CN106301782B - Electronic contract signing method and system - Google Patents
Electronic contract signing method and system Download PDFInfo
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- CN106301782B CN106301782B CN201610600358.7A CN201610600358A CN106301782B CN 106301782 B CN106301782 B CN 106301782B CN 201610600358 A CN201610600358 A CN 201610600358A CN 106301782 B CN106301782 B CN 106301782B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
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- H—ELECTRICITY
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- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/3247—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures
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- H—ELECTRICITY
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- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
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- H04L9/3297—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving time stamps, e.g. generation of time stamps
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Abstract
The invention discloses a signing method and a system of an electronic contract, wherein the method comprises the following steps: receiving an electronic contract uploaded by a contract initiating end, and adding a timestamp of the current moment and an initial local electronic signature set based on the electronic contract into the electronic contract; sending the electronic contract to a contract signing end, and receiving the electronic contract returned by the contract signing end, wherein the electronic contract returned by the contract signing end comprises a time stamp of signing time added by the contract signing end and an electronic signature of a signing party set based on the received electronic contract; and adding the timestamp of the current moment and the final local electronic signature set based on the electronic contract returned by the contract signing end into the electronic contract returned by the contract signing end to finish signing. The electronic contract is signed by a signature mode of adding a time stamp and an electronic signature, and time information contained in the time stamp has irreversibility, so that the validity and the anti-counterfeiting performance of the electronic contract content and all signatures are effectively guaranteed.
Description
Technical Field
The invention relates to the technical field of electronic contracts, in particular to a signing method and a signing system of an electronic contract.
Background
With the development of electronic technology, electronic contracts appear with the characteristics of convenient transmission, saving and the like, and the electronic contracts transmit information through electronic pulses, but do not use a piece of paper as an original credential any more, but only a group of electronic information.
The content tamper resistance of a general electronic contract can be ensured through digital signature, specifically, the text of the electronic contract is subjected to Hash calculation to obtain a text abstract, the text abstract is encrypted by using a private key of a contract initiating end to generate a digital signature, and the digital signature is added into the electronic contract; the contract receiving party can decrypt the digital signature by using the public key of the contract initiating end to obtain a text abstract, meanwhile, hash calculation is carried out on the text of the received electronic contract to obtain the text abstract, the text abstract is compared with the text abstract obtained from the digital signature, if the text abstract is consistent with the text abstract, the electronic contract is not tampered, and if not, the electronic contract is tampered. However, the inventor has found that, in the above-mentioned technical solution, only the content tamper resistance of the electronic contract can be achieved, and the authenticity of the digital signature cannot be determined, so that if the electronic contract is illegally tampered and the digital signature is also illegally tampered, the content verification purpose that the digital signature needs to achieve cannot be achieved.
In summary, how to provide a technical scheme for realizing the digital signature anti-counterfeiting property in the electronic contract is a problem to be solved urgently by technical personnel in the field at present.
Disclosure of Invention
The invention aims to provide a signing method and a signing system of an electronic contract, so as to realize the anti-counterfeiting performance of a digital signature in the electronic contract.
A method of signing an electronic contract, comprising:
receiving an electronic contract uploaded by a contract initiating end, and adding a timestamp of the current moment and an initial local electronic signature set based on the electronic contract into the electronic contract;
sending the electronic contract to a contract signing end, and receiving the electronic contract returned by the contract signing end, wherein the electronic contract returned by the contract signing end comprises a time stamp of signing time added by the contract signing end and an electronic signature of a signing party set based on the received electronic contract;
and adding a timestamp of the current moment and a final local electronic signature set based on the electronic contract returned by the contract signing end into the electronic contract returned by the contract signing end to finish signing.
Preferably, setting an initial local electronic signature based on the electronic contract includes:
performing hash calculation on the text of the electronic contract to obtain a first abstract;
and encrypting the first abstract by using a local private key to obtain a corresponding initial local electronic signature.
Preferably, after adding the timestamp of the current time and the initial local electronic signature set based on the electronic contract into the electronic contract, the method further includes:
and adding a local digital certificate containing local identity information and a local public key into the electronic contract.
