CN103595721A - Safe sharing method, sharing device and sharing system for files of network disk - Google Patents
Safe sharing method, sharing device and sharing system for files of network disk Download PDFInfo
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Abstract
The invention discloses a safe sharing method, sharing device and sharing system for files of a network disk. The safe sharing method for the files of the network disk comprises the following steps that identity information of a shared person is obtained; the identity information of the shared person is sent to a digital certificate service in a network disk server, and a public key, obtained by the digital certificate service in a calculated mode on the basis of the identity information of the shared person, of the shared person is received; a random file secret key is obtained from file secret key services of the network disk server, and the shared files are encrypted through the file secret key; the file secret key is stored in a configuration file, and the configuration file is encrypted by means of the public key; the encrypted shared files and the encrypted configuration file are compressed and uploaded to the network disk server to be shared. According to the safe sharing method, sharing device and sharing system, identity authentication and secret key encryption are combined, safety strength is high, a third-party user cannot browse the shared files, the problem that the secret key is easily disclosed in a transmission process is resolved, and safe sharing of the files of the network disk is effectively guaranteed.
Description
Technical Field
The invention relates to the technical field of computer network security, in particular to a method, a device and a system for safely sharing network disk files.
Background
With the development and popularization of networks, the internet and the local area network gradually become main tools for office automation, and resource sharing can be realized more and more conveniently. In recent years, with the advent of file storage services such as public network disks and enterprise network disks, network disk file sharing has become one of the commonly used sharing methods. At present, when network disk files are shared, plaintext is used for storage during sharing, or a symmetric algorithm based on a random key is adopted, the two modes lack effective protective measures, the risk of key leakage exists, and the safety of the shared files cannot be guaranteed.
Disclosure of Invention
In view of the above, the present invention provides a method, a device and a system for secure sharing of a network disk file, so as to solve the problems that a secret key is easy to leak and the security of a shared file is seriously affected when the network disk file is shared,
in one aspect, the present invention provides a method for securely sharing a network disk file, including the following steps: an identity information acquisition step, which is to acquire the identity information of the shared person; a public key obtaining step, namely sending the identity information of the shared person to a digital certificate service in a network disk server, and receiving the public key of the shared person calculated and obtained by the digital certificate service based on the identity information of the shared person; a shared file encryption step, namely acquiring a random file key from a file key service in a network disk server and encrypting the shared file by using the file key; a configuration file encryption step, storing the file secret key in a configuration file, and encrypting the configuration file through the public key; and a sharing step, namely compressing the encrypted shared file and the encrypted configuration file and uploading the compressed shared file and the configuration file to a network disk server for sharing.
Further, in the above method for sharing a network disk file, the step of encrypting the shared file and the step of encrypting the configuration file further include: a sharing authority setting step, setting the sharing authority of the shared person; and in the step of encrypting the configuration file, the sharing authority is stored in the configuration file.
Further, in the above method for sharing a network disk file, the sharing authority includes read-only, read-write, reading times, reading time limit, and copy inhibition.
Further, in the above method for sharing a network disk file, the identity information includes a login account and a password.
The invention combines identity authentication and key encryption, has high safety intensity, solves the problem that a third party user cannot browse shared files, is easy to leak in the key transmission process, and effectively ensures the safe sharing of the network disk files; in addition, the use authority of the sharee can be flexibly controlled.
On the other hand, the invention also provides a safe sharing device of the network disk file, and the system comprises: the identity information acquisition module is used for acquiring the identity information of the shared person; the public key acquisition module is used for sending the identity information of the shared person to a digital certificate service in the network disk server and receiving the public key of the shared person calculated and acquired by the digital certificate service based on the identity information of the shared person; the shared file encryption module is used for acquiring a random file key from a file key service in the network disk server and encrypting the shared file by using the file key; the configuration file encryption module is used for storing the file secret key in a configuration file and encrypting the configuration file through the public key; and the sharing module is used for compressing the encrypted sharing file and the encrypted configuration file and uploading the compressed sharing file and the configuration file to a network disk server for sharing.
