the voting is linked up and stored; the intelligent contract publicizes the voting information and the statistical data.

Further, the solution evaluation module includes:

the system comprises an initiating voting unit, a receiving unit and a sending unit, wherein the initiating voting unit is used for a school end to determine a voting subject and a voting option and randomly generate a blind public key Ta and a blind private key Tb;

the topic disclosing unit is used for verifying the uniqueness of the voting topic on the block chain and publishing the voting topic and the blind public key Ta;

the voting ID blinding unit is used for generating a blinding factor and a voting ID at random by a teacher and a student to be voted, blinding the voting ID by using the blinding factor and the blinding public key Ta to obtain an MID, and submitting the MID to uplink;

a voting ID verification unit for verifying the uniqueness of the MID;

the blind signature unit is used for acquiring MIDs of all voters from the chain by a school end, signing the MIDs by using a blind private key Tb to obtain a blind signature SID, and publishing the blind signature SID to all voters on the chain;

the teacher-student voting unit is used for acquiring the self blind signature SID of the teacher and the student from the chain by the teacher-student end, and performing blinding removal processing on the SID by using the self blind factor to obtain a signature S of the school ID; using the ring private key Pb of the user and the ring public keys Pa of all other ring members to carry out ring signature P on the voting information and the voting ID; linking up the voting information, the voting ID, the signature S and the ring signature P;

and the verification and statistics module is used for verifying the signature S by using a blind public key Ta of the school end for the intelligent contract on the block chain, verifying the ring signature P by using the ring public keys Pa of all ring members, and disclosing the voting information and the statistical data thereof.

In a second aspect, the present invention further provides a management method for a leader mailbox based on a blockchain, where the management system for a leader mailbox based on a blockchain according to any of the above embodiments includes:

a registration authentication step, in which a school terminal is used as a verifier, and the school terminal is added into a block chain school length mailbox management system after verification according to the relevant information of teachers and students; a pair of ring public and private keys is randomly generated by the system, wherein the ring public key is Pa, and the ring private key is Pb; the ring public key Pa is disclosed to ring members and a verifier, and the ring private key Pb is stored by a teacher and a student;

an opinion proposing step, which is used for the school end to generate a pair of public and private keys, the public key Sa is published in a chain mode, and the private key Sb is stored; the reporter at the teacher and the student writes the opinions into information M; when the reporter at the teacher's live end selects the encryption mode, a pair of secret keys, a public key Ra and a private key Rb, are generated by the reporter; encrypting the information M and the public key Ra by using a public key Sa of a school end to obtain M';

the reporter uses the ring private key Pb of the reporter and the ring public keys Pa of other members in the ring to execute ring signature to obtain a signature; sending the information and the signature to a verifier; after receiving the information and the signature, the verifier verifies the signature on the information by using the ring public keys Pa of all members in the ring; if the information is in an encryption mode M ', the school end decrypts M' by using a private key Sb of the school end to obtain original information M and a public key Ra generated by a reporter;

the solution feedback step is used for the school end to reply the information M according to the information M and publish the M uplink; when the school end adopts the encryption reply, the public key Ra of the reporter is used for encrypting m to obtain information m'; linking m' to the upper chain, only the reporter is visible; in the encrypted reply mode, the reporter at the teacher's end decrypts m ' by using the private key Rb ' of the reporter, and obtains reply information m at the school end.

Further, the step of registration authentication includes:

the teachers and students submit personal information through the teachers and students end and initiate application and registration to schools;

the school terminal verifies the identity according to the application registration initiated by the teacher and student terminal;

registering teachers and students who pass the verification in the system according to the intelligent contract, and randomly generating a pair of ring public and private keys, wherein the public key is Pa and the private key is Pb;

public keys Pa of each teacher and student end are disclosed to the ring members and the verification party;

and when the teacher and the student register successfully, obtaining the ring private key Pb of the teacher and the student in the account of the teacher and the student.