Preferably, before adding the local digital certificate, the initial local electronic signature and the corresponding timestamp into the electronic contract, the method further includes:
and authenticating the local digital certificate, and adding the local digital certificate, the initial local electronic signature and the corresponding timestamp into the electronic contract after the local digital certificate passes the authentication.
Preferably, the sending the electronic contract to a contract signing terminal and receiving the electronic contract returned by the contract signing terminal includes:
sending the electronic contract to a first contract signing end, and receiving a corresponding electronic contract returned by the contract signing end; and sending the electronic contract returned by the first contract signing end to the second contract signing end, and receiving the corresponding electronic contract returned by the contract signing end until the electronic contract returned by the last contract signing end is received.
Preferably, after the contract signing end adds the corresponding electronic signature of the signing party and the time stamp of the signing time to the electronic contract, the method further includes:
and adding the authenticated signing party identity information and signing place information into the electronic contract.
Preferably, the contract signing end sets a corresponding signing party electronic signature, including:
performing hash calculation on the received text of the electronic contract and other information which is newly added into the electronic contract except the timestamp to obtain a second abstract;
and encrypting the second abstract and the visible identity certificate of the contract signing end by using a private key of the signing party to obtain a corresponding electronic signature of the signing party.
Preferably, the setting of the final local electronic signature based on the electronic contract returned by the contract signing side includes:
performing hash calculation on the text of the electronic contract returned by the contract signing end and other information which is newly added into the electronic contract except the timestamp to obtain a third abstract;
and encrypting the third abstract and the authenticated electronic contract information by using a local private key to obtain the final local electronic signature.
Preferably, before adding the timestamp of the current time and the initial local electronic signature set based on the electronic contract into the electronic contract, the method further includes:
and adding the time stamp of the current moment and the electronic signature of the document set based on the received contract document into the contract document every time the contract document which is uploaded by the contract initiating end and is contained in the electronic contract is received.
A system for signing an electronic contract, comprising:
the contract initiating end is used for uploading the electronic contract;
a contract management end for: receiving an electronic contract uploaded by a contract initiating end, and adding a timestamp of the current moment and an initial local electronic signature set based on the electronic contract into the electronic contract; sending the electronic contract to a contract signing end, and receiving the electronic contract returned by the contract signing end; adding a timestamp at the current moment and a final local electronic signature set based on the electronic contract returned by the contract signing end into the electronic contract returned by the contract signing end to finish signing;
and the contract signing end is used for receiving the electronic contract sent by the contract management end and adding a time stamp of the signing time and an electronic signature of a signing party set based on the received electronic contract into the electronic contract.
The invention provides a method and a system for signing an electronic contract, wherein the method comprises the following steps: receiving an electronic contract uploaded by a contract initiating end, and adding a timestamp of the current moment and an initial local electronic signature set based on the electronic contract into the electronic contract; sending the electronic contract to a contract signing end, and receiving the electronic contract returned by the contract signing end, wherein the electronic contract returned by the contract signing end comprises a time stamp of signing time added by the contract signing end and an electronic signature of a signing party set based on the received electronic contract; and adding a timestamp of the current moment and a final local electronic signature set based on the electronic contract returned by the contract signing end into the electronic contract returned by the contract signing end to finish signing. In the technical scheme disclosed by the application, the signing of the electronic contract by the third party signing platform or the signing of the electronic contract by the contract signing end is realized by adopting a signature mode of adding the electronic signature by the timestamp, namely, the signature added into the electronic contract comprises the electronic signature and the corresponding timestamp, and the time information contained in the timestamp has irreversibility, so that the validity and the anti-counterfeiting performance of all signatures and contract contents in the electronic contract are effectively ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a method for signing an electronic contract according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electronic contract signing system provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flowchart of a method for signing an electronic contract according to an embodiment of the present invention is shown, which may include the following steps:
s11: and receiving the electronic contract uploaded by the contract initiating end, and adding the timestamp of the current moment and the initial local electronic signature set on the basis of the electronic contract into the electronic contract.