Further, the above network disk file sharing apparatus further includes: the sharing authority setting module is used for setting the sharing authority of the shared person; the configuration file encryption module also stores the sharing permission in a configuration file.
Further, in the above network disk file sharing apparatus, the sharing authority includes read-only, readable-writable, reading times, reading time limit, and copy inhibition.
In another aspect, the present invention further provides a secure sharing system for network disk files, which includes a client used by a sharer, a client used by a sharee, and a network disk server; the client used by the sharer receives the identity information logged in by the sharee in the network disk server and sends the identity information to a digital authentication center in the network disk server; the digital authentication center receives the identity information, obtains a public key of the sharee by using a digital signature algorithm based on the identity, and returns the public key to the client used by the sharer; the client used by the sharer receives the public key, sets the sharing authority of the sharer, encrypts the shared file by using a random file key acquired from a file key service in the network disk server, stores the file key and the sharing authority in a configuration file, encrypts the configuration file by using the public key, and compresses and uploads the encrypted shared file and the configuration file to the network disk server; the network disk server receives and stores the compressed file; the client used by the sharee downloads the compressed file from the network disk server, decrypts the configuration file by using the private key of the sharee, acquires a file secret key and sharing authority, decrypts the shared file by using the file secret key, and enjoys the file in the sharing authority range.
Further, in the above-mentioned network disk file sharing system, the information transmission is performed between the client used by the sharer, the client used by the sharee and the network disk server through HTTP or FTP protocols.
Further, in the above-mentioned network disk file sharing system, the client used by the sharer and the client used by the sharee are all installed with process protection, registry protection and file path protection.
Since the principle of the network disk file sharing device, the sharing system and the sharing method is similar, the sharing device and the sharing system also have the same technical effect as the sharing method.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flowchart of an embodiment of a method for secure sharing of network disk files according to the present invention;
FIG. 2 is a flowchart illustrating a secure sharing method of network disk files according to another embodiment of the present invention;
FIG. 3 is a block diagram of an embodiment of a secure sharing apparatus for network disk files according to the present invention;
FIG. 4 is a block diagram of another embodiment of the apparatus for securely sharing network disk files according to the present invention;
FIG. 5 is a block diagram of a secure sharing system for network disk files according to an embodiment of the present invention;
fig. 6 is a block diagram of another structure of the embodiment of the secure sharing system for network disk files of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment of the sharing method comprises the following steps:
referring to fig. 1, fig. 1 is a flowchart of an embodiment of a method for secure sharing of a network disk file according to the present invention. This embodiment comprises the steps of:
an identity information acquisition step S1 of acquiring identity information of the sharee; a public key obtaining step S2, sending the identity information of the sharee to a digital certificate service in the network disk server, and receiving a public key of the sharee calculated and obtained by the digital certificate service based on the identity information of the sharee; a shared file encryption step S3, acquiring a random file key from the file key service in the network disk server, and encrypting the shared file with the file key; a configuration file encryption step S5 of storing the file key in a configuration file and encrypting the configuration file by the public key; and a sharing step S6, compressing the encrypted sharing file and configuration file and uploading the compressed sharing file and configuration file to a network disk server for sharing.
The identity information of the shared person may be a login account, a password, or other information that can indicate an identity, such as a fingerprint.
When a sharee needs to acquire a shared file, firstly, the sharee logs in the network disk server through the used client, after the sharee acquires identity information such as a login account number of the sharee in the network disk server, the client used by the sharee sends the identity information of the sharee to a digital certificate service in the network disk server through a secure link, and the digital certificate service can acquire a public key of the sharee by using a digital signature algorithm based on an identity and return the public key to the client used by the sharee. In specific implementation, the digital signature algorithm may use an asymmetric algorithm such as RSA, ECC (Elliptic cryptograph).