Further, the opinion proposing step includes:

the school terminal generates a pair of public and private keys, the public key Sa is published in a cochain mode, and the private key Sb is stored;

the reporter at the teacher's and student end writes the opinions into information M, and executes ring signature to obtain a signature by using a private key Pb of the reporter and a public key Pa of other members in the ring;

when the reporter selects an encryption mode, a pair of secret keys, a public key Ra and a private key Rb are generated by the reporter; writing the opinions into information M and encrypting the public key Ra by using a public key Sa of a school end to obtain M'; using the private key Pb of the reporter and the public keys Pa of other members in the ring to encrypt M' again by using the ring signature;

the information M of the reporter is published in the system;

after receiving the information M and the signature, the verifier verifies the signature of the information M by using the public keys Pa of all members in the ring; after receiving the information M ', the school end decrypts M' with its own private key Sb to obtain the original information M and the public key Ra generated by the reporter.

Further, the method further comprises:

the solution evaluation step, the school terminal initiates a voting application; voting by teachers and students voting by the teacher and student terminals by adopting ring signatures and blind signatures according to the voting theme; the relevant information of the voting is linked up and stored; the intelligent contract publicizes the voting information and the statistical data.

Further, the solution evaluation step includes:

the school terminal determines the voting subject and the voting options and randomly generates a blind public key Ta and a blind private key Tb;

verifying the uniqueness of the voting theme on the block chain, and publishing the voting theme and the blind public key Ta;

randomly generating a blind factor and a voting ID by a teacher end to be voted, blinding the voting ID by using the blind factor and the blind public key Ta to obtain an MID, and submitting the MID to an uplink;

checking the uniqueness of the MID;

the school end acquires MIDs of all voters from the chain, signs the MIDs by using a blind private key Tb to obtain a blind signature SID, and publishes the blind signature SID to all voters on the chain;

the teacher and student end obtains the self blind signature SID of the teacher and student from the chain, and blindness removal processing is carried out on the SID by using the self blind factor to obtain a signature S of a school proofreading ID; using the ring private key Pb of the user and the ring public keys Pa of all other ring members to carry out ring signature P on the voting information and the voting ID; linking up the voting information, the voting ID, the signature S and the ring signature P;

the intelligent contract on the block chain uses a blind public key Ta of a school end to check the signature S, and uses ring public keys Pa of all ring members to check the ring signature P, and the voting information and the statistical data thereof are disclosed.

The management system of the block chain-based chief mailbox provided by the invention has the advantages that under the condition of complete anonymity, other people except the reporter himself can not determine who the real reporter is under the condition of using the ring signature. All teacher and student nodes in the system form a ring, and the public key of each person is disclosed to ring members and schools. When a certain student in the ring needs to sign the reported information, the private key of the student and the public keys of other teacher and student nodes in the ring are used for executing a ring signature algorithm on the information to obtain a signature, and then the information and the signature are sent to the school. After receiving the information and the signature, the school verifies the information by using the public keys of all teacher and student nodes in the ring. The public keys of all teacher and student nodes in the ring are used when the school checks the signature, so that the school does not know that the signature is generated by the private key of which teacher and student node in the ring, but can ensure that the signature is generated by a certain teacher and student node in the ring. The system is oriented to teachers and students of the whole school, and is convenient for authenticating all votes and reporting the identities of participants of the activities; chaining the reported content, and enabling the school to publicly reply the reported content; and the property of the alliance chain determines all reports in the system, and the reply activities are recorded on the chain and can be checked, so that the data cannot be tampered.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a block diagram of a system for managing a campus mailbox based on a blockchain according to an embodiment of the present invention;

fig. 2 is a block diagram of a registration authentication module according to an embodiment of the present invention;

fig. 3 is a timing diagram executed by the registration authentication module according to an embodiment of the present invention;

FIG. 4 is a block diagram of an opinion suggestion module according to an embodiment of the present invention;

FIG. 5 is a timing diagram of the execution of the opinion providing module according to the embodiment of the present invention;

FIG. 6 is a timing diagram illustrating the implementation of a solution feedback module according to an embodiment of the present invention;

FIG. 7 is a block diagram of a solution evaluation module provided by an embodiment of the invention;

fig. 8 is a timing diagram of the solution evaluation module according to the embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Since the general reporting objects are colleagues or leaders, the reporters are afraid of being attacked and will often adopt an anonymous mode. If the school master mailbox cannot be anonymous, some teachers and students cast mouse repellers, do not want to reflect the situation, and are not favorable for improving the management level of schools. In addition, the management of schools requires the common effort of teachers and students, and the operation control right should not be completely put into the hands of schools. Therefore, the invention can adopt a mode of allowing anonymous report reporting and realize public supervision on the decentralized chief mailbox platform by combining with the block chain technology, thereby achieving the purpose that the public can know that the data of the report information is falsified and forged.