It should be noted that, in the embodiment of the present invention, the execution subject of the step that is not labeled and is not explicitly labeled as the subject can be the third party signing platform. After receiving the electronic contract uploaded by the contract initiator, a timestamp and an initial local electronic signature at the current moment need to be added to the electronic contract. The timestamp may be obtained by a timestamp service, and specifically, the setting of the timestamp may specifically include: performing hash calculation on a text of the electronic contract to obtain a corresponding text abstract, and encrypting the text abstract and the current time by using a private key corresponding to a timestamp service to obtain a timestamp, wherein the current time specifically comprises year, month, day, hour, minute and second; the time stamps involved in the embodiments of the present invention may all be set according to the above method, and the difference mainly lies in the time contained in the time stamps. The initial local electronic signature and the electronic signature set by the third party signing platform based on the electronic contract locally, specifically, the electronic signature involved in the embodiment of the invention can be both digital signatures. Therefore, after the electronic contract is received, the electronic signature and the timestamp before signing are added to the electronic contract, so that the contract is locked, and the document is guaranteed to be tamper-resistant, and integrity and anti-counterfeiting performance of the document are guaranteed.
S12: and sending the electronic contract to a contract signing end, and receiving the electronic contract returned by the contract signing end, wherein the electronic contract returned by the contract signing end comprises a time stamp of signing time added by the contract signing end and an electronic signature of a signing party set based on the received electronic contract.
The electronic contract signing method includes that a contract signing end, namely a terminal corresponding to a contract signing party needing to sign the contract, sends an electronic contract added with a first electronic signature and a corresponding time stamp to the contract signing end, the contract signing end can realize the verification of the electronic contract according to the first electronic signature and the corresponding time stamp, and after the verification is passed, the electronic contract is signed by adding the electronic signature of the signing party corresponding to the contract signing end and the time stamp of signing time to the electronic contract.
S13: and adding the timestamp of the current moment and the final local electronic signature set based on the electronic contract returned by the contract signing end into the electronic contract returned by the contract signing end to finish signing.
After each contract signing end finishes signing the contract, the third party signing platform of the contract can use the private key of the third party, namely the local private key to carry out final signature confirmation, namely the timestamp and the final local electronic signature at the current moment are added into the electronic contract to finish signing the electronic contract, thereby ensuring the validity, the integrity and the anti-counterfeiting performance of the electronic contract content and all the signatures. In the technical scheme disclosed by the application, the signing of the electronic contract by the third party signing platform or the signing of the electronic contract by the contract signing end is realized by adopting a signature mode of adding the electronic signature by the timestamp, namely, the signature added into the electronic contract comprises the electronic signature and the corresponding timestamp, and the time information contained in the timestamp has irreversibility, so that the validity and the anti-counterfeiting performance of all signatures and contract contents in the electronic contract are effectively ensured. In addition, in the above technical solution provided by the embodiment of the present invention, each time a signature is added to an electronic contract is implemented based on the whole electronic contract, that is, based on the main body and the attachment of a contract document included in the electronic contract, therefore, any part of the electronic contract is tampered with, which may cause the signature therein to be invalid, thereby further ensuring the validity of the signature in the electronic contract by means of the single-point signature.
Specifically, according to the technical scheme provided by the embodiment of the invention, the signature of the contract is completed in a mode of adding a timestamp to the electronic signature from the uploading to the completion of the signing of the contract by combining the safety requirements of the client on the electronic contract, so that the safety of the electronic contract and the safety of the signature are ensured; after the electronic contract is uploaded, a third party signs the platform and then adds the self signature of the platform, wherein the signature comprises an initial local electronic signature and a corresponding timestamp to ensure the safety of the content of the electronic contract; after each contract signing end signs, the third party signing platform ensures the anti-counterfeiting performance of the content of the electronic contract and the integrity of the signature of each contract signing end through the own signature, including the final local electronic signature and the corresponding timestamp; aiming at the characteristics that the electronic contract usually comprises a contract main body and an attachment, the signature is realized based on the whole contract, and the validity of the content of the electronic contract and the validity of the signature in the electronic contract are ensured through a multi-document single-point signature technology.
