CN102456116B - File encryption method, file decryption method and devices - Google Patents
File encryption method, file decryption method and devices Download PDFInfo
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- CN102456116B CN102456116B CN201010527367.0A CN201010527367A CN102456116B CN 102456116 B CN102456116 B CN 102456116B CN 201010527367 A CN201010527367 A CN 201010527367A CN 102456116 B CN102456116 B CN 102456116B
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Abstract
The invention discloses a file encryption method, a file decryption method, a file encryption device, a file decryption device and a file encryption/decryption system, wherein the file encryption method comprises the following steps of: obtaining a file to be encrypted; and when the length of the file head of the file to be encrypted reaches a threshold, encrypting the file head of the file so that the file to be encrypted is mapped into an encrypted file. In the file encryption method provided in the invention, when the length of the file head of the file to be encrypted reaches the threshold, the file is not integrally encrypted, but only the file head of the file is encrypted; therefore, the problems of long time-consuming and low efficiency caused by integrally encrypting a large file by the existing file encryption method are solved. Besides, the file head of the file comprises basic attribute information such as the format information and the like of the file; however, after the file head is encrypted, even though the file is obtained by an illegal user, the format of the file cannot be known by the illegal user because the file head is the encrypted file head; as a result, the file cannot be read.
Description
Technical field
The present invention relates to field of information security technology, more particularly, relate to a kind of file encrypting method, decryption method and device.
Background technology
Now, for the threat of the security of system on computing machine from from all directions, hacker and wooden horse are difficult to estimate to the loss that enterprise brings, and for this reason, need the file to storing in a computer tightly to protect.
Generally, be the security of abundant safeguard file information, usually will carry out entirety encryption to file.The method can fully be useful in file less when because to file carry out entirety encryption can't consume the long time.
But, in the situation that file is larger, adopt the method for file entirety encryption will consume the longer time, can the serious treatment effeciency reducing file.
Summary of the invention
In view of this, the invention provides a kind of file encrypting method, decryption method and device, to solve to large files, consuming time longer, problem that efficiency is lower that existing file encrypting method carries out that overall encryption causes.
For solving the problem, the existing technical scheme proposed is as follows:
A kind of file encrypting method, comprising:
Obtain file to be encrypted;
When the file header length of described file to be encrypted reaches threshold value, encrypt the file header of this file, make described file to be encrypted form encrypt file.
Preferably, described file encrypting method also comprises: when the file header length of described file to be encrypted does not reach threshold value, adopts file to be encrypted described in symmetry encryption algorithm or unsymmetrical tridiagonal matrix algorithm for encryption.
Preferably, described file header adopts symmetry encryption algorithm or unsymmetrical tridiagonal matrix algorithm for encryption.
Preferably, after described encrypt file head, also comprise: the extended attribute of length value to described encrypt file preserving described encrypt file head.
Preferably, after preserving the length value of described file header, also comprise the extended attribute encrypting described file.
A kind of file decryption method, comprising:
Obtain encrypt file;
The file header of enabling decryption of encrypted file, makes encrypt file decipher as source document.
Preferably, before described declassified document head, also comprise:
The encryption length value of the file header of described encrypt file is obtained in the extended attribute of described encrypt file;
Calculate the side-play amount of this file header, determine the length value after the encryption of described file header in conjunction with described file header encryption length value.
Preferably, before the encryption length of the file header of the described encrypt file of described acquisition, also comprise the extended attribute deciphering described encrypt file.
A kind of document encrypting apparatus, comprising:
File obtaining unit, for obtaining file to be encrypted;
Ciphering unit, for when the file header length of described file to be encrypted reaches threshold value, encrypts the file header of this file.
Preferably, described encryption device also comprises:
File header length storage unit, for after encryption file to be encrypted is encrypt file, preserves the extended attribute of length value to described encrypt file of described file header.
A kind of file deciphering device, comprising:
File obtaining unit, for obtaining encrypt file;
Decryption unit, for deciphering the file header of described encrypt file, makes encrypt file decipher as source document.
Preferably, described decryption device also comprises:
File header length acquiring unit, for obtaining the encryption length value of the file header of described encrypt file in the extended attribute of described encrypt file;
File header offset computation unit, for calculating the side-play amount of this file header, determines the length value after the encryption of described file header in conjunction with described file header encryption length value.
A kind of document storage system, comprising:
First file obtaining unit, for obtaining source document;
File header length determining unit, for judging whether the file header length of described source document reaches threshold value;
Ciphering unit, comprises the first encrypting module, for when judging that the file header length of described source document reaches threshold value, encrypts the file header of this file, makes described source document form encrypt file;
File storage unit, for storing described encrypt file;
Second file obtaining unit, during for accessing this document transmission system acquisition data as user, obtains the encrypt file in described file storage unit;
Decryption unit, comprises the first deciphering module, for deciphering the file header of described encrypt file, encrypt file is deciphered as source document.