The invention relates to a plurality of bodies, comprising: schools, teachers and students (ring members), reporters in teachers and students and responders in schools. School as the verification party of the alliance chain (such as the educational administration system of school); teachers and students have registration in a school leader mailbox system; the reporter can anonymously report information to the school according to the intelligent contract; the replying person of the school student can reply the report information according to the intelligent contract; the nature of the alliance chain determines that all activities in the system will uplink records, ensuring data is not tampered. The invention relates to a management system of a school leader mailbox based on a block chain, in particular to a school account client, a teacher account client and an intelligent contract server. For convenience of description and explanation, the school account client is simplified into a school or a verification party, and the teacher and student account client is simplified into a teacher and a student.

An embodiment of the present invention provides a management system for a leader mailbox based on a block chain, which is shown in fig. 1 and includes:

the registration authentication module 100 is used for taking a school end as a verifier, and adding the school end into the block chain school leader mailbox management system after verification according to the relevant information of teachers and students; a pair of ring public and private keys is randomly generated by the system, wherein the ring public key is Pa, and the ring private key is Pb; the ring public key Pa is disclosed to ring members and a verifier, and the ring private key Pb is stored by a teacher and a student;

the opinion proposing module 200 is used for writing the opinion into information M by the reporter at the teacher's end, and executing a ring signature to obtain a signature by using a private key Pb of the reporter and a public key Pa of other members in the ring; sending the information M and the signature to a verifier; after receiving the information M and the signature, the verifier verifies the signature of the information M by using the public keys Pa of all members in the ring;

the solution feedback module 300 is used for the school end to reply the message M according to the message M and publish the M uplink; when the school end adopts the encryption reply, the public key Ra of the reporter is used for encrypting m to obtain information m'; linking m' to the upper chain, only the reporter is visible; in the encrypted reply mode, the reporter at the teacher's end decrypts m ' by using the private key Rb ' of the reporter, and obtains reply information m at the school end.

In this embodiment, in the management system of the length-correcting mailbox based on the block chain, the block chain is a federation chain, the number and the source of network nodes are not limited, and an intelligent contract technology is adopted, where the intelligent contract at least includes the following functions:

a) The management system issues intelligent contracts on the alliance chain;

b) After the intelligent contract is issued, the correspondingly generated public keys can be published on the blockchain, and the reported information and the replied information are published.

Since the blockchain data is disclosed to nodes in the blockchain network after uplink, an asymmetric encryption algorithm may be used in order to achieve secure communication. Asymmetric encryption algorithms require two keys: a public key and a private key. The public key and the private key are a pair, and if data is encrypted with the public key, only the corresponding private key can be used for decryption. The confidentiality of the asymmetric encryption algorithm is good, and the requirement of exchanging keys by an end user is eliminated; meanwhile, the ring signature ensures that the identity of the voter is legal and anonymous.

Wherein: the master and the student are oriented to the master and the student, and the registration authentication module can authenticate all votes and report the identities of the participants of the activities.

All teacher and student nodes in the system form a ring, and the public key of each person is disclosed to ring members and schools. When a certain student in the ring needs to sign the reported information, the private key of the student and the public keys of other teacher and student nodes in the ring are used for executing a ring signature algorithm on the information to obtain a signature, and then the information and the signature are sent to the school. After receiving the information and the signature, the school verifies the information by using the public keys of all teacher and student nodes in the ring. The public keys of all teacher and student nodes in the ring are used when the school checks the signature, so that the school does not know that the signature is generated by the private key of which teacher and student node in the ring, but can ensure that the signature is generated by a certain teacher and student node in the ring. The system is oriented to teachers and students of the whole school, and is convenient for authenticating all votes and reporting the identities of participants of the activities; chaining the reported content, and enabling the school to publicly reply the reported content; and the property of the alliance chain determines all reports in the system, and the reply activities are recorded on the chain and can be checked, so that the data cannot be tampered.