The sharer obtains a random file key from the file key service in the network disk server through the secure link at the same time, and encrypts the shared file into a ciphertext file by using the file key. In specific implementation, the Encryption Algorithm for the shared file may adopt symmetric algorithms such as DES (Data Encryption Standard), AES (Advanced Encryption Standard), 3DES (Triple Data Encryption Algorithm), and the like. In addition, the file key is stored in an XML-based configuration file, and the configuration file is encrypted through the acquired public key. And packaging the ciphertext file and the configuration file in a compressed file with a specific format, uploading the compressed file to a network disk server, and sharing the compressed file to a shared person. It should be noted that, in this embodiment, the compression format is not specifically limited, and may be a known zip format or a custom format.
The shared person downloads the compressed file from the network disk server, the client used by the shared person utilizes the private key of the shared person to decrypt the information in the configuration file, the file key is obtained, the shared file is decrypted by utilizing the file key, and the shared file is used.
It can be seen that, in this embodiment, the identity authentication and the key encryption are combined, the public key is first obtained from the network disk server by using the identity information of the shared user, then the shared file is encrypted by the file key randomly obtained from the network disk server, the file key is encrypted by the public key, and finally the encrypted shared file and the configuration file are compressed and uploaded to the server for sharing. Compared with the existing network disk sharing mode, the public key in the embodiment is obtained based on the identity information of the sharee, the file key is encrypted by utilizing the public key, the security intensity is high, a third-party user cannot browse the shared file, the problem that the secret key is easy to leak in the transmission process is solved, and the safe sharing of the network disk file is effectively ensured.
For different sharees, different use rights may exist for the network disk file, for example, some sharees have read-only rights, some sharees have read-write rights, etc. In order to control the use authority of the shared person, the embodiment can be further improved: setting sharing authority for the file to be shared, referring to fig. 2 in particular, adding before the step of encrypting the configuration file S5: a sharing authority setting step S4 of setting a sharing authority of the sharee; in the profile encryption step S5, the sharing authority is also stored in the profile, and the sharing authority and the encrypted shared file are compressed together by the public key. The sharing authority can be read only, readable and writable, reading times, reading time limit, copy inhibition and the like.
In the embodiment, the authority management is set for the sharee, the reading authority of the sharee can be controlled, and the events of illegal copying, re-sharing, screen capturing and the like are prevented.
It should be noted that the sharing authority setting step S4 may be performed before the profile encryption step S5. In a specific implementation, the sharing authority setting step S4 may be set between the shared file encrypting step S3 and the configuration file encrypting step S4, or between the public key obtaining step S2 and the shared file encrypting step S3, and the specific location of the sharing authority setting step S4 is not limited in the present invention.
In conclusion, the embodiment combines the identity authentication with the key encryption, so that the security strength is high, the third-party user cannot browse the shared file, the problem that the secret key is easy to leak in the transmission process is solved, and the safe sharing of the network disk file is effectively ensured; in addition, the use authority of the sharee can be flexibly controlled.
The embodiment of the sharing device comprises:
referring to fig. 3, fig. 3 is a block diagram illustrating a structure of an embodiment of a secure sharing apparatus for network disk files according to the present invention. The embodiment comprises the following steps: an identity information obtaining module 100, configured to obtain identity information of a sharee; a public key obtaining module 200, configured to send the identity information of the sharee to a digital certificate service in the network disk server, and receive a public key of the sharee, which is obtained by the digital certificate service through calculation based on the identity information of the sharee; the shared file encryption module 300 is configured to obtain a random file key from a file key service in the network disk server, and encrypt the shared file with the file key; a configuration file encryption module 400, configured to store the file key in a configuration file, and encrypt the configuration file through the public key; and the sharing module 500 is configured to compress the encrypted sharing file and configuration file and upload the compressed sharing file and configuration file to a network disk server for sharing.
The identity information of the shared person may be a login account, a password, or other information that can indicate an identity, such as a fingerprint.
The principle of this embodiment is the same as that of the embodiment of the method for sharing a network disk file, and the related parts can be referred to the above description, which is not repeated herein.