Preferably, described ciphering unit also comprises the second encrypting module, for when judging that the file header length of described source document does not reach threshold value, encrypts this file, makes described source document form encrypt file;
Described decryption unit also comprises the second deciphering module, is source document for deciphering described encrypt file.
As can be seen from above-mentioned technical scheme, in file encrypting method disclosed by the invention, when the length of file header reaches predetermined threshold value, entirety encryption is not carried out to file, and the file header of only encrypt file, solve to large files, consuming time longer, problem that efficiency is lower that existing file encrypting method carries out that overall encryption causes.
Further, owing to comprising the base attribute information such as documentary format information in the file header of file, after encrypt file head, even if after disabled user acquires file, due to the file header that file header is encryption, disabled user cannot learn the form of file, cannot file reading.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The process flow diagram of Fig. 1 a kind of file encrypting method disclosed in the embodiment of the present invention;
The process flow diagram of Fig. 2 a kind of file encrypting method disclosed in another embodiment of the present invention;
The structural representation of Fig. 3 a kind of document encrypting apparatus disclosed in the embodiment of the present invention;
The structural representation of Fig. 4 another kind of document encrypting apparatus disclosed in the embodiment of the present invention;
The process flow diagram of Fig. 5 a kind of file decryption method disclosed in the embodiment of the present invention;
The process flow diagram of Fig. 6 a kind of file decryption method disclosed in another embodiment of the present invention;
The structural representation of Fig. 7 a kind of file deciphering device disclosed in the embodiment of the present invention;
The structural representation of Fig. 8 another kind of file deciphering device disclosed in the embodiment of the present invention;
The structural representation of Fig. 9 a kind of document storage system disclosed in the embodiment of the present invention;
The structural representation of Figure 10 a kind of document storage system disclosed in another embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the invention discloses a kind of file encrypting method, decryption method and device, to solve to file, consuming time longer, problem that efficiency is lower that existing file encrypting method carries out that overall encryption causes.
Respectively file encrypting method, device are described in detail below by way of three embodiments.
As described in Figure 1, file encrypting method disclosed in the present embodiment, comprising:
Step S11, obtain file to be encrypted;
Step S12, when the file header length of described file to be encrypted reaches threshold value, encrypt the file header of this file, make described file to be encrypted form encrypt file.
In file encrypting method disclosed in the present embodiment, when the length of file header reaches threshold value, entirety encryption is not carried out to file, and the file header of only encrypt file, solve to large files, consuming time longer, problem that efficiency is lower that existing file encrypting method carries out that overall encryption causes.
And; owing to comprising the base attribute information such as documentary format information in the file header of file; after encrypt file head; even if after disabled user acquires file; due to the file header that file header is encryption; disabled user cannot learn the form of file, cannot file reading, serves protected file equally by the effect of illegally reading.
Another embodiment of the present invention also discloses a kind of file encrypting method, as shown in Figure 2, comprising:
Step S21, obtain file to be encrypted;
Step S22, judge whether the file header length of described file to be encrypted reaches threshold value, if reach, then perform step S23, encrypt the file header of this file, make described File Mapping to be encrypted be encrypt file; Otherwise perform step S24, adopt file to be encrypted described in symmetry encryption algorithm or unsymmetrical tridiagonal matrix algorithm for encryption.
Concrete, file comprises file header and file content part, and along with the continuous writing in files of data, file content part increases, and meanwhile, the length of file header also can increase.Determine to need to encrypt whole file or the file header of file and the threshold value used specifically can be set by the user, user can carry out repeatedly file entirety encryption test, when judging that the capacity of file is much, encrypts the consuming time longer of overall file, efficiency is lower, obtains the length threshold of file header.
When the length of file header is less than threshold value, just directly can carry out entirety encryption to file, File Mapping to be encrypted is formed encrypt file, when the length of file header is equal to, or greater than threshold value, now, if carry out entirety encryption to file, consuming time just longer, therefore, only file header is encrypted, equally, the file to be encrypted that file header is encrypted forms encrypt file equally.
Concrete, file header cipher mode is identical with the overall cipher mode of file, can adopt symmetry encryption algorithm or rivest, shamir, adelman.
