CN105763315A - Data encryption and decryption method and apparatus thereof, and communication system - Google Patents
Data encryption and decryption method and apparatus thereof, and communication system Download PDFInfo
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Abstract
A data encryption and decryption method and an apparatus thereof, and a communication system are disclosed. The data encryption method comprises the following steps of segmenting data to be encrypted and generating a segmented data; aiming at the data to be encrypted, randomly selecting an encryption algorithm; randomly generating a secret key corresponding to the encryption algorithm; using the encryption algorithm and the secret key to encrypt the data to be encrypted so as to acquire the encrypted segmented data; packing the encrypted segmented data to acquire an encrypted segmented data block; and combining and packing the encrypted segmented data block to acquire a final cryptograph. By using the encryption method, cracking difficulty is increased and safety of the data encryption method is increased.
Description
Technical field
The present invention relates to a kind of communication system, particularly relate to a kind of method of data encryption and decryption, device and communication system.
Background technology
Data encryption, also known as cryptography, refers to will expressly convert ciphertext to by AES and encryption key, and deciphering is then reverse by decipherment algorithm and decruption key, ciphertext is reduced into original text.Data encryption utilizes cryptographic technique that information is encrypted, it is achieved information hiding, protects information security.
Evolution along with AES, data are carried out block encryption by block encryption algorithm, add data deciphering difficulty, but, take the AES fixed and key to be encrypted, after determining AES and key, expressly form corresponding relation with password, the violence modes such as the method for exhaustion can be adopted to crack, and degree of safety has much room for improvement.
Summary of the invention
The problem that the embodiment of the present invention solves is how to improve the safety of AES.
For solving the problems referred to above, the embodiment of the present invention provides a kind of data ciphering method, and described method includes:
Be-encrypted data is carried out segmentation, produces segment data；
AES is randomly choosed for described be-encrypted data；
The key that stochastic generation is corresponding with described AES；
Be-encrypted data described in described AES and double secret key is utilized to be encrypted, the segment data after being encrypted；
Segment data after described encryption is packed, the segmented data block after being encrypted；
Segmented data block after the combination described encryption of packing, obtains final ciphertext.
Alternatively, described be-encrypted data is carried out segmentation include: be divided into one section to be-encrypted data described in major general.
Alternatively, described AES includes the AES of system default and user-defined AES.
Alternatively, described user-defined AES dynamic extension.
Alternatively, randomly choose AES and include: described AES is numbered, will round the current time in system, divided by the number of described AES, select the AES of gained remainder reference numeral.
Alternatively, the key that stochastic generation is corresponding with described AES includes: be numbered by all key generators corresponding for described AES, store the member function integer array to AES, key generator is randomly choosed according to AES, after initialization key maker, counterpart keys described in stochastic generation.
Alternatively, the AES for encrypting each segment data randomly chooses respectively.
Alternatively, described AES also includes the segmented data block after described encryption is encrypted, and generates the segmented data block after the encryption updated.
Alternatively, described segmented data block after described encryption is encrypted before randomly choose AES, generate the key corresponding with described AES.
Alternatively, described to be undertaken packing by the segment data after described encryption be the length of the segment data adding frame head, the numbering of selected AES, key data district, the length of described segment data and described encryption before segment data after described encryption, adds postamble after the segment data of described encryption.
Alternatively, add described key data district and be added to a few key data section, the corresponding described key data section of described segment data each cipher mode adoptable.
Alternatively, add described key data section to include: add described counterpart keys type, described counterpart keys length and described counterpart keys content.
Alternatively, the segmented data block after the combination described encryption of packing includes: combine the segmented data block after described encryption, adds data head before the segmented data block after described encryption.
Alternatively, the segmented data block after combining described encryption is the segmented data block after at least adding an encryption.
Alternatively, described interpolation data head includes: add frame head；Add the version number of described encryption method；Add the number of the segmented data block after described encryption；Add the length list of the segmented data block after described encryption；Add postamble.
For solving the problems referred to above, the embodiment of the present invention additionally provides a kind of encryption device, including:
Data packet units, carries out segmentation by be-encrypted data, produces segment data；
AES selects unit, randomly chooses AES for described be-encrypted data；
Random key generates unit, the key that stochastic generation is corresponding with described AES；
DEU data encryption unit, utilizes described AES and double secret key that described be-encrypted data is encrypted, the segment data after being encrypted；
Segment data packaged unit, packs the segment data after described encryption, the segmented data block after being encrypted；
Segmented data block packaged unit, the segmented data block after the combination described encryption of packing, obtain final ciphertext.
