CN202424771U - Security service system for electronic contracts - Google Patents
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- CN202424771U CN202424771U CN2011205118266U CN201120511826U CN202424771U CN 202424771 U CN202424771 U CN 202424771U CN 2011205118266 U CN2011205118266 U CN 2011205118266U CN 201120511826 U CN201120511826 U CN 201120511826U CN 202424771 U CN202424771 U CN 202424771U
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Abstract
The utility model discloses a security service system for electronic contracts. The security service system comprises a client side, a service side and a communication channel connecting the two sides, wherein the client side and the service side are respectively connected with a third-party certification authority; the service terminal acquires and stores digital certificate information of contract parties through the third-party certification authority, so as to realize identity validation of the contract parties; and the service side is simultaneously connected with a third-party proof server and a third-party storage server which are independent of each other. According to the utility model, the third-party proof server provides proof service for the original characters of electronic contract texts, so that the electronic contract documents are prevented from falsification, and the transaction process is safer and more reliable accordingly; and the third-party storage server provides long-term storage service and reference service for the electronic contract texts.
Description
Technical field
The utility model relates to the improvement of electronic contract service implementing technology, specifically refers to the electronic contract service system that a kind of fail safe improves greatly, belongs to information security, e-commerce technology field.
Background technology
Along with the development with information technology of popularizing of Internet, replaced traditional mode of doing business gradually based on the electronic business mode of online transaction.Wherein electronic contract is an important ring of electronic transaction.Electronic contract is concluded through computer network system, the contract that generates, stores or transmit with the mode of electronic message." electronic message " means the information that generates, stores or transmit via electronically, optical instrument or similar means, and electronic message includes but not limited to electronic data interchange (EDI), Email, telegram or the information that fax transmitted.
The technology that the electronic contract service that is provided by the third-party institution at present relates to mainly contains electronic signature technology, timestamp technology and digital watermark technology.
Electronic signature technology.At present, the electronic signature that has practical significance has only public key cryptography theoretical.So, the actual both at home and abroad at present digital signature technology that is based on PKI generally that use, technology maturation.As PKIX, PKI can provide multiple internet safe service, like authentication, data security, data integrity and non-repudiation, has wherein all used digital signature technology.The use principle of digital signature is roughly following:
(1) message is obtained a fixedly message digest of figure place by the HASH algorithm computation that both sides arrange.Guarantee that on mathematics as long as change in the message any one, the message digest value that recalculates will not conform to original value.So just guaranteed the unalterable feature of message.
(2) this message digest value is encrypted with sender's private key, send to the recipient together with former message then, and the message that produces is promptly claimed digital signature.
(3) after the recipient receives digital signature, message is calculated digest value, compare with decipher the message digest value of untiing with sender's public-key cryptography then, explain then that as equating message is really from alleged sender with same HASH algorithm.
The timestamp technology.In the e-commerce transaction file, the time is crucial information.In contract in writing, the date of file signature is the same with signature all to be crucial key contents that prevent that file from being forged and distorting.Digital Time-stamp service (DTS:digital time stamp service) is one of online e-commerce security service item, and the safeguard protection of the date and time information of e-file can be provided.The process that timestamp produces is: the file that the user at first adds timestamp with needs forms with the Hash coding encrypting makes a summary; Then this summary is sent to DTS; DTS encrypts (digital signature) to this document again after having added the date and time information of receiving document, send the user then back to.
Digital watermark technology.Be that some identification informations (being digital watermarking) are directly embedded in the middle of the digital carrier (comprising multimedia, document, software etc.), but do not influence the use value of original vector, also be not easy to be perceiveed or notice by people's consciousness system (like vision or auditory system).Be hidden in the information in the carrier through these, can reach and confirm creator of content, buyer, transmission secret information or judge whether carrier purpose such as is distorted.Digital watermarking is a research direction of Information Hiding Techniques.Digital watermark technology is mainly used in the Electronic Seal System of electronic contract service platform.