Further, referring to fig. 2, the registration authentication module includes:

a registration application unit 201, configured to submit personal information through a teacher end and a student end, and initiate application registration to a school;

the information verification unit 202 is used for verifying the identity of the school terminal according to the application registration initiated by the teacher terminal;

the system registration unit 203 is used for registering ring members in the system for teachers and students who pass the verification according to the intelligent contract and randomly generating a pair of ring public and private keys, wherein the public key is Pa and the private key is Pb;

a publish ring public key unit 204, configured to publish a public key Pa of each teacher's and student's end to a ring member and a verifier;

and the private key saving unit 205 is used for obtaining the ring private key Pb of the teacher-student account after the teacher-student registration is successful.

In this embodiment, for example, the school educational administration system is used as a verifier, and students provide personal basic information such as school numbers and names; or the teacher can provide personal information such as name, work number and the like; and after verification, adding the information into a block chain length mailbox management system. When each teacher and student registers, the system randomly generates a pair of ring public and private keys (a public key Pa and a private key Pb), the public key is disclosed to ring members and verifiers, and the private key is stored by the students.

Referring to fig. 3, a timing diagram of the execution of the registration authentication module; take students as an example to explain:

3.1 A registration application: the students submit personal information such as school numbers, names and the like, and apply for the personal information to schools;

3.2 Information verification: the school verifies the identity of the student according to the information submitted by the student;

3.3 System registration): registering ring members for the verified students in the system, and randomly generating a pair of ring public and private keys for each student;

3.4 Publish ring public key: publishing the ring public key of each student after the students successfully register;

3.5 Store personal private key: after the student successfully registers, the student obtains the own ring private key.

The school is used as a verification party of the alliance chain, and the student is registered in the school chief mailbox according to personal information such as the student number. The master and the student are oriented to the master and the student, so that the identity of all participants of voting and reporting activities can be authenticated conveniently.

In one embodiment, the opinion providing module, as shown in fig. 4, includes:

a school public and private key generating unit 401, configured to generate a pair of public and private keys at a school end, publish the public key Sa in a chaining manner, and store the private key Sb;

an opinion proposing unit 402, which is used for the reporter at the teacher's end to write the opinion into information M, and execute ring signature to obtain a signature by using the private key Pb of the reporter and the public keys Pa of other members in the ring;

when the reporter selects an encryption mode, a pair of secret keys, a public key Ra and a private key Rb are generated by the reporter; writing the opinions into information M and encrypting the information M and the public key Ra by using a public key Sa of a school end to obtain M'; using the private key Pb of the reporter and the public keys Pa of other members in the ring to encrypt M' again by using the ring signature;

a report information publishing unit 403, configured to publish the information M of the reporter in the system;

a reading opinion unit 404, configured to, after receiving the information M and the signature, the verifier verifies the signature on the information M using the public keys Pa of all members in the ring; after receiving the information M ', the school end decrypts M' with its own private key Sb to obtain the original information M and the public key Ra generated by the reporter.

In this embodiment, the school discloses the public key of the school in advance, and the private key is stored by the school.

The reporter writes the opinion as information M. If the reporter selects an encryption mode, a pair of secret keys (a public key Ra and a private key Rb) are generated by the reporter, and the information M and the newly generated public key Ra are encrypted by the public key Ra of the school to obtain M'; otherwise, skipping the step.

The reporter uses the private key Pb of the reporter and the public key Pa of other members in the ring to execute a ring signature algorithm on the information (the encryption mode is M', and the encryption mode is M) to obtain a signature, and then the information and the signature are sent to the verifier. After receiving the information and the signature, the school checks the signature on the information by using the public keys Pa of all members in the ring. If the information is in an encryption mode M ', the school decrypts M' by using a private key of the school to obtain the original information M and a public key Ra generated by the reporter.

Referring to FIG. 5, a timing diagram for the implementation of the opinion suggestion module is shown; take students as an example to explain:

5.1 School public and private keys: school generates a pair of public and private keys (public key Sa and private key Sb), and the private key is stored by school;

5.2 School public key publication: publishing the public key Sa on the chain;

5.3 Opinion processing: the student generates a pair of public and private keys (a public key Ra and a private key Rb), combines the reported information and the public key, encrypts the reported information and the public key into a ciphertext M' by using a school public key Sa, and encrypts the ciphertext again by using a ring signature;

5.4 Report information publication: publishing the report information in the system;

5.5 Read comments: after the school passes the ring signature authentication, the cipher text is decrypted by using a school private key to obtain the reporting information and a student public key Ra.