The method for signing the electronic contract provided by the embodiment of the invention sets the initial local electronic signature based on the electronic contract, and comprises the following steps:
performing Hash calculation on the text of the electronic contract to obtain a first abstract;
and encrypting the first abstract by using a local private key to obtain a corresponding initial local electronic signature.
It should be noted that the local private key is the private key of the third party signing platform. The initial local electronic signature is obtained through the method, and then the initial local electronic signature and the corresponding timestamp are added into the electronic contract, so that the electronic contract is locked before being signed, and the integrity and the anti-counterfeiting performance of the electronic contract are guaranteed.
In addition, after adding the timestamp of the current time and the initial local electronic signature set based on the electronic contract into the electronic contract, the method may further include:
and adding a local digital certificate containing local identity information and a local public key into the electronic contract.
The local digital certificate comprises local identity information and a local public key, so that when the identity information of the third party signing platform needs to be verified, verification can be performed by acquiring the local identity information in the local digital certificate, comparison can be performed by confirming the local public key in the local digital certificate and the local public key uniformly published by the third party signing platform, and if the local public key in the local digital certificate is consistent with the local public key uniformly published by the third party signing platform, the validity of the local digital certificate of the third party signing platform can be further proved.
Specifically, before adding the local digital certificate, the initial local electronic signature, and the corresponding timestamp into the electronic contract, the method may further include:
and authenticating the local digital certificate, and adding the local digital certificate, the initial local electronic signature and the corresponding timestamp into the electronic contract after the local digital certificate passes the authentication.
The authentication of the local digital certificate can be realized by comparing the local public key in the local digital certificate with the local public key uniformly published by the third party signing platform, the verification of the valid period of the local digital certificate can be further included, if the valid period of the local digital certificate is exceeded, the authentication is not passed, otherwise, the authentication is passed, and after each authentication of the local digital certificate is passed, the local digital certificate, the initial local electronic signature and the corresponding timestamp are added into the electronic contract, so that the security of the electronic contract is prevented from being threatened due to the non-compliance of the third party signing platform.
The first digital signature and the timestamp in the embodiment of the present invention may be formed as follows:
Sum＝Digest(document)
Signature＝Encrypt(Sum)+Certificate
Final Sign＝LTV(Signature)+Timestamp
where LTV denotes long-term authentication, i.e. denotes authentication of the local digital certificate as described above.
In addition, the step S12, which involves the contract signing end verifying the electronic contract according to the initial local electronic signature and the corresponding timestamp, may include: decrypting the initial local electronic signature by using a local public key of a third-party signing platform to obtain a first abstract; and carrying out Hash calculation on the electronic contract, comparing the obtained abstract with the first abstract, and if the obtained abstract is consistent with the first abstract, passing the inspection. The method can also comprise the following steps: the time stamp is checked according to the same principle as the time stamp is checked in the prior art, and details are not repeated herein.
The electronic contract signing method provided by the embodiment of the invention sends the electronic contract to the contract signing end and receives the electronic contract returned by the contract signing end, and the electronic contract signing method can comprise the following steps:
sending the electronic contract to a first contract signing end, and receiving a corresponding electronic contract returned by the contract signing end; and sending the electronic contract returned by the first contract signing end to the second contract signing end, and receiving the corresponding electronic contract returned by the contract signing end until the electronic contract returned by the last contract signing end is received.
When the number of contract signing parties is multiple, the electronic contract needs to be sent to the contract signing end corresponding to the first contract signing party, and after receiving the returned electronic contract, the electronic contract needs to be sent to the contract signing end corresponding to the second contract signing party until all the contract signing ends receive the electronic contract and return the electronic contract.
After the contract signing end adds the corresponding electronic signature of the signing party and the time stamp of the signing time into the electronic contract, the method can further comprise the following steps:
and the contract signing end adds the authenticated signing party identity information and the signing place information into the electronic contract.
It should be noted that, each signing party identity information and signing place information need to be authenticated by the third party signing platform, and the authentication here is consistent with the corresponding authentication principle in the prior art, and is not described herein again. The authenticated signing party identity information and signing place information can be as follows:
therefore, the electronic contract comprises the signer identity information and the signing place information, so that the electronic contract can be used for obtaining the evidence and verifying the authenticity, and the validity and the anti-counterfeiting performance of the corresponding signature are further ensured.