Concerning the electronic contract both sides, same like papery contract occasion, need to solve the problem of the following aspects, i.e. the 1. true problem of contract the other side's identity; 2. the safety of contract documents is sent to problem; 3. the preservation problem of contract documents; 4. the problem of consulting of contract documents; 5. the anti-tamper problem of contract documents.The electronic contract service system that adopts aforementioned electronic signature, timestamp and digital watermark technology to design can solve contract the other side's the true problem of identity, the safety of contract documents is sent to problem; The short-term problem of preserving and consult that also can solve contract documents (has the electronic contract service system now and does not carry long-term keeping electronic contract document script service function; Only in the database of system itself, preserve the electronic contract document originally; Therefore can only provide short-term to preserve and reference service), but all can't solve the anti-tamper problem of contract documents.The anti-tamper problem of contract documents places one's entire reliance upon the third-party institution of electronic contract service system is provided at present; Though the third-party institution self also can take some measures (comprising technological layer) and prevent that contract from being distorted; But that only is the inner measure of third party; For contract both parties, can not realize effectively control and supervision to the third party service organization from technological layer.
The utility model content
Above-mentioned deficiency to prior art exists makes the more safe and reliable electronic contract service system of process of exchange thereby the purpose of the utility model provides a kind of problem of distorting that can effectively solve contract documents.
The utility model has also solved the long preservation of electronic contract file simultaneously and has consulted problem.
The technical scheme of the utility model is achieved in that a kind of safe electronic contract service system, and this service system comprises client, service end and the communication channel that connects both, and client is used for contract parties's registration and lands; Said client is connected with third party certification authority respectively with service end, and service end obtains and preserve contract parties's digital certificate to realize the identity validation to the contract both sides through third party certification authority; Service end simultaneously proves that with third party independently server is connected, and proves former person's character the witness service of server to the electronic contract text by the third party.
This service system also comprises the independently third party storage server that is used to provide the service of electronic contract text storage, and said third party's storage server is connected with service end.
This service system also comprises the payment services system that is used to provide payment services, and said payment services system is connected with service end.
Said communication channel is the internet, applications interface channel of encrypting, the special VPN passage of setting up or special-purpose interface channel.
The third party proves server to the utility model through setting up independently, prove former person's character the witness service of server to the electronic contract text by the third party, thereby the anti-tamper problem that solves the electronic contract file thus makes process of exchange more safe and reliable.
This service system is provided the long-term storage services and the reference service of electronic contract text through setting up independently third party's storage server by third party's storage server.
Description of drawings
Fig. 1 is the system architecture diagram of the said system of the utility model.
Fig. 2 is the functional block diagram of the said system of the utility model.
Fig. 3 is the system service flow chart of the said system of the utility model.
Fig. 4 is the electronic contract inquiry quotation service procedure figure of the said system of the utility model.
Fig. 5 concludes service procedure figure for the electronic contract of the said system of the utility model.
Fig. 6 is the electronic contract payment services flow chart of the said system of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated.
The utility model relates generally to the main body of four aspects such as contract both parties (being order party-buyer, the side of the accepting and order for goods-seller), service provider and the 3rd service side.Both parties directly get in touch with service provider, provide electronic contract inquiry quotation service, electronic contract to conclude that service, electronic contract payment services, the long-term custodial services of electronic contract document, the former person's character of electronic contract document prove and serve, electronic contract document safety is sent to service, electric signing verification service by service provider to the user.The service system that service provider provides comprises that client C that client software is installed, service end A (server system, cloud platform, group system etc.), the reliable communication channel N that realizes information interaction and stores service third party X and former person's character proof serve third party Y, also has CA/PKI certification authority, bank and other financial mechanism payment services system with this service system interrelates.
The concrete system architecture of the utility model is as shown in Figure 1, is appreciated that according to this figure the utility model provides the integral body of service.Can find out that on scheming the utility model electronic contract service system comprises client, service end and the communication channel that connects both, client is used for contract parties's (being the order party and the side of accepting and order for goods) and registers and land.Said communication channel is the internet, applications interface channel of encrypting, the special VPN passage of setting up or special-purpose interface channel.Said client is connected with third party certification authority respectively with service end, and service end obtains and preserve contract parties's digital certificate to realize the identity validation to the contract both sides through third party certification authority.Service end simultaneously proves that with third party independently server is connected, and proves former person's character the witness service of server to the electronic contract text by the third party.
This service system also comprises the independently third party storage server that is used to provide the service of electronic contract text storage, and said third party's storage server is connected with service end.
This service system also comprises the payment services system that is used to provide payment services (transaction system that provides like bank and other financial mechanism), and said payment services system is connected with service end.
