CN109194663A - A kind of method and device of file storage and downloading based on cloud computing - Google Patents
A kind of method and device of file storage and downloading based on cloud computing Download PDFInfo
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- CN109194663A CN109194663A CN201811069596.5A CN201811069596A CN109194663A CN 109194663 A CN109194663 A CN 109194663A CN 201811069596 A CN201811069596 A CN 201811069596A CN 109194663 A CN109194663 A CN 109194663A
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- key
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- cipher text
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- cloud computing
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Classifications
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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]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
- H04L9/0643—Hash functions, e.g. MD5, SHA, HMAC or f9 MAC
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0819—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
- H04L9/0822—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s) using key encryption key
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Power Engineering (AREA)
- Computer Hardware Design (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Storage Device Security (AREA)
Abstract
The method for the file storage based on cloud computing that the invention discloses a kind of, comprising: when storage file, first key is generated by random key generating algorithm, plaintext document is converted to file cipher text using first key；The first key is encrypted to obtain the second key；Second key and file cipher text binding are stored.The invention also discloses a kind of method and devices of file download based on cloud computing.This programme is while protecting personal data safety, simple flexible convenient for the management, update and maintenance of key.
Description
Technical field
The present invention relates to cloud storage technology, the method and device of espespecially a kind of file storage and downloading based on cloud computing.
Background technique
Personal cloud computing is extension of the cloud computing in personal field, is the personal letter centered on Internet (internet)
Breath processing carries out tissue, storage, distribution and reprocessing to personal various information by Internet.Personal information is private
Have, it is higher to security requirement.Individual possesses the multimedia messages such as a large amount of picture, video, it is desirable that amount of storage is big and can be with
Extension, and computing capability is required not strong.With the popularity of the internet, personal cloud computing will grow into same with enterprise cloud computing
The universal service of sample.For personal user, the advantage of cloud computing is quite obvious: cheap or even free, safety, without no
It is taken on demand in, performance.Currently, personal user concerns cloud computing technology data are uploading to cloud computing clothes the most
Safety after business device, no one wishes that the privacy (such as the private informations such as photo, diary) of oneself is clear as the public after all
Look at the object of propagation.The best method for protecting secure user data is exactly to use encryption technology, studies reasonable suitable personal cloud
The key managing project of data storage characteristics is particularly important in calculating.
At present there are some drawbacks in the key management method of mainstream in actual use, be mainly reflected in following a few sides
Face: first is that issuing digital certificate to all users using digital certificate mode, file is encrypted using symmetric key, and right
Key is claimed to need to be obtained according to corresponding private key to decrypt when user accesses file by the public key encryption storage in digital certificate
Symmetric key is obtained, and then decrypts file.Since the private key inconvenience user of digital certificate remembers, user needs to carry private key
Data file can be just accessed in (such as there are in USB flash disk), be not suitable for the demand that individual cloud user accesses cloud whenever and wherever possible.Second is that adopting
With single symmetric key encryption All Files, for example login username and password are utilized, passes through certain algorithm and generate one
Symmetric key encrypts all user files using the key.This method is realized simply, and the user name and password facilitates user
Memory, do not need to safeguard more information yet, once but symmetric key leak, All Files are all dangerous, can at any time by
Decryption；When user wishes to replace the user name and password, need to carry out re-encrypted to All Files with new key, workload is huge
Greatly；Third is that encrypting file by the way of one-time pad, different files is encrypted using different keys, a key only makes
With primary.This method can greatly improve the safety of data file, only threaten leaking part of key and use these
The file security of key encryption, however the number of files stored beyond the clouds is numerous, personal user can not remember all keys, cloud
Server must safeguard " file-key " table of comparisons, for which the corresponding key encryption of which file to be recorded.Once close
The damage of key table is non-readable, then means that all encryption files of user cannot be opened, loss will be very heavy.
Summary of the invention
The method of in order to solve the above-mentioned technical problems, the present invention provides a kind of file storage and downloading based on cloud computing
And device, to improve personal cloud computing data security and property convenient for management.