Accordingly, the embodiment of the present invention also provides for a kind of decryption method, including:
Data to be decrypted are carried out segmentation, produces segmentation ciphertext to be decrypted；
Determine the AES corresponding with described data to be decrypted and the key corresponding with described AES；
Utilize segmentation ciphertext to be decrypted described in the decipherment algorithm and described double secret key that described AES is corresponding to be decrypted, obtain former segment data；
Combine each section of described former segment data, obtain former data.
Optionally it is determined that the method for described AES includes the numbering resolving described AES.
Alternatively, described segmentation ciphertext to be decrypted is decrypted and also includes repeatedly deciphering, namely every time after deciphering to obtaining data frame head, trailer sections detects, if meeting the form of the frame head of segment data ciphertext, postamble, be then again decrypted.
The embodiment of the present invention also provides for a kind of deciphering device, including:
Data to be decrypted are carried out segmentation by data packet units, produce segmented data block to be decrypted；
AES and key determine unit, it is determined that the AES corresponding with described segmented data block to be decrypted and the key corresponding with described AES；
Decryption unit, utilizes segmentation ciphertext to be decrypted described in the decipherment algorithm and described double secret key that described AES is corresponding to be decrypted, obtains former segment data；
Assembled unit, combines described former segment data, obtains former data.
Alternatively, described decryption unit also includes deciphering judging unit, every time after deciphering to obtaining data frame head, trailer sections detects, if meeting the form of the frame head of segment data ciphertext, postamble, be then again decrypted.
The embodiment of the present invention also provides for a kind of communication system, including:
Data encryption end, for be-encrypted data carries out segmentation, produces segment data；AES is randomly choosed for described be-encrypted data；The key that stochastic generation is corresponding with described AES；Be-encrypted data described in described AES and double secret key is utilized to be encrypted, the segment data after being encrypted；Segment data after described encryption is packed, the segmented data block after being encrypted；Segmented data block after the combination described encryption of packing, obtains final ciphertext；
Data deciphering end, for data to be decrypted are carried out segmentation, produces segmented data block to be decrypted；Determine the AES corresponding with described segmented data block to be decrypted and the key corresponding with described AES；Utilize segmentation ciphertext to be decrypted described in the decipherment algorithm and described double secret key that described AES is corresponding to be decrypted, obtain former segment data；Combine each section of described former segment data, obtain former data.
Alternatively, described system is applied to protect the data that the data being suitable to network transmission and local disk preserve.
The embodiment of the present invention also provides for another kind of data ciphering method, including:
For be-encrypted data, randomly choose AES；
Generate the key corresponding with described AES；
Be-encrypted data described in described algorithm to be encrypted and double secret key is used to be encrypted.
The embodiment of the present invention also provides for another kind of encryption device, including:
AES selects unit, for be-encrypted data, randomly chooses AES；
Random key generates unit, generates the random key corresponding with described AES；
Ciphering unit, uses be-encrypted data described in described algorithm to be encrypted and double secret key to be encrypted.
Compared with prior art, the technical scheme of the embodiment of the present invention has the advantage that
By be-encrypted data is carried out segmentation, produce segment data, AES is randomly choosed for be-encrypted data, the key that stochastic generation is corresponding with described AES, the AES for encrypting described be-encrypted data and key is made to have randomness, cracking difficulty thus increasing, improving the safety of described data ciphering method.
Further, AES for encrypting described be-encrypted data includes the AES of system default and user-defined AES, described user-defined AES dynamic extends, the range of choice making described AES expands, increase the randomness of described AES, thus improving the safety of described data ciphering method further.
Further, by randomly choosing the key generator corresponding with described AES, initialization key maker, the mode of stochastic generation key produces the key of described correspondence, the key making described correspondence has randomness, cracking difficulty thus increasing, improving the safety of described data ciphering method.
Further, the AES for encrypting each segment data randomly chooses respectively so that the AES for encrypting every section of segment data is respectively provided with randomness, cracks difficulty thus increasing, and improves the safety of described data ciphering method further.