In the time sequence chart, the school publishes a public key of the school in advance, and the reporting person encrypts reporting content of the reporting person by using the public key and then publishes the reporting content to a chain, so that the reporting content can be checked only by the school with a private key. The ring signature ensures the identity of the voter to be legal and anonymous; for the condition that some reported contents are not convenient for others to know, the system can realize encrypted communication between the reported person and the school, so that the reported contents can not be viewed by others even though the chain is linked.

In one embodiment, the solution feedback module is configured to reply, by the school end, a message M according to the message M, and publish the M uplink; when the school end adopts the encryption reply, the public key Ra of the reporter is used for encrypting m to obtain information m'; winding up m' and only reporting the chain; in the encrypted reply mode, the reporter at the teacher's end decrypts m ' by using the private key Rb ' of the reporter, and obtains reply information m at the school end.

In this embodiment, after the student finishes proposing the opinions, the school reply message is m. The encrypted reply and the unencrypted reply can be determined according to actual conditions (namely, only the reporter can be seen and all students can be seen). If the encryption reply is adopted, the public key Ra of the reporter is used for encrypting m to obtain information m ', and m' is uplinked to ensure that only the reporter is visible; otherwise, the m is directly linked.

In the encrypted reply mode, the reporter decrypts m' by using the private key Rb to obtain the reply information m of the school.

Referring to FIG. 6, a timing diagram for the implementation of the feedback module is shown; take students as an example to explain:

6.1 Reply information processing: after the school finishes replying the information, encrypting the information by using a public key Ra of the student to obtain a ciphertext;

6.2 Reply message publication: publishing the reply message in the system;

6.3 Opinion processing: the student decrypts the ciphertext by using the private key Rb to obtain the reply information of the school.

In this embodiment, the system implements an intelligent contract, and the school can reply the report with or without encryption after receiving the report.

In one embodiment, referring to fig. 1, the system further includes a solution evaluation module, configured to initiate a voting application at a school end; voting by teachers and students voting by the teacher and student terminals by adopting ring signatures and blind signatures according to the voting theme; the relevant information of the voting is uplink stored; the intelligent contract publicizes the voting information and the statistical data.

Referring to fig. 7, the solution evaluation module includes:

the initiating voting unit 701 is used for a school end to determine voting subjects and voting options and randomly generate a blind public key Ta and a blind private key Tb;

a topic disclosing unit 702, configured to verify uniqueness of the voting topic on the block chain, and publish the voting topic and the blind public key Ta;

the voting ID blinding unit 703 is used for generating a blinding factor and a voting ID at random by a teacher and a student to be voted, blinding the voting ID by using the blinding factor and the blinding public key Ta to obtain an MID, and submitting the MID to uplink;

a vote ID verifying unit 704 for verifying the uniqueness of the MID;

the blind signature unit 705 is used for the school end to obtain the MIDs of all the voters from the chain, sign the MIDs by using a blind private key Tb to obtain a blind signature SID, and publish the blind signature SID to all the voters on the chain;

the teacher-student voting unit 706 is used for the teacher end to acquire the self blind signature SID of the teacher and the student from the chain, and the self blind factor is used for carrying out blinding removal processing on the SID to obtain a signature S of the school ID; using a ring private key Pb of the user and ring public keys Pa of all other ring members to carry out ring signature P on the voting information and the voting ID; linking up the voting information, the voting ID, the signature S and the ring signature P;

and the verification and statistics unit 707 is used for verifying the signature S by using the blind public key Ta of the school end for the intelligent contract on the block chain, verifying the ring signature P by using the ring public keys Pa of all ring members, and disclosing voting information and statistical data thereof.

In this embodiment, after the opinion feedback is solved, a school initiates a voting application, determines information such as a voting theme and voting options, and randomly generates a blind public key Ta and a blind private key Tb.

The uniqueness of the voting subject is verified on the blockchain, and the school publishes the voting subject and the blind public key Ta.