The relation that the native system service function is divided is as shown in Figure 2, can understand service system from view of function according to this figure.System provides following functional module:
User management module U; Be used to realize registration, the registration of user profile; Agreement method for authenticating user identity and necessary satellite information thereof; And the management function of other realization services, mainly comprise submodules such as the user registers, user's renewal, the management of user's service agreement, authenticating user identification, user authority management, according to different classes of user and specific demand the personalized user service is provided;
Electronic contract inquiry quote module Q supports buyer user's (order party) through this platform issue various electronic contract documents relevant with inquiry, collects various electronic contract documents or other information of seller user (side of accepting and order for goods) issue simultaneously; Support seller user (side of accepting and order for goods) to accept these electronics documents through this platform, and through this platform issue various electronic contract documents relevant with appraisal; Mainly comprise submodules such as electronic contract document registration issue, electronic contract document are sent to, message informing;
Electronic contract is concluded module D; Electronic contract is concluded service on the basis of inquiring the price, offering, and final exchange is the electronic contract document of transaction once, and the realization electronic contract is concluded; Order party sends electronic contract documents such as order book and confirmation of order, and native system safety is sent to; The root of accepting and order for goods is confirmed treaty content according to electronic contract documents such as order book and confirmations of order;
Electronic contract payment module T: mainly comprise the registration of advice of charge and attached document; Submodules such as (by third party's financial services) is sent to, paid by mails to advice of charge and attached document.
The former person's character of electronic contract document proves module P, proves the former person's character of electronic contract document, signs constantly from the electronic contract document, and its content does not change.
The electronic contract document is taken care of module M for a long time; Realize long-term, the safekeeping (agreed period or legal time limit) of electronic contract document; Except that taking safety measures, this platform carries out the safe storage; Also carry out back-up storage through third party's stores service, simultaneously for the user provide the electronic contract document inquiry, browse, print service.Mainly comprise submodules such as electronic contract document safekeeping, the inquiry of electronic contract document, electronic contract document are browsed, the printing of electronic contract document, third party's backup.
Encryption and decryption and communication module E; Encrypt sending data from the level of application service; Carry out data and send and receive, and after receiving data, decipher, realize the secret exchange of information between client and the service end; Guarantee that the user uses the electronic data document to prove that the process of serving not by illegal supervision, mainly comprises data encryption module, data decryption module, data transmission blocks, data reception module;
Other modules mainly contain hash function computing, certificate signature, certificate authentication module; Certificate relevant information cryptographic hash is realized signature; Promptly use service provider's private key to encrypt, decipher and call hash function with cryptographic hash value in service provider's PKI cert and relevant information is generated cryptographic hash compare.
Native system provides the implementation pattern of service: electronic contract is a prerequisite with the digital certificate that contract parties's application and acquisition meet Electronic Signature Law; The said electronic contract service system of the utility model solves contract the other side's the true problem of identity through design electric signing verification service module; Send to service module through design contract document safety, solve the safety problem in the contract documents transmission course and send to the affirmation problem; Originally serve (providing) function through carrying long-term keeping electronic contract document, solve the long preservation of contract documents and consult problem by another third party; Through carrying the former person's character proof of electronic contract document service function, solve the anti-tamper problem of electronic contract document.
(1) electronic contract service.Native system provides the electronic contract service, supports the user to realize the ecommerce electronization of (containing other business), specifically is divided into electronic contract inquiry quotation service, electronic contract is concluded service, three kinds of services of electronic contract payment services; Electronic contract inquiry quotation service support buyer user (order party) collects various electronic contract documents or other information of seller user (side of accepting and order for goods) issue simultaneously through this platform issue various electronic contract documents relevant with inquiry; Support seller user (side of accepting and order for goods) to accept these electronics documents through this platform, and through the native system issue various electronic contract documents relevant with appraisal; Electronic contract is concluded service on the basis of inquiring the price, offering, and final exchange is the electronic contract document of transaction once, and the realization electronic contract is concluded; The electronic contract payment services are that two parties realizes that through the third party payment of this transaction provides auxiliary and supports.
(2) electronic contract document safety is sent to service.Native system is sent to service for both parties provide electronic contract document safety, guarantees that quick, the safety of electronic contract document is sent to; Related electronics document is all through the trusted channel encrypted transmission; All kinds of confirmations of sending to below in electronic contract document transmission course, making simultaneously: when accepting the trust request from user's transmission electronic contract document, generate to confirm that accepting commission is the confirmation of sending to of content; When sending the electronic notification of delivering document to the user, generate to confirm to send the confirmation of sending to that this electronic notification is a content; When the user receives the electronic contract document of system's transmission, generate to confirm to be received as the confirmation of sending to of content.Above-mentioned send to confirmation after signing electronically by the platform memory safekeeping, thereby solve in the contract documents transmission course safety problem with send to the affirmation problem.Send to service through electronic contract document safety, can realize electronic contract inquiry quotation, electronic contract conclude the payment with electronic contract.