In addition, the contract signing end sets a corresponding signing party electronic signature, which may include:
the contract signing end carries out hash calculation on the received text of the electronic contract and other information which is newly added into the electronic contract except the timestamp to obtain a second abstract;
and the contract signing end encrypts the second abstract and the visible identity certificate of the contract signing end by using the private key of the signing party to obtain a corresponding electronic signature of the signing party.
The visible identification may be a visible signature or a handwritten signature picture. The signing party identity information and the signing place information can be embedded into the signature through JSON, for example, as follows:
Sum＝Digest(document+previous Signature)
Signature＝Encrypt(Sum,StampImage)+SignerInfo
Final Sign＝LTV(Signature)+Timestamp
the ltv (signature) authenticates the signing party identity information and the signing location information, and is implemented by the third party signing platform. Therefore, the signatures of the electronic contracts by the different contract signing ends are overlapped, namely the realization of each signature needs to be realized based on the previous signature, so that the corresponding signature is completely invalid due to the tampering of any signature, and the anti-counterfeiting performance of the signature is further ensured.
The method for signing the electronic contract provided by the embodiment of the invention sets the final local electronic signature based on the electronic contract returned by the contract signing end, and comprises the following steps:
performing hash calculation on the text of the electronic contract returned by the contract signing end and other information which is newly added into the electronic contract except the timestamp to obtain a third abstract;
and encrypting the third abstract and the authenticated electronic contract information by using a local private key to obtain a final local electronic signature.
The electronic contract information may include contract name, contract initiator, initiation time, final contract signing time, and the like, and may be determined according to actual needs. Specifically, the implementation of the electronic contract information may be as follows:
and the final signature may be implemented as follows:
Sum＝Digest(document+previous Signature)
Signature＝Encrypt(Sum，DocumentInfo)
Final Sign＝LTV(Signature)+Timestamp
the ltv (signature) represents authentication of the electronic contract information, thereby ensuring security and validity of the signature. Therefore, corresponding signature is carried out on the electronic contract before and after the electronic contract is signed, the electronic contract is locked before the electronic contract is signed, and the electronic contract is confirmed after the electronic contract is signed, so that the integrity and the anti-counterfeiting performance of the electronic contract are ensured.
The signing method of the electronic contract provided by the embodiment of the invention can also comprise the following steps before adding the time stamp of the current time and the initial local electronic signature set based on the electronic contract into the electronic contract:
and adding the time stamp of the current moment and the electronic signature of the document set based on the received contract document into the contract document every time the contract document which is uploaded by the contract initiating end and is contained in the electronic contract is received.
It should be noted that, during uploading of the electronic contract, if the uploading is interrupted due to some reason, the validity and the anti-counterfeiting performance of the uploaded contract documents need to be ensured, so to implement the above guarantee, a corresponding signature, that is, a document electronic signature and a corresponding timestamp, needs to be added after each contract document is uploaded, thereby ensuring the authenticity and the integrity of the electronic contract. The setting of the document electronic signature specifically may include: and carrying out Hash calculation on the text of the contract document to obtain a corresponding abstract, and then encrypting the abstract by using a local private key to obtain a corresponding document electronic signature.
In addition, it should be noted that the specific implementation manner in the above technical solutions provided in the embodiments of the present invention is only a preferred manner, and other technical solutions capable of achieving the object of the present invention are within the protection scope of the present invention.
Corresponding to the above method, an embodiment of the present invention further provides an electronic contract signing system, as shown in fig. 2, which may include:
a contract initiating terminal 11 for uploading the electronic contract;
a contract management end 12, configured to: receiving an electronic contract uploaded by a contract initiating end, and adding a timestamp of the current moment and an initial local electronic signature set based on the electronic contract into the electronic contract; sending the electronic contract to a contract signing end, and receiving the electronic contract returned by the contract signing end; adding a timestamp at the current moment and a final local electronic signature set based on the electronic contract returned by the contract signing end into the electronic contract returned by the contract signing end to finish signing;
and a contract signing terminal 13, configured to receive the electronic contract sent by the contract management terminal, and add a time stamp of the signing time and an electronic signature of a signing party set based on the received electronic contract to the electronic contract.