The method comprises the steps that students who want to vote acquire a voting theme and a blind public key Ta, the students randomly generate blind factors and voting IDs, the voting IDs are blinded by the blind factors and the blind public key Ta to obtain MIDs, and the students submit the MIDs to a chain to check the uniqueness of the MIDs.

The school acquires MIDs of all voters from the chain, signs the MIDs by using a blind private key Tb to obtain a blind signature SID, and publishes the blind signature SID to all voters.

And the student acquires the blind signature SID signed by the MID from the chain, and blindness removal processing is carried out on the SID by using a blind factor of the student to obtain a signature S of the learning and proofreading ID. After the student decides voting options and evaluation contents, a ring signature P is made on voting information and voting ID by using a ring private key Pb of the student and ring public keys Pa of all other ring members, and the voting information, the voting ID, the signature S and the ring signature P are linked.

The intelligent contract on the blockchain verifies the signature S with the school' S blind public key Ta and the ring public keys of all ring members. When the voting ID is ensured to be unique, the intelligent contract publicizes the voting information and the statistical data thereof.

Referring to FIG. 8, a timing diagram for the evaluation module execution is shown; take students as an example to explain:

8.1 Initiate a vote): determining voting subjects, voting options and other information, and randomly generating a blind public key Ta and a blind private key Tb;

8.2 Subject publicity: verifying the uniqueness of the voting theme, and disclosing the voting theme and the blind public key Ta;

8.3 Vote ID blinding: randomly generating a blind factor and a voting ID, and blinding the voting ID by using the blind factor and a blind public key Ta to obtain an MID;

8.4 Vote ID verification: checking the uniqueness of the MID;

8.5 Blind signature name): acquiring MIDs of all voters, and signing the MIDs by using a blind private key Tb to obtain a blind signature SID;

8.6 Blind signature publication: the blind signature SID is published to all voters;

8.7 Student voting: and acquiring a blind signature SID from the chain, and performing blinding removal processing on the SID by using a blind factor to obtain a signature S of the learning and proofreading ID. Using the ring private key of the user and the ring public keys of all other ring members to make a ring signature P for the voter and the voting ID;

8.8 Voting verification and statistics: and (4) checking the signature S by using a blind public key Ta of the school, checking the ring signature by using the ring public keys of all ring members, and disclosing the voting statistical result.

In this embodiment, all students can evaluate the responses from the school, and all reporting, evaluation, and response activities are recorded on the chain for examination. The management system of the master mailbox ensures that activities such as voting, reporting and the like of teachers and students cannot be tracked under the condition of ensuring identities. Meanwhile, the method has uniqueness, and in order to prevent the condition of ticket swiping, a student can only vote once for a theme.

The management system of the chief mailbox based on the block chain realizes anonymity and decentralization of maintenance of reporting of the chief mailbox. The reporter can choose anonymity and non-anonymity, and the content of the report can choose encryption and non-encryption. Schools may choose to encrypt and not encrypt replies based on the content of the report. Meanwhile, after the study proofreading is carried out on the non-encrypted report, an intelligent contract can be started, and teachers and students are required to comment and score the solution result.

The following advantages are also provided:

1) The nature of the alliance chain determines that all activities in the system can uplink the chain records, so that the data cannot be tampered;

2) The ring signature is used in the system to realize that under the condition of complete anonymity, no other person except the person who reports the newspaper can determine who the real person who reports the newspaper is. All teacher and student nodes in the system form a ring, and the public key of each person is disclosed to ring members and schools. When a certain student in the ring needs to sign the reported information, the private key of the student and the public keys of other teacher and student nodes in the ring are used for executing a ring signature algorithm on the information to obtain a signature, and then the information and the signature are sent to the school. After receiving the information and the signature, the school verifies the information by using the public keys of all teacher and student nodes in the ring. The public keys of all teacher and student nodes in the ring are used when the school checks the signature, so that the school does not know that the signature is generated by the private key of which teacher and student node in the ring, but can ensure that the signature is generated by a certain teacher and student node in the ring.