(3) the originally long-term custodial services of electronic contract document.Native system provides electronic contract document custodial services (agreed period or legal time limit); Provide the electronic contract document inquiry, browse, print service; Through cooperating with third party, realize the backup of electronic contract document by third party's stores service (cloud storage) simultaneously, these data are at first carried out data encryption before the storage; And carry out network code between the different pieces of information group, finally realize electronic contract data backup storage.
(4) the former person's character proof of electronic contract document service.Through cooperate the service of the former person's character proof of native system lift-launch electronic contract document with third party.When promptly the electronic contract document being handled originally for a long time certainly, system logins the former person's character proof of partner's electronic contract document server automatically, obtains electronic contract document registration certificate originally.
(5) electric signing verification service.Native system in time obtains associated user's digital certificate from PKI/CA mechanism, all users' in commendam digital certificate, on behalf of checking user's digital certificate.Digital certificate is a file that comprises public-key cryptography owner information and public-key cryptography through certificate authorization center digital signature.The simplest certificate comprises a public-key cryptography, the digital signature at title and certificate granting center.The effective time that also comprises key generally speaking in the certificate, the title of licence issuing authority (certificate granting center), information such as the sequence number of this certificate, the form of certificate is followed X.509 international standard of ITUT.By the keeping user's of system digital certificate, not only can verify the validity of user's electronic signature effectively, can also alleviate the burden of user oneself keeping counterpart digital certificate.
The concrete service procedure of native system is as shown in Figure 3:
S1: user's registration, submit relevant evidential material to, fill in associated user's data, consult both sides' service contract, realize by user management module; The user is the registration updating data where necessary; Also can directly get into S2 as the user is registered;
S2: according to service contract, the user downloads and installs FTP client FTP (hereinafter all is referred to as client with user's operation interactive system or instrument except that special explanation needs) from service end; As be ready to client, can directly get into S3;
S3: user's login, service end is confirmed user identity;
S4: use the electronic contract inquiry quotation service of native system, need commentaries on classics SA out of service like the user, otherwise repeat S4;
S5: use the electronic contract of native system to conclude service, need commentaries on classics SA out of service, otherwise repeat S5 like the user;
S6: use the electronic contract payment services of native system, need commentaries on classics SA out of service, otherwise repeat S6 like the user;
S7: use the long-term custodial services of electronic contract document of native system,, otherwise repeat S7 like commentaries on classics SA out of service;
S8: use the former person's character proof of the electronic contract document service of native system,, otherwise repeat S8 like commentaries on classics SA out of service;
S9: use the electric signing verification service of native system; ,, otherwise repeat S9 like commentaries on classics SA out of service;
SA: withdraw from service.
Further, the electronic contract of said step S4 inquiry quotation service is as shown in Figure 4, comprises the steps:
S41: the order party user registers entrusting electronic contract documents such as appraisal book, the detailed book of goods specification, uses electronic contract document safety to send to service safe and sends to;
S42: electronic contract documents such as system safety storage order book and confirmation of order
S43: system makes to confirm that accepting commission is the confirmation of sending to of content, returns to order party;
S44: system sends the notification message of electronic contract documents such as entrusting appraisal book, the detailed book of goods specification to the relevant side of accepting and order for goods user;
S45: the square tube of accepting and order for goods is crossed client and is filled in the electronic contract document related pattern information of preparation reception, submits electronic contract document associated safety sign subsidiary in the notification message to;
S46: information such as the secure ID of system verification notification message, valid expiration date, and prompting user; Like the expired notification message that then resends of notification message, use other secure ID instead;
S47: the side of accepting and order for goods downloads the electronic contract document, shows Delivered after download finishes;
S48: the root of accepting and order for goods confirms to entrust content according to electronic contract documents such as entrusting the appraisal book;
S49: the side of accepting and order for goods makes the appraisal book, and sign electronically (carrying out timestamp automatically handles);
S4A: the side of accepting and order for goods uses electronic contract document safety to send to the appraisal written matter folder registration appraisal book/documents such as goods specification detailed book of service at native system;
S4B: electronic contract documents such as system safety storage appraisal book
S4C: system makes to confirm that receiving electronics documents such as evaluating book is the confirmation of sending to of content.