Compared with the existing network disk sharing mode, the public key in the embodiment is obtained based on the identity information of the sharee, the safety intensity is high, the third-party user cannot browse the shared file, the problem that the secret key is easy to leak in the transmission process is solved, and the safe sharing of the network disk file is effectively ensured
Referring to fig. 4, in order to control the usage right of the sharee, the above embodiment may be further improved, and a configuration file encryption module 600 is added for setting the sharing right of the sharee. The configuration file encryption module 600 also stores the sharing authority in the configuration file, and compresses the sharing authority and the encrypted sharing file together through a public key. The sharing authority can be read only, readable and writable, reading times, reading time limit, copy inhibition and the like.
In the embodiment, the authority management is set for the sharee, the reading authority of the sharee can be controlled, and the events of illegal copying, re-sharing, screen capturing and the like are prevented.
In conclusion, the embodiment combines the identity authentication with the key encryption, so that the security strength is high, the third-party user cannot browse the shared file, the problem that the secret key is easy to leak in the transmission process is solved, and the safe sharing of the network disk file is effectively ensured; in addition, the use authority of the sharee can be flexibly controlled.
The sharing system comprises the following embodiments:
referring to fig. 5, fig. 5 is a block diagram illustrating a structure of an embodiment of the secure sharing system for network disk files according to the present invention. The system includes a sharer-employed client 700, a sharee-employed client 800, and a web server 900.
The client 700 used by the sharer receives the identity information logged in by the sharee in the network disk server 900 and sends the identity information to the digital authentication center in the network disk server; the digital authentication center receives the identity information, obtains the public key of the sharee by using a digital signature algorithm based on the identity, and returns the public key to the client 700 used by the sharer; the client 700 used by the sharer receives the public key, sets the sharing authority of the sharee, encrypts the shared file by using a random file key acquired from the file key service center in the network disk server 900, stores the file key and the sharing authority in the configuration file, encrypts the configuration file by using the public key, and compresses and uploads the encrypted shared file and the configuration file to the network disk server 900; the network disk server 900 receives and stores the compressed file; the client 800 used by the sharee downloads the compressed file from the network disk server 900, decrypts the configuration file by using the private key of the sharee, obtains the file secret key and the sharing authority, decrypts the shared file by using the file secret key, and enjoys the file within the sharing authority range.
The information transmission between the client 700 used by the sharer, the client 800 used by the sharee and the network disk server 900 can be carried out through an HTTP or an FTP protocol so as to protect a communication link and prevent the information from being tampered by a malicious program in the transmission process. Of course, other communication protocols may be used, and the present invention is not described herein.
The client 700 used by the sharer and the client 800 used by the sharee are provided with protection measures such as process protection, registry protection, file path protection and the like, so that malicious programs are prevented from tampering information, and the client can have the functions of preventing illegal files such as copying, screen copying and screen recording according to the sharing authority configured by the system.
The following describes in detail the network disk file sharing process in this embodiment of the system with reference to fig. 6:
when a sharee needs to share files, the sharee logs in a network disk server through a client where the sharee is located, the sharee obtains identity information such as a login account number of the sharee in the network disk server through the client where the sharee is located, then the client where the sharee is located sends the identity information of the sharee to a digital certificate center in the network disk server through a secure link, the digital certificate center obtains a public key of the sharee through a digital signature algorithm based on identity identification and sends the public key back to the sharee, and the adopted digital signature algorithm can be an asymmetric algorithm such as RSA and ECC.
The sharer simultaneously obtains a random file key from a file key service in the network disk server through the secure link, wherein the file key is used for encrypting the shared file.
The sharer then sets the sharing authority for the file to be shared, and the sharing authority can be read-only, readable-writable, reading times, reading time limit, copy inhibition and the like.
The sharing rights information and the obtained file key are then stored in an XML-based configuration file and encrypted by the sharer public key.
And encrypting the shared file into a ciphertext by using the obtained file key, and then packaging the ciphertext file and the configuration file in a compressed file with a specific format, uploading the compressed file to a network disk server, and sharing the compressed file to the shared person.