Wherein, described symmetry encryption algorithm refers to that encryption key and decruption key are the algorithm of same key; The encryption key that described rivest, shamir, adelman uses and decruption key are different, so be called asymmetric, two keys one are made public, and are called PKI, and another, by deciphering person oneself keeping, is called private key.The data of public key encryption can only be deciphered by the private key of correspondence.Rivest, shamir, adelman is a kind of fool proof effective cryptographic algorithm, and the ciphertext generated by this algorithm for encryption, is difficult to crack under foreseeable technical conditions, thus ensure that the security of ciphertext in transmitting procedure.
In file encrypting method disclosed in above-mentioned two embodiments, cryptographic algorithm is adopted to encrypt the file header of file to be encrypted, file header length after may causing encryption is not identical with the file header length before unencryption, now, after the file header encryption of described file to be encrypted, the length value of this file header can be saved in the extended attribute of described encrypt file.
Further, in order to ensure the security of the file header length value of encrypt file, can also be encrypted the extended attribute of described file to be encrypted, equally, this cryptographic algorithm can be symmetry encryption algorithm or unsymmetrical tridiagonal matrix algorithm for encryption, not concrete restriction.
Another embodiment of the present invention also discloses a kind of document encrypting apparatus, as shown in Figure 3, comprising: file obtaining unit 101 and ciphering unit 102, wherein:
File obtaining unit 101 is for obtaining file to be encrypted;
Ciphering unit 102, for when the file header length of described file to be encrypted reaches threshold value, encrypts the file header of this file.
When the file header length of described file to be encrypted does not reach threshold value, ciphering unit 102 directly can also encrypt file to be encrypted, and method is identical with encryption method of the prior art, repeats no more herein.
Concrete, the ciphering unit of this document encrypting apparatus adopts the file header of rivest, shamir, adelman or symmetry encryption algorithm for encryption file to be encrypted.
As shown in Figure 4, document encrypting apparatus disclosed in the present embodiment, also comprises file header length storage unit 103, for after encryption file to be encrypted is encrypt file, obtains file header length value, is saved in the extended attribute of described encrypt file.
Document encrypting apparatus disclosed in this embodiment implements file encrypting method disclosed in above-mentioned two embodiments, specifically refers to content disclosed in above-mentioned file encrypting method, repeats no more herein.
Respectively file decryption method, device are described in detail below by way of three embodiments.
As shown in Figure 5, described file decryption method comprises:
Step S41, acquisition encrypt file;
Step S42, decipher the file header of described encrypt file, encrypt file is deciphered as source document.
When user needs to obtain the data in preservation file content part hereof time, need to be decrypted operation to the file of encryption.
Concrete, when the file header length of file does not reach threshold value, when adopting the mode encrypt file of file entirety encryption, the decryption method of encrypt file is identical with decryption method of the prior art, repeats no more herein.File decryption method disclosed in above-described embodiment is the decryption method of encrypt file head.
As content disclosed in above-mentioned encryption method embodiment is identical, after the file header encryption of file to be encrypted, the length of file header may be different from the length of the file header of source document, therefore, the file header length value of file to be encrypted is stored, i.e. the encryption length of file header in the extended attribute of encrypt file.
Therefore, another embodiment of the present invention also discloses a kind of file decryption method, as shown in Figure 6, comprising:
Step S51, acquisition encrypt file;
Step S52, in the extended attribute of described encrypt file, obtain the encryption length value of the file header of described encrypt file;
Step S53, calculate the side-play amount of this file header, determine the length value after the encryption of described file header in conjunction with described file header encryption length value;
The file header of the encrypt file of length is determined in step S54, deciphering, and encrypt file is deciphered as source document.
Encrypt file in this embodiment, symmetry encryption algorithm or unsymmetrical tridiagonal matrix algorithm for encryption is adopted to obtain, therefore, the decryption method of encrypt file file header disclosed in the present embodiment is corresponding with the cryptographic algorithm adopted during encryption, because decryption method is identical with existing decryption method, for known technology, so just repeat no more herein.
But, as described in foregoing, after file header encryption, length may change, during deciphering, the length of file header after need determining to encrypt, therefore, from the extended attribute of file, first obtain the file header encryption length of file, calculate the side-play amount of file header again, both combine obtain file header encryption after length, now, adopt the file header determining this length, obtain source document with regard to enabling decryption of encrypted file.
Wherein, the side-play amount of file header specifically refers to the skew between the file header length of source document and the file header length of encrypt file, and on the basis of the file header length of source document, the side-play amount of plus-minus file header can obtain the file header length of encrypt file.
Another embodiment of the present invention also discloses a kind of file deciphering device, as shown in Figure 7, comprising: file obtaining unit 201 and decryption unit 202, wherein:
File obtaining unit 201 is for obtaining encrypt file;
Decryption unit 202, for deciphering the file header of described encrypt file, makes encrypt file decipher as source document.