In the system for signing an electronic contract provided by the embodiment of the present invention, the contract management end includes:
a first electronic signature setup module to: performing Hash calculation on the text of the electronic contract to obtain a first abstract; and encrypting the first abstract by using a local private key to obtain a corresponding initial local electronic signature.
In the system for signing an electronic contract provided in the embodiment of the present invention, the contract managing end further includes:
a digital certificate addition module to: and adding a local digital certificate containing local identity information and a local public key into the electronic contract.
In the system for signing an electronic contract provided in the embodiment of the present invention, the contract managing end further includes:
a certificate authentication module to: and authenticating the local digital certificate, and adding the local digital certificate, the initial local electronic signature and the corresponding timestamp into the electronic contract after the local digital certificate passes the authentication.
In the system for signing an electronic contract provided by the embodiment of the present invention, the contract management end includes:
a contract distribution module to: sending the electronic contract to a first contract signing end, and receiving a corresponding electronic contract returned by the contract signing end; and sending the electronic contract returned by the first contract signing end to the second contract signing end, and receiving the corresponding electronic contract returned by the contract signing end until the electronic contract returned by the last contract signing end is received.
In the system for signing an electronic contract provided by the embodiment of the present invention, the contract signing end further includes:
a signing information adding module for: and adding the authenticated signing party identity information and signing place information into the electronic contract.
In the system for signing an electronic contract provided by the embodiment of the present invention, a contract signing end includes:
the signing party electronic signature setting module is used for: performing hash calculation on the received text of the electronic contract and other information which is newly added into the electronic contract except the timestamp to obtain a second abstract; and encrypting the second abstract and the visible identity certificate of the contract signing end by using the private key of the signing party to obtain a corresponding electronic signature of the signing party.
In the system for signing an electronic contract provided by the embodiment of the present invention, the contract management end includes:
a second electronic signature setup module to: performing hash calculation on the text of the electronic contract returned by the contract signing end and other information which is newly added into the electronic contract except the timestamp to obtain a third abstract; and encrypting the third abstract and the authenticated electronic contract information by using a local private key to obtain a final local electronic signature.
In the system for signing an electronic contract provided in the embodiment of the present invention, the contract managing end further includes:
and the document electronic signature adding module is used for adding the timestamp of the current moment and the document electronic signature set based on the received contract document into the contract document every time the contract document which is uploaded by the contract initiating end and is contained in the electronic contract is received.
For a description of relevant parts in the system for signing an electronic contract provided in the embodiment of the present invention, please refer to detailed descriptions of corresponding parts in the method for signing an electronic contract provided in the embodiment of the present invention, which are not described herein again.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A method of signing an electronic contract, comprising:
receiving an electronic contract uploaded by a contract initiating end, and adding a timestamp of the current moment and an initial local electronic signature set based on the electronic contract into the electronic contract;
sending the electronic contract to a contract signing end, and receiving the electronic contract returned by the contract signing end, wherein the electronic contract returned by the contract signing end comprises a time stamp of signing time added by the contract signing end and an electronic signature of a signing party set based on the received electronic contract;
adding a timestamp at the current moment and a final local electronic signature set based on the electronic contract returned by the contract signing end into the electronic contract returned by the contract signing end to finish signing;
wherein, the process of obtaining the timestamp of the current time comprises the following steps:
performing Hash calculation on the electronic contract to obtain a corresponding text abstract, and encrypting the text abstract and the current time by using a private key corresponding to a timestamp service to obtain a timestamp;
setting an initial local electronic signature based on the electronic contract, comprising:
performing hash calculation on the text of the electronic contract to obtain a first abstract;
encrypting the first abstract by using a local private key to obtain a corresponding initial local electronic signature;
after adding the timestamp of the current moment and the initial local electronic signature set based on the electronic contract into the electronic contract, the method further comprises the following steps:
adding a local digital certificate containing local identity information and a local public key into the electronic contract;
before adding the local digital certificate, the initial local electronic signature and the corresponding timestamp into the electronic contract, the method further comprises the following steps:
authenticating the local digital certificate, and adding the local digital certificate, the initial local electronic signature and the corresponding timestamp into the electronic contract after the local digital certificate passes the authentication;
before adding the timestamp of the current moment and the initial local electronic signature set based on the electronic contract into the electronic contract, the method further comprises the following steps:
and adding the time stamp of the current moment and the electronic signature of the document set based on the received contract document into the contract document every time the contract document which is uploaded by the contract initiating end and is contained in the electronic contract is received.