Further, it is as shown in Figure 5 that the electronic contract of said step S5 is concluded service, comprises the steps:
S51: when the order party decision is ordered goods, use electronic contract document safety to send to service and send electronic contract documents such as order book and confirmation of order, and sign electronically;
S52: system makes to confirm that electronic contract documents such as order book and confirmation of order are the confirmation of sending to of content, returns to order party;
S53: electronic contract documents (calling the long-term custodial services of electronic contract document) such as safe storage order book and confirmation of order;
S54: system sends the notification message of electronic contract documents such as entrusting order book and confirmation of order to the relevant side of accepting and order for goods user;
S55: the square tube of accepting and order for goods is crossed client and is filled in the electronics document related pattern information of preparation reception, submits electronics document associated safety sign subsidiary in the notification message to;
S56: information such as the secure ID of system verification notification message, valid expiration date, and prompting user; Like the expired notification message that then resends of notification message, use other secure ID instead;
S57: the side of accepting and order for goods downloads associated electrical contract documents such as order book and confirmation of order, shows Delivered after download finishes;
S58: the root of accepting and order for goods is confirmed treaty content according to electronic contract documents such as order book and confirmations of order;
S59: the side of accepting and order for goods signs electronically to electronic contract documents such as confirmations of order;
S5A: register electronic contract documents such as confirmations of order and send to order party through native system the side of accepting and order for goods;
S5B: according to user's service agreement, system calls the service of the former person's character proof of electronic contract document automatically, and relevant series electronic contract document is carried out the registration of former person's character proof as a whole;
Further, the electronic contract payment services of said step S6 are as shown in Figure 6, comprise the steps:
S61: the side of accepting and order for goods user uses electronic contract document safety to send to service and on the advice of charge file, registers advice of charge and attached document, and signs electronically; Former person's character realizes when proving as a whole
S62: system's making affirmation reception advice of charge etc. return to the side of accepting and order for goods for the confirmation of sending to of content;
S63: system is to the notification message of order party user Sending Payments notice;
S64: order party is filled in the electronics document related pattern information that prepare to receive, is submitted electronics document associated safety sign subsidiary in the notification message to through client;
S65: information such as the secure ID of system verification notification message, valid expiration date, and prompting user; Like the expired notification message that then resends of notification message, use other secure ID instead;
S66: order party is downloaded advice of charge, shows Delivered after download finishes;
S67: order party is confirmed advice of charge;
S68: back-up systems such as order party use accounting system carry out actual delivery to be handled;
S69: order party sends payment message and subsidiary electronic payment certificate through native system;
Further, the long-term custodial services of electronic contract document of said step S7, service content comprises:
S71: native system provides electronic contract document safekeeping service (agreed period or legal time limit),
S72: native system provides the inquiry service of electronic contract document;
S73: native system provides the service of browsing of electronic contract document;
S74: native system provides the print service of electronic contract document;
S75: native system is realized the backup custodial services by third party's stores service simultaneously, realizes electronic contract document back-up storage;
Further, the service of the former person's character proof of the electronic contract document of said step S8 comprises the steps:
S81: cooperate with third party, the service of the former person's character proof of electronic data document (electronic contract document) is provided by the third party;
S82: system logins third party's service platform automatically, realizes the registration of the former person's character proof of electronic contract document automatically;
S83: according to user's needs, system logins third party's service platform automatically, realizes the former person's character checking of electronic contract document;
Further, the electric signing verification service of said step S9 comprises the steps:
S91: this platform in time obtains associated user's digital certificate from PKI/CA mechanism;
S92: native system all users' in commendam digital certificate;
S93:, call the electric signing verification module electronic contract document signature of user's appointment is verified according to user's request;
S94: return the user rs authentication conclusion;
Further, third party's storage backup keeping performing step of said service S75 is following:
S751: the electronic contract document is encrypted
S752: the electronic contract document of encrypting is carried out packet, and carry out network code between the different pieces of information group;
S753: store encoded data into third party;
S754: the integrality of regularly checking third party's keeping data (electronic contract document);
Further, the registration of the former person's character proof of said step S82 electronic contract document comprises the steps:
S821: native system generates cryptographic hash with the electronic contract document of storage;
S822: the former person's character of third party's electronic data document (electronic contract document) of login cooperation proves service system automatically, carries out the former person's character registration of electronic contract document;
S823: obtain the former person's character registration certificate of electronic contract document;
S824: with certificate and electronic contract document safe storage together;
Further, the former person's character checking of said step S83 electronic contract document comprises the steps:
S831: native system is submitted the former person's character checking of electronic contract document request, the former person's character registration certificate of electronic contract document to the third party;
S832: the former person's character of third-party authentication electronic contract document;
S833: native system obtains the former person's character checking of electronics document certificate;
S834: the former person's character checking of return electron document certificate is given the user;
The foregoing description of the utility model only is to give an example for what explanation the utility model was done, and is not to be the qualification to the execution mode of the utility model.For the those of ordinary skill in affiliated field, on the basis of above-mentioned explanation, can also make other multi-form variation and changes.Here can't give exhaustive to all execution modes.Conspicuous variation that every technical scheme that belongs to the utility model is amplified out or change still are in the row of the protection range of the utility model.