3) In the system, one person and one ticket are realized by using blind signatures. The school publishes the blind public key when initiating a vote. The student randomly generates a blind factor and a voting ID before voting, and blinding the voting ID by using the blind factor and a blind public key. After receiving the blinding information of the teacher and student nodes, the school signs with a blind private key to obtain a blind signature, and sends the blind signature back to the teacher and student nodes. And the teacher and student nodes perform blindness removal by using the blindness factor to obtain the final signature. This signature is equal to the result of the school signing the vote ID directly. The teacher node publishes the signature and the voting information to the chain, and the one-person-one-ticket can be guaranteed without exposing the identity of the teacher node as long as the uniqueness of the signature is verified.

4) The method mainly applies the block chain, blind signature and ring signature technology, and can be applied to application scenes that students propose to school leaders and that school leaders feed back students and the like.

Based on the same inventive concept, the embodiment of the present invention further provides a management method for a length correction mailbox based on a block chain, and because the principle of the problem solved by the method is similar to that of the management system for the length correction mailbox based on the block chain, the implementation of the method can refer to the implementation of the system, and repeated details are omitted.

An embodiment of the present invention further provides a management method for a leader mailbox based on a block chain, where the management system according to any of the above embodiments is used, and the method includes:

a step of registration authentication, in which a school end is used as a verifier, and the school end is added into a block chain length mailbox management system after verification according to the relevant information of teachers and students; a pair of ring public and private keys is randomly generated by the system, wherein the ring public key is Pa, and the ring private key is Pb; the ring public key Pa is disclosed to ring members and a verifier, and the ring private key Pb is stored by a teacher and a student;

an opinion proposing step, which is used for the school end to generate a pair of public and private keys, the public key Sa is published in a chain mode, and the private key Sb is stored; the reporter at the teacher end writes the opinions into information M; when the reporter at the teacher's live end selects the encryption mode, a pair of secret keys, a public key Ra and a private key Rb, are generated by the reporter; encrypting the information M and the public key Ra by using a public key Sa of a school end to obtain M';

the reporter uses the ring private key Pb of the reporter and the ring public keys Pa of other members in the ring to execute ring signature to obtain a signature; sending the information and the signature to a verifier; after receiving the information and the signature, the verifier verifies the signature by using the ring public keys Pa of all members in the ring; if the information is in an encryption mode M ', the school end decrypts M' by using a private key Sb of the school end to obtain original information M and a public key Ra generated by a reporter;

solving a feedback step, namely replying the information M by the school terminal according to the information M, and publishing the M uplink; when the school end adopts the encryption reply, the public key Ra of the reporter is used for encrypting m to obtain information m'; winding up m' and only reporting the chain; in the encrypted reply mode, the reporter at the teacher's and student's end decrypts m ' by using the private key Rb of the reporter, and obtains the reply information m at the school end.

In one embodiment, the step of registering authentication includes:

the teachers and students submit personal information through the teachers and students, and initiate application registration to schools;

the school terminal verifies the identity according to the application registration initiated by the teacher terminal;

public keys Pa of each teacher and student end are published to the ring members and the verifier;

In one embodiment, the opinion presenting step comprises:

the school terminal generates a pair of public and private keys, the public key Sa is published in a chaining mode, and the private key Sb is stored;

the information M of the reporter is published in the system;

In one embodiment, the method further comprises:

In one embodiment, the solution evaluation step comprises:

the school end determines the voting subject and the voting option and randomly generates a blind public key Ta and a blind private key Tb;

checking the uniqueness of the MID;

the school end acquires the MIDs of all voters from the chain, signs the MIDs by using a blind private key Tb to obtain a blind signature SID, and publishes the blind signature SID to all voters on the chain;

the teacher and student end obtains the self blind signature SID of the teacher and student from the chain, and blindness removal processing is carried out on the SID by using the self blind factor to obtain a signature S of a school proofreading ID; using a ring private key Pb of the user and ring public keys Pa of all other ring members to carry out ring signature P on the voting information and the voting ID; linking up the voting information, the voting ID, the signature S and the ring signature P;

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention as set forth in the appended claims.