The decryption unit 202 of decryption device disclosed in the present embodiment can also be deciphered and be treated encrypt file and carry out overall encrypting the encrypt file obtained, and method is identical with the decryption method of prior art, repeats no more herein.
As shown in Figure 8, disclosed in the present embodiment, file deciphering device also comprises: file header length acquiring unit 203 and file header offset computation unit 204, wherein:
File header length acquiring unit 203 for obtaining the encryption length value of the file header of described encrypt file in the extended attribute of described encrypt file.
File header offset computation unit 204, for calculating the side-play amount of this file header, determines the length value after the encryption of described file header in conjunction with described file header encryption length value.
After file header offset computation unit 204 obtains the length value after file header encryption, transmit it to decryption unit 202, the encrypt file head of decryption unit 202 to this length is encrypted operation.
Another embodiment of the present invention also discloses a kind of document storage system, as shown in Figure 9, comprise: the first file obtaining unit 301, file header length determining unit 302, ciphering unit 303, file storage unit 304, second file obtaining unit 305 and decryption unit 306, wherein:
First file obtaining unit 301 is for obtaining source document;
File header length determining unit 302 is for judging whether the file header length of described source document reaches threshold value;
Ciphering unit 303 comprises the first encrypting module, for when the file header length of described source document reaches threshold value, encrypts the file header of this file, makes described source document form encrypt file;
File storage unit 304 is for storing described encrypt file;
When second file obtaining unit 305 is for accessing this document transmission system as user and obtaining data, obtain the encrypt file in file storage unit 304;
Decryption unit 306 comprises the first deciphering module, for deciphering the file header of described encrypt file, encrypt file is deciphered as source document.Document storage system disclosed in the present embodiment can be arranged in computer system, obtains the file in this system, is stored after encryption.
Concrete, first file obtaining unit 301 constantly obtains the source document in computer system, it can be used as file to be encrypted, the threshold value of file header length determining unit 302 comparison File head to be encrypted length value and pre-stored, when judging that this file header length reaches threshold value, the first encrypting module in ciphering unit 302 encrypts the file header of this file, makes described source document form encrypt file, and is kept in file storage unit 303.When user accesses this computer system, specifically access document storage system disclosed in the present embodiment, and when obtaining the encrypt file stored in this system, second file obtaining unit 304 obtains the encrypt file stored in file storage unit 303, and user can export decruption key to decryption unit 305, and the first deciphering module of decryption unit 305 is according to the file header of decryption key decryption encrypt file, obtain source document, now, user just can access file, obtains the data in file.
Another embodiment of the present invention also discloses a kind of document storage system, as shown in Figure 10, with document storage system disclosed in above-described embodiment unlike, ciphering unit 303 also comprises the second encrypting module, when file header length determining unit 302 judges that the file header length of source document does not reach threshold value, encrypt file, makes source document form encrypt file, equally, this encrypt file is stored in file storage unit 303; Decryption unit 305 also comprises the second deciphering module, and when the file that the second file obtaining unit 304 obtains is the encrypt file encrypting whole file, deciphering this encrypt file is source document.
Concrete, decryption unit 305 judges the encrypted location of the file that the second file obtaining unit 304 obtains, if it is the encrypt file of encrypt file head, is then deciphered by the first deciphering module; If it is the encrypt file encrypting whole file, then deciphered by the second deciphering module.
In sum, in file encrypting method, device and file encryption-decryption system disclosed in the above embodiment of the present invention, the file exceeding threshold value to file header length all adopts the encryption method of encrypt file head, and data volume of its encryption is little, can adopt the cryptographic algorithm of high strength.
Further, user, for before visit data, only need provide decruption key, and file deciphering device automatically just can enabling decryption of encrypted file, simple to operation.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. a file encrypting method, is characterized in that, comprising:
Obtain file to be encrypted;
Judge whether the file header length of described file to be encrypted reaches threshold value;
If the length of file header reaches threshold value, then entirety encryption is not carried out to file, and the file header of only encrypt file; If the length of file header does not reach threshold value, then entirety encryption is carried out to file;
After the file header encryption of described file to be encrypted, the length value of this file header is saved in the extended attribute of described encrypt file;
After in the extended attribute length value of this file header being saved to described encrypt file, encrypt the extended attribute of described file.
2. method according to claim 1, is characterized in that, also comprises: when the file header length of described file to be encrypted does not reach threshold value, adopts file to be encrypted described in symmetry encryption algorithm or unsymmetrical tridiagonal matrix algorithm for encryption.