In order to reach the object of the invention, the method for the file storage based on cloud computing that the present invention provides a kind of, comprising:
When storage file, first key is generated by random key generating algorithm, is turned plaintext document using first key
It is melted into file cipher text；
The first key is encrypted to obtain the second key；
Second key and file cipher text binding are stored.
It is further, described to encrypt the first key to obtain the second key, comprising:
The user name and user's entry password inputted when by logging in system by user carries out Hash operation, by operation result
Data are encrypted to obtain second key as first key described in key pair.
Further, it is described by second key and the file cipher text binding stored during, further includes:
The file cipher text is marked.
A kind of device of the file storage based on cloud computing, wherein include:
First encrypting module after the instruction for receiving storage file, generates first by random key generating algorithm
Plaintext document is converted to file cipher text using first key by key；
Second encrypting module obtains the second key for encrypting the first key；
Memory module, for storing second key and file cipher text binding.
Further, second encrypting module, by the first key encrypt to obtain the second key include: by with
The user name and user's entry password inputted when the login system of family carries out Hash operation, using operation result data as key pair institute
First key is stated to be encrypted to obtain second key.
Further, second key and the file cipher text are bound the process stored by the memory module
In, it is also used to that the file cipher text is marked.
A method of the file download based on cloud computing, comprising:
It when downloading file, such as determines that file to be downloaded is file cipher text, then will extract the from the file cipher text
Two keys are decrypted to obtain first key to second key；
The file cipher text is decrypted to obtain plaintext document by the first key；
The plaintext document is downloaded.
Further, determination file to be downloaded is that file cipher text is achieved in the following ways:
By read carried in the file cipher text for mark whether be ciphertext label.
It is further, described that second key is decrypted to obtain first key, comprising:
Second key is decrypted to obtain first key by user name and user's entry password.
A kind of device of the file download based on cloud computing, comprising:
First deciphering module when for downloading file, such as determines that file to be downloaded is file cipher text, then will be from the text
The second key is extracted in part ciphertext, and second key is decrypted to obtain first key；
Second deciphering module, for being decrypted to obtain plaintext document to the file cipher text by the first key；
Download module, for being downloaded to the plaintext document.
Further, first deciphering module is decrypted to obtain first key, comprising: pass through use to second key
Name in an account book and user's entry password are decrypted to obtain first key to second key.
The scheme of the embodiment of the present invention, while protecting personal data safety, convenient for the management, update and dimension of key
Shield, it is simple flexible.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by specification, right
Specifically noted structure is achieved and obtained in claim and attached drawing.
Detailed description of the invention
Attached drawing is used to provide to further understand technical solution of the present invention, and constitutes part of specification, with this
The embodiment of application technical solution for explaining the present invention together, does not constitute the limitation to technical solution of the present invention.
Fig. 1 is a kind of flow chart of the method for file storage based on cloud computing of the embodiment of the present invention；
Fig. 2 is the flow chart of the encryption file of the embodiment of the present invention；
Fig. 3 is the flow chart of the encryption key of the embodiment of the present invention；
Fig. 4 is the schematic diagram of the format of the plaintext document of the embodiment of the present invention；
Fig. 5 is the schematic diagram of the format of the file cipher text of the embodiment of the present invention；
Fig. 6 is a kind of schematic diagram of the device of file storage based on cloud computing of the embodiment of the present invention；
Fig. 7 is a kind of flow chart of the method for file download based on cloud computing of the embodiment of the present invention；
Fig. 8 is a kind of schematic diagram of the device of file download based on cloud computing of the embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention
Embodiment be described in detail.It should be noted that in the absence of conflict, in the embodiment and embodiment in the application
Feature can mutual any combination.
Step shown in the flowchart of the accompanying drawings can be in a computer system such as a set of computer executable instructions
It executes.Also, although logical order is shown in flow charts, and it in some cases, can be to be different from herein suitable
Sequence executes shown or described step.