2. The method of claim 1, wherein sending the electronic contract to a contract signing end and receiving the electronic contract returned by the contract signing end comprises:
sending the electronic contract to a first contract signing end, and receiving a corresponding electronic contract returned by the contract signing end; and sending the electronic contract returned by the first contract signing end to the second contract signing end, and receiving the corresponding electronic contract returned by the contract signing end until the electronic contract returned by the last contract signing end is received.
3. The method as claimed in claim 2, wherein the contract signing end adds the corresponding electronic signature of the signing party and the time stamp of the signing time to the electronic contract, and further comprises:
and adding the authenticated signing party identity information and signing place information into the electronic contract.
4. The method as claimed in claim 3, wherein the contract signing end sets a corresponding signing party electronic signature, comprising:
performing hash calculation on the received text of the electronic contract and other information which is newly added into the electronic contract except the timestamp to obtain a second abstract;
and encrypting the second abstract and the visible identity certificate of the contract signing end by using a private key of the signing party to obtain a corresponding electronic signature of the signing party.
5. The method of claim 1, wherein setting a final local electronic signature based on the electronic contract returned by the contract signing end comprises:
performing hash calculation on the text of the electronic contract returned by the contract signing end and other information which is newly added into the electronic contract except the timestamp to obtain a third abstract;
and encrypting the third abstract and the authenticated electronic contract information by using a local private key to obtain the final local electronic signature.
6. An electronic contract signing system, comprising:
the contract initiating end is used for uploading the electronic contract;
a contract management end for: receiving an electronic contract uploaded by a contract initiating end, and adding a timestamp of the current moment and an initial local electronic signature set based on the electronic contract into the electronic contract; sending the electronic contract to a contract signing end, and receiving the electronic contract returned by the contract signing end; adding a timestamp at the current moment and a final local electronic signature set based on the electronic contract returned by the contract signing end into the electronic contract returned by the contract signing end to finish signing;
the contract signing terminal is used for receiving the electronic contract sent by the contract management terminal and adding a time stamp of signing time and a signing party electronic signature set based on the received electronic contract into the electronic contract;
wherein, the process of obtaining the timestamp of the current time by the contract management end and the contract signing end comprises the following steps:
performing Hash calculation on the electronic contract to obtain a corresponding text abstract, and encrypting the text abstract and the current time by using a private key corresponding to a timestamp service to obtain a timestamp;
the contract management terminal comprises:
a first electronic signature setup module to: performing hash calculation on the text of the electronic contract to obtain a first abstract; encrypting the first abstract by using a local private key to obtain a corresponding initial local electronic signature;
the contract management terminal further comprises:
a digital certificate addition module to: adding a timestamp at the current moment and an initial local electronic signature set based on the electronic contract into the electronic contract, and then adding a local digital certificate containing local identity information and a local public key into the electronic contract;
a certificate authentication module to: before adding a local digital certificate, an initial local electronic signature and a corresponding timestamp into the electronic contract, authenticating the local digital certificate, and after the local digital certificate passes the authentication, adding the local digital certificate, the initial local electronic signature and the corresponding timestamp into the electronic contract;
a document electronic signature adding module for: before adding the timestamp of the current moment and the initial local electronic signature set based on the electronic contract into the electronic contract, adding the timestamp of the current moment and the electronic signature set based on the received contract document into the contract document every time receiving one contract document which is uploaded by the contract initiating end and is contained in the electronic contract.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610600358.7A CN106301782B (en) | 2016-07-26 | 2016-07-26 | Electronic contract signing method and system |
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| CN201610600358.7A CN106301782B (en) | 2016-07-26 | 2016-07-26 | Electronic contract signing method and system |
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