3. method according to claim 1, is characterized in that, described file header adopts symmetry encryption algorithm or unsymmetrical tridiagonal matrix algorithm for encryption.
4. a file decryption method, is characterized in that, encrypts the file obtained and is decrypted, comprising for employing encryption method as claimed any one in claims 1 to 3:
Obtain encrypt file;
Decipher the extended attribute of described encrypt file;
The encryption length value of the file header of described encrypt file is obtained in the extended attribute of described encrypt file;
Calculate the side-play amount of this file header, determine the length value after the encryption of described file header in conjunction with described file header encryption length value;
The file header of enabling decryption of encrypted file, makes encrypt file decipher as source document.
5. a document encrypting apparatus, is characterized in that, comprising:
File obtaining unit, for obtaining file to be encrypted;
File header length determining unit, for judging whether the file header length of described file to be encrypted reaches threshold value, if the length of file header reaches threshold value, does not then carry out entirety encryption to file, and the file header of only encrypt file; If the length of file header does not reach threshold value, then entirety encryption is carried out to file;
Ciphering unit, for when the file header length of described file to be encrypted reaches threshold value, encrypts the file header of this file;
File header length storage unit, for after encryption file to be encrypted is encrypt file, preserves the extended attribute of length value to described encrypt file of described file header;
After in the extended attribute length value of this file header being saved to described encrypt file, encrypt the extended attribute of described file.
6. a file deciphering device, is characterized in that, encrypts the file obtained and is decrypted, comprising for employing encryption method as claimed any one in claims 1 to 3:
File obtaining unit, for obtaining encrypt file;
File header length acquiring unit, for obtaining the encryption length value of the file header of described encrypt file in the extended attribute of described encrypt file;
File header offset computation unit, for calculating the side-play amount of this file header, determines the length value after the encryption of described file header in conjunction with described file header encryption length value;
Decryption unit, for the file header of enabling decryption of encrypted file, makes encrypt file decipher as source document;
Before the encryption length value of file header obtaining described encrypt file, decipher the extended attribute of described encrypt file.
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| CN201010527367.0A CN102456116B (en) | 2010-10-28 | 2010-10-28 | File encryption method, file decryption method and devices |
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| CN201010527367.0A CN102456116B (en) | 2010-10-28 | 2010-10-28 | File encryption method, file decryption method and devices |
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| CN102456116A CN102456116A (en) | 2012-05-16 |
| CN102456116B true CN102456116B (en) | 2015-01-14 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103294961A (en) * | 2013-06-07 | 2013-09-11 | 北京奇虎科技有限公司 | Method and device for file encrypting/decrypting |
| CN105611318A (en) * | 2014-11-25 | 2016-05-25 | 上海天脉聚源文化传媒有限公司 | Method and system for video encryption playing |
| CN105989304A (en) * | 2015-03-06 | 2016-10-05 | 深圳酷派技术有限公司 | File storage method, file reading method, file storage apparatus and file reading apparatus |
| CN104732163B (en) * | 2015-04-03 | 2017-11-03 | 宁波工程学院 | A kind of folder encryption method and encryption file application method |
| CN106372517A (en) * | 2016-08-30 | 2017-02-01 | 北京小米移动软件有限公司 | File encryption method, file decryption method, file encryption device and equipment |
| CN107273766A (en) * | 2017-05-15 | 2017-10-20 | 努比亚技术有限公司 | A kind of method and apparatus of data encryption and decryption |
| CN109714299B (en) * | 2017-10-26 | 2022-01-11 | 创盛视联数码科技（北京）有限公司 | Method for playing encrypted video |
| CN110022558B (en) * | 2019-04-03 | 2023-01-31 | Oppo广东移动通信有限公司 | Method for encrypting and decrypting upgrade package, electronic device and storage medium |
| CN111950016B (en) * | 2019-05-14 | 2023-11-21 | 北京腾云天下科技有限公司 | Method and device for generating data open output model and computing equipment |
| CN112613071A (en) * | 2020-12-25 | 2021-04-06 | 武汉市多比特信息科技有限公司 | File encryption method and device and storage medium |
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| US20050015608A1 (en) * | 2003-07-16 | 2005-01-20 | Pkware, Inc. | Method for strongly encrypting .ZIP files |
| JP2004070049A (en) * | 2002-08-07 | 2004-03-04 | Denso Corp | Encryption method and device for data, decryption method and device for data, and program |
| CN100580684C (en) * | 2008-08-12 | 2010-01-13 | 无敌科技(西安)有限公司 | Method for ciphering and deciphering embedded type multimedia file |
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