Claims

1. A system for managing a campus mailbox based on a blockchain is characterized by comprising:

the registration authentication module is used for taking a school end as a verifier, and adding the school end into the block chain leader mailbox management system after verification according to the relevant information of teachers and students; a pair of ring public and private keys is randomly generated by the system, wherein the ring public key is Pa, and the ring private key is Pb; the ring public key Pa is published to ring members and a verifier, and the ring private key Pb is stored by a teacher and a student;

the suggestion proposing module is used for the school end to generate a pair of public and private keys, the public key Sa is published in a chaining mode, and the private key Sb is stored; the reporter at the teacher and the student writes the opinions into information M; when the reporter at the teacher's live end selects the encryption mode, a pair of secret keys, a public key Ra and a private key Rb, are generated by the reporter; encrypting the information M and the public key Ra by using a public key Sa of a school end to obtain M';

the solution feedback module is used for the school end to reply the information M according to the information M and publish the M uplink; when the school end adopts the encryption reply, the public key Ra of the reporter is used for encrypting m to obtain information m'; winding up m' and only reporting the chain; in the encryption reply mode, the reporter at the teacher end decrypts m' by using the private key Rb of the reporter at the teacher end to obtain reply information m at the school end;

2. The system of claim 1, wherein the registration authentication module comprises:

the information verification unit is used for verifying the identity of the school terminal according to the application registration initiated by the teacher and student terminal;

the public key publishing unit is used for publishing the public key Pa of each student end to the ring members and the verifier;

and the private key storage unit is used for obtaining the own ring private key Pb in the teacher-student account after the teacher-student registration is successful.

3. The system of claim 1, wherein the opinion suggestion module comprises:

when the reporter selects an encryption mode, a pair of secret keys, a public key Ra and a private key Rb, are generated by the reporter; writing the opinions into information M and encrypting the public key Ra with a public key Sa of a school end to obtain M'; using the private key Pb of the reporter and the public keys Pa of other members in the ring to encrypt M' again by using the ring signature;

the reading opinion unit is used for verifying and signing the information M by using the public keys Pa of all members in the ring after the verifier receives the information M and the signature; after receiving the information M ', the school end decrypts M' with its own private key Sb to obtain the original information M and the public key Ra generated by the reporter.

4. The system of claim 1, wherein the solution evaluation module comprises:

the topic publicizing unit is used for verifying the uniqueness of the voting topic on the block chain and publishing the voting topic and the blind public key Ta;

the voting ID blinding unit is used for generating a blinding factor and a voting ID at random by a teacher end to be voted, blinding the voting ID by using the blinding factor and the blind public key Ta to obtain an MID, and submitting the MID to a cochain;

a vote ID verifying unit for verifying the uniqueness of the MID;

the teacher-student voting unit is used for acquiring the self blind signature SID of the teacher and the student from the chain by the teacher-student end, and performing blinding removal processing on the SID by using the self blind factor to obtain a signature S of the school ID; using a ring private key Pb of the user and ring public keys Pa of all other ring members to carry out ring signature P on the voting information and the voting ID; linking up the voting information, the voting ID, the signature S and the ring signature P;

5. A method for managing a blockchain-based captain mailbox, which comprises the steps of:

solving a feedback step, namely replying the information M by the school terminal according to the information M, and publishing the M uplink; when the school end adopts the encryption reply, the public key Ra of the reporter is used for encrypting m to obtain information m'; winding up m' and only reporting the chain; in the encryption reply mode, the reporter at the teacher end decrypts m' by using the private key Rb of the reporter at the teacher end to obtain reply information m at the school end;

6. The method of claim 5, wherein the step of registering authentication comprises:

and when the teacher and the student are successfully registered, obtaining the own ring private key Pb in the teacher and student account.

7. The method of claim 5, wherein said step of proposing an opinion comprises:

when the reporter selects an encryption mode, a pair of secret keys, a public key Ra and a private key Rb, are generated by the reporter; writing the opinions into information M and encrypting the public key Ra with a public key Sa of a school end to obtain M'; using the private key Pb of the reporter and the public key Pa of other members in the ring to encrypt M' again by using the ring signature;

the information M of the reporter is published in the system;

8. The method of claim 5, wherein the solution evaluation step comprises:

checking the uniqueness of the MID;

the intelligent contract on the block chain uses the blind public key Ta of the school end to check the signature S, and uses the ring public keys Pa of all ring members to check the ring signature P, and publicizes the voting information and the statistical data thereof.