Fig. 1 is a kind of flow chart of the method for file storage based on cloud computing of the embodiment of the present invention, as shown in Figure 1,
The method of the present embodiment includes:
When step 101, storage file, first key is generated by random key generating algorithm, it will be literary using first key
Part is converted to file cipher text in plain text；
Step 102 encrypts the first key to obtain the second key；
Step 103 stores second key and file cipher text binding.
The method of the present embodiment realizes the one-time pad of file, and the first key for encrypting each file is different.Portion
The leakage for dividing first key, only influences whether the file security encrypted with these first keys, does not constitute to alternative document
It threatens.
The embodiment of the present invention proposes a kind of method of file storage based on cloud computing, has both ensured that personal data were pacified
Entirely, and convenient for management, update and the maintenance of key.
The method that the embodiment of the present invention proposes is suitble to the key management of personal cloud computing, and key is carried out binding with file and is deposited
Storage, does not need the maintenance key table of comparisons.For convenience, arrange several sign flags: Plaintext: plaintext document in advance,
Cipher: file cipher text, Username: user login name, Password: user's entry password, Hash (): hash function fortune
It calculates, key: key plain (that is, first key above), KEY: key ciphertext (that is, second key above),
Ek (): being encrypted using symmetric key k, Dk (): operation is decrypted using symmetric key k, | |: series connection.
In the present embodiment, for needing to carry out to encrypt the file of storage beyond the clouds, pass through one first for personal user
Random key generating algorithm generates key key, and plaintext document Plaintext is converted to file by Encryption Algorithm using key
Ciphertext Cipher, as shown in Figure 2.
Key key and file are subjected to binding storage, therefore key must be encrypted before storing.Pass through
The Username and Password that input when to logging in system by user carry out hash (Hash) operation, using operation result data as
Key encrypts key to obtain KEY, as shown in Figure 3.
In the present embodiment, the storage format of cloud file can be divided into two classes: 1. for the file of stored in clear, according to figure
4 formats are stored；2. for security consideration, the file for needing ciphertext to store is stored according to Fig. 5 format.
First bit 0 of storage format indicates file with stored in clear；If 1, indicate that file is stored with ciphertext.Work as text
When part is stored with ciphertext form, need to increase encrypted secret key KEY before ciphertext, 2 bytes are used to indicate the significant figure of file
According to length.
The method of the present embodiment, personal user do not need to carry the equipment (such as USB flash disk) of storage key, need to only remember
The system login the user name and password of oneself setting facilitates user to access personal cloud data whenever and wherever possible.
When user needs periodically change login username and password, to the existing encryption file of personal cloud, it is only necessary to according to
KEY is replaced according to newly-installed the user name and password, workload is smaller, influences on system performance little.
Correspondingly, the present embodiment additionally provides a kind of device of file storage based on cloud computing, as shown in fig. 6, this reality
The device 600 for applying example may include:
First encrypting module 601 after the instruction for receiving storage file, generates the by random key generating algorithm
Plaintext document is converted to file cipher text using first key by one key；
Second encrypting module 602 obtains the second key for encrypting the first key；
Memory module 603, for storing second key and file cipher text binding.
The device of the present embodiment realizes the one-time pad of file, and the first key for encrypting each file is different.Portion
The leakage for dividing first key, only influences whether the file security encrypted with these first keys, does not constitute to alternative document
It threatens.The embodiment of the present invention proposes a kind of device of file storage based on cloud computing, not only ensures personal data safety, but also
Convenient for the management, update and maintenance of key.
In one embodiment, second encrypting module 602, encrypt the first key to obtain the second key include:
The user name and user's entry password that input when by logging in system by user carry out Hash operation, using operation result data as
First key described in key pair is encrypted to obtain second key.
The device of the present embodiment, personal user do not need to carry the equipment (such as USB flash disk) of storage key, need to only remember
The system login the user name and password of oneself setting facilitates user to access personal cloud data whenever and wherever possible.