The shared person downloads the compressed file from the network disk server after receiving the sharing prompt, the client used by the shared person decrypts the information in the configuration file by using the private key of the shared person, decrypts the file by using the obtained file key, and simultaneously limits the shared person to read the shared file by using the obtained sharing authority.
It should be noted that the principles of the secure sharing method, the sharing device and the sharing system for network disk files are similar, and the related points can be referred to each other.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A safe sharing method of network disk files is characterized by comprising the following steps:
an identity information acquisition step, which is to acquire the identity information of the shared person;
a public key obtaining step, namely sending the identity information of the shared person to a digital certificate service in a network disk server, and receiving the public key of the shared person calculated and obtained by the digital certificate service based on the identity information of the shared person;
a shared file encryption step, namely acquiring a random file key from a file key service in a network disk server and encrypting the shared file by using the file key;
a configuration file encryption step, storing the file secret key in a configuration file, and encrypting the configuration file through the public key;
and a sharing step, namely compressing the encrypted shared file and the encrypted configuration file and uploading the compressed shared file and the configuration file to a network disk server for sharing.
2. The method for securely sharing the network disk file according to claim 1, wherein the step of encrypting the shared file and the step of encrypting the configuration file further comprises:
a sharing authority setting step, setting the sharing authority of the shared person;
and in the step of encrypting the configuration file, the sharing authority is stored in the configuration file.
3. The method for safely sharing the network disk file according to claim 2, wherein the sharing rights comprise read-only, read-write, reading times, reading time limit and copy inhibition.
4. The method for safely sharing the network disk file according to any one of claims 1 to 3, wherein the identity information comprises a login account and a password.
5. A safe sharing device for network disk files is characterized by comprising:
the identity information acquisition module is used for acquiring the identity information of the shared person;
the public key acquisition module is used for sending the identity information of the shared person to a digital certificate service in the network disk server and receiving the public key of the shared person calculated and acquired by the digital certificate service based on the identity information of the shared person;
the shared file encryption module is used for acquiring a random file key from a file key service in the network disk server and encrypting the shared file by using the file key;
the configuration file encryption module is used for storing the file secret key in a configuration file and encrypting the configuration file through the public key;
and the sharing module is used for compressing the encrypted sharing file and the encrypted configuration file and uploading the compressed sharing file and the configuration file to a network disk server for sharing.
6. The device for securely sharing a network disk file according to claim 5, further comprising:
the sharing authority setting module is used for setting the sharing authority of the shared person;
the configuration file encryption module also stores the sharing permission in a configuration file.
7. The device for securely sharing a network disk file according to claim 6, wherein the sharing rights include read-only, read-write, read times, read time limit, and copy inhibition.
8. A safe sharing system of network disk files is characterized by comprising a client used by a sharer, a client used by a sharee and a network disk server; wherein,
the client used by the sharer receives the identity information logged in by the sharer in the network disk server and sends the identity information to a digital authentication center in the network disk server;
the digital authentication center receives the identity information, obtains a public key of the sharee based on a digital signature algorithm of the identity, and returns the public key to the client used by the sharer;
the client used by the sharer receives the public key, sets the sharing authority of the sharer, encrypts the shared file by using a random file key acquired from a file key service in the network disk server, stores the file key and the sharing authority in a configuration file, encrypts the configuration file by using the public key, and compresses and uploads the encrypted shared file and the configuration file to the network disk server;
the network disk server receives and stores the compressed file;
the client used by the sharee downloads the compressed file from the network disk server, decrypts the configuration file by using the private key of the sharee, acquires the file secret key and the sharing authority, decrypts the shared file by using the file secret key, and enjoys the file in the sharing authority range.
9. The system according to claim 8, wherein the information transmission between the client used by the sharer, the client used by the sharee and the network disk server is performed by HTTP or FTP protocol.
10. The system for securely sharing a network disk file according to claim 8 or 9, wherein the client used by the sharer and the client used by the sharee are each installed with process protection, registry protection and file path protection.
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