Claims (4)
1. safe electronic contract service system; This service system comprises client, service end and the communication channel that connects both; Client is used for contract parties's registration and lands; Said client is connected with third party certification authority respectively with service end, and service end obtains and preserve contract parties's digital certificate to realize the identity validation to the contract both sides through third party certification authority; It is characterized in that: said service end proves that with third party independently server is connected simultaneously, proves former person's character the witness service of server to the electronic contract text by the third party.
2. electronic contract service system according to claim 1 is characterized in that: this service system also comprises the independently third party storage server that is used to provide the service of electronic contract text storage, and said third party's storage server is connected with service end.
3. electronic contract service system according to claim 1 and 2 is characterized in that: this service system also comprises the payment services system that is used to provide payment services, and said payment services system is connected with service end.
4. electronic contract service system according to claim 3 is characterized in that: said communication channel is the internet, applications interface channel of encrypting, the special VPN passage of setting up or special-purpose interface channel.
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| CN2011205118266U CN202424771U (en) | 2011-12-09 | 2011-12-09 | Security service system for electronic contracts |
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| CN2011205118266U CN202424771U (en) | 2011-12-09 | 2011-12-09 | Security service system for electronic contracts |
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| CN103679436A (en) * | 2013-12-17 | 2014-03-26 | 重庆邮电大学 | Electronic contract security system and method based on biological information identification |
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| CN103873255A (en) * | 2014-03-03 | 2014-06-18 | 杭州电子科技大学 | Electronic contract off-line signing method based on trusted third party |
| CN104065484A (en) * | 2014-06-26 | 2014-09-24 | 江苏买卖网电子商务有限公司 | Electronic contract platform realizing method based on SDK message and digital signature |
| CN104851037A (en) * | 2015-06-04 | 2015-08-19 | 中国电力科学研究院 | Method for signing electronic contract at mobile terminal |
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| CN108133150A (en) * | 2018-02-05 | 2018-06-08 | 北京公共交通控股（集团）有限公司 | Safety management system, storage medium and electric terminal based on contract dataset |
| CN108256862A (en) * | 2018-01-18 | 2018-07-06 | 常州优士多商贸有限公司 | A kind of long-range multi-user mall purchase system and its method for checking commodity details |
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- 2011-12-09 CN CN2011205118266U patent/CN202424771U/en not_active Expired - Fee Related
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| CN103679436B (en) * | 2013-12-17 | 2018-08-14 | 重庆邮电大学 | A kind of electronic contract security system and method based on biological information identification |
| CN103679436A (en) * | 2013-12-17 | 2014-03-26 | 重庆邮电大学 | Electronic contract security system and method based on biological information identification |
| CN103761659A (en) * | 2014-01-21 | 2014-04-30 | 国家电网公司 | Method for making tender offer list by using computer |
| CN103873255A (en) * | 2014-03-03 | 2014-06-18 | 杭州电子科技大学 | Electronic contract off-line signing method based on trusted third party |
| CN103873255B (en) * | 2014-03-03 | 2017-05-10 | 杭州电子科技大学 | Electronic contract network signing method based on trusted third party |
| CN104065484A (en) * | 2014-06-26 | 2014-09-24 | 江苏买卖网电子商务有限公司 | Electronic contract platform realizing method based on SDK message and digital signature |
| CN104065484B (en) * | 2014-06-26 | 2018-01-09 | 江苏买卖网电子商务有限公司 | A kind of electronic contract platform implementation method based on SDK short messages and digital signature |
| CN104851037A (en) * | 2015-06-04 | 2015-08-19 | 中国电力科学研究院 | Method for signing electronic contract at mobile terminal |
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