In one embodiment, the memory module 603 stores second key and file cipher text binding
During, it can be also used for that the file cipher text is marked.
Fig. 7 is a kind of flow chart of the method for file download based on cloud computing of the embodiment of the present invention, as shown in fig. 7,
The method of the present embodiment includes:
When step 701, downloading file, such as determine that file to be downloaded is file cipher text, then it will be from the file cipher text
The second key is extracted, second key is decrypted to obtain first key；
Step 702 is decrypted to obtain plaintext document by the first key to the file cipher text；
Step 703 is downloaded the plaintext document.
The method of the embodiment of the present invention can not only ensure the data safety in personal cloud, and realize simple, calculation amount
It is low.
In the present embodiment, when user is from cloud downloading data, the first bit of file is first determined whether, if 0, indicate text
Part is stored in clear, is directly downloaded；If 1, then system extracts KEY, inverse according to Fig. 3 by Username and Password
Key is obtained to decryption, then inversely decrypts Cipher according to Fig. 2 and obtains Plaintext.
In the present embodiment, the one-time pad of file is realized, the key key for encrypting each file is different.Part key
Leakage, only influence whether the file security encrypted with these key, do not constitute a threat to alternative document.
Correspondingly, the embodiment of the invention also provides a kind of devices of file download based on cloud computing, as shown in figure 8,
The device 800 of the present embodiment includes:
First deciphering module 801 when for downloading file, such as determines that file to be downloaded is file cipher text, then will be from institute
It states and extracts the second key in file cipher text, second key is decrypted to obtain first key；
Second deciphering module 802, it is bright for being decrypted to obtain file to the file cipher text by the first key
Text；
Download module 803, for being downloaded to the plaintext document.
The device of the embodiment of the present invention can not only ensure the data safety in personal cloud, and realize simple, calculation amount
It is low.
In one embodiment, first deciphering module 801 is decrypted to obtain first key to second key, comprising:
Second key is decrypted to obtain first key by user name and user's entry password.
The embodiment of the present invention also provides a kind of device of file storage and downloading based on cloud computing, including processor and meter
Calculation machine readable storage medium storing program for executing is stored with instruction in the computer readable storage medium, wherein when described instruction is by the processing
When device executes, the method that the above-mentioned file based on cloud computing is stored and downloaded is realized.
The embodiment of the invention also provides a kind of computer readable storage mediums, are stored with computer executable instructions,
The computer executable instructions are performed the method for realizing the file storage and downloading based on cloud computing.
It will appreciated by the skilled person that whole or certain steps, system, dress in method disclosed hereinabove
Functional module/unit in setting may be implemented as software, firmware, hardware and its combination appropriate.In hardware embodiment,
Division between the functional module/unit referred in the above description not necessarily corresponds to the division of physical assemblies；For example, one
Physical assemblies can have multiple functions or a function or step and can be executed by several physical assemblies cooperations.Certain groups
Part or all components may be implemented as by processor, such as the software that digital signal processor or microprocessor execute, or by
It is embodied as hardware, or is implemented as integrated circuit, such as specific integrated circuit.Such software can be distributed in computer-readable
On medium, computer-readable medium may include computer storage medium (or non-transitory medium) and communication media (or temporarily
Property medium).As known to a person of ordinary skill in the art, term computer storage medium is included in for storing information (such as
Computer readable instructions, data structure, program module or other data) any method or technique in the volatibility implemented and non-
Volatibility, removable and nonremovable medium.Computer storage medium include but is not limited to RAM, ROM, EEPROM, flash memory or its
His memory technology, CD-ROM, digital versatile disc (DVD) or other optical disc storages, magnetic holder, tape, disk storage or other
Magnetic memory apparatus or any other medium that can be used for storing desired information and can be accessed by a computer.This
Outside, known to a person of ordinary skill in the art to be, communication media generally comprises computer readable instructions, data structure, program mould
Other data in the modulated data signal of block or such as carrier wave or other transmission mechanisms etc, and may include any information
Delivery media.
Claims (11)
1. a kind of method of the file storage based on cloud computing characterized by comprising
When storage file, first key is generated by random key generating algorithm, is converted to plaintext document using first key
File cipher text；
The first key is encrypted to obtain the second key；
Second key and file cipher text binding are stored.
2. the method according to claim 1, wherein described encrypt the first key to obtain the second key,
Include:
The user name and user's entry password inputted when by logging in system by user carries out Hash operation, by operation result data
It is encrypted to obtain second key as first key described in key pair.
3. method according to claim 1 or 2, which is characterized in that described by second key and the file cipher text
During binding is stored, further includes:
The file cipher text is marked.
4. a kind of device of the file storage based on cloud computing characterized by comprising
First encrypting module after the instruction for receiving storage file, generates first key by random key generating algorithm,
Plaintext document is converted to file cipher text using first key；
Second encrypting module obtains the second key for encrypting the first key；
Memory module, for storing second key and file cipher text binding.
5. device according to claim 4, which is characterized in that
Second encrypting module, by the first key encrypt to obtain the second key include: by logging in system by user when
The user name and user's entry password of input carry out Hash operation, using operation result data as first key described in key pair into
Row encryption obtains second key.
6. device according to claim 4 or 5, which is characterized in that
The memory module is also used to during being stored second key and file cipher text binding to institute
File cipher text is stated to be marked.
7. a kind of method of the file download based on cloud computing characterized by comprising
When downloading file, such as determine that file to be downloaded is file cipher text, then it is close to extract second from the file cipher text
Key is decrypted to obtain first key to second key；
The file cipher text is decrypted to obtain plaintext document by the first key；
The plaintext document is downloaded.
8. the method according to the description of claim 7 is characterized in that it is to pass through that determination file to be downloaded, which is file cipher text,
What following manner was realized:
By read carried in the file cipher text for mark whether be ciphertext label.
9. the method according to the description of claim 7 is characterized in that described decrypt to obtain first key to second key,
Include:
Second key is decrypted to obtain first key by user name and user's entry password.
10. a kind of device of the file download based on cloud computing characterized by comprising
First deciphering module when for downloading file, such as determines that file to be downloaded is file cipher text, then will be close from the file
The second key is extracted in text, and second key is decrypted to obtain first key；
Second deciphering module, for being decrypted to obtain plaintext document to the file cipher text by the first key；
Download module, for being downloaded to the plaintext document.
11. device according to claim 10, which is characterized in that
First deciphering module is decrypted to obtain first key to second key, comprising: is logged in by user name and user
Password is decrypted to obtain first key to second key.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811069596.5A CN109194663A (en) | 2018-09-13 | 2018-09-13 | A kind of method and device of file storage and downloading based on cloud computing |
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| CN201811069596.5A CN109194663A (en) | 2018-09-13 | 2018-09-13 | A kind of method and device of file storage and downloading based on cloud computing |
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| CN201811069596.5A Pending CN109194663A (en) | 2018-09-13 | 2018-09-13 | A kind of method and device of file storage and downloading based on cloud computing |
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| CN113553611A (en) * | 2020-04-26 | 2021-10-26 | 中国电信股份有限公司 | File encryption storage method and system, user terminal, cloud platform and storage medium |
| CN114697007A (en) * | 2020-12-29 | 2022-07-01 | 华为技术有限公司 | Method, corresponding device and system for managing secret key |
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| CN104917759A (en) * | 2015-05-26 | 2015-09-16 | 西安电子科技大学 | Third-party-based safety file storage and sharing system and method |
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| CN113553611A (en) * | 2020-04-26 | 2021-10-26 | 中国电信股份有限公司 | File encryption storage method and system, user terminal, cloud platform and storage medium |
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Application publication date: 20190111 |
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| RJ01 | Rejection of invention patent application after publication |