Further, it is encrypted by the segmented data block after utilizing encryption described in the AES again randomly choosed and double secret key, generate the segmented data block after the encryption updated, make described be-encrypted data by multi-layer security, cracking difficulty thus increasing, improving the safety of described data ciphering method further.
Accompanying drawing explanation
Fig. 1 is the flow chart of a kind of data ciphering method in the embodiment of the present invention；
Fig. 2 is a kind of data encryption device structure chart in the embodiment of the present invention；
Fig. 3 is the flow chart of a kind of data decryption method in the embodiment of the present invention；
Fig. 4 is a kind of data decryption apparatus structure chart in the embodiment of the present invention；
Fig. 5 is a kind of communication system schematic diagram in the embodiment of the present invention；
Fig. 6 is the flow chart of another kind of data ciphering method in the embodiment of the present invention；
Fig. 7 is another kind of data encryption device structure chart in the embodiment of the present invention.
Detailed description of the invention
As it was previously stated, take the AES fixed and key to be encrypted, after determining AES and key, expressly form corresponding relation with password, it is possible to adopting the violence modes such as the method for exhaustion to crack, degree of safety has much room for improvement.
For this problem, the embodiment of the present invention is by carrying out segmentation by be-encrypted data, produce segment data, AES is randomly choosed for be-encrypted data, the key that stochastic generation is corresponding with described AES, make the AES for encrypting described be-encrypted data and key have randomness, cracking difficulty thus increasing, improving the safety of described data ciphering method.
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
With reference to the flow chart of the data ciphering method shown in Fig. 1, it is described in detail below by way of concrete steps.
S11, carries out segmentation by be-encrypted data, produces segment data.
In being embodied as, it is possible to be-encrypted data is divided into multistage, it is also possible to using be-encrypted data as one section.
S12, randomly chooses AES for described be-encrypted data.
In being embodied as, AES for encrypting described be-encrypted data can include the AES of system default and user-defined AES, described user-defined AES dynamic extends, the range of choice making described AES expands, increase the randomness of described AES, thus improving the safety of described data ciphering method further.
In the present invention one specific embodiment, user-defined AES, use xml to carry out configuration and read, this xml deposits under etc/ catalogue, resolve xml and obtain the node of Custom Encryption algorithm, after class instantiation being obtained algorithm instance by reflection, join in AES container.If follow-up user to extend AES, only need to writing AES, and increase algorithm node configuration item in this ect/encryto.xml, system just can read all AESs.
In another specific embodiment of the present invention, user, by being numbered by AES, will round the current time in system, divided by the mode of the number of AES, selects the AES of gained remainder reference numeral, thus ensureing the randomness of selected AES.
S13, the key that stochastic generation is corresponding with described AES.
In being embodied as, user can by can key generator be numbered, it is stored in the member function integer array of the AES randomly choosed, the key generator of energy is randomly choosed according to AES, after initialization key maker, the key that stochastic generation is corresponding with the AES randomly choosed.Owing to selected key has randomness so that cracking difficulty increases, thus improving the safety of data ciphering method further.
S14, utilizes be-encrypted data described in described AES and double secret key to be encrypted, the segment data after being encrypted.
In being embodied as, when every section of segment data is encrypted, AES can be randomly choosed respectively, the key generator of energy is randomly choosed respectively according to selected AES, Initialize chosen key generator, obtain random key, utilize the AES randomly choosed and key respectively every section of segment data to be encrypted.AES and key owing to using when every section of segment data is encrypted all randomly choose so that the difficulty cracked increases, thus the safety of data ciphering method can be further enhanced.
In being embodied as, it is also possible to using the segmented data block after encryption as be-encrypted data, being again encrypted, generate the segmented data block after the encryption updated, the number of times that the segmented data block after encryption is encrypted can be determined according to actual needs by user.
In the present invention one specific embodiment, every time when the segmented data block after encryption is encrypted, the encryption method all randomly choosed, the key generator of energy is randomly choosed respectively according to selected AES, Initialize chosen key generator, obtain random key, utilize the segment data after the AES randomly choosed and key pair encryption to be encrypted.Owing to be-encrypted data by multi-layer security, and can be used for the encryption method encrypted and key is respectively provided with randomness every time so that crack difficulty and be greatly increased, thus improve the safety of encryption method.
S15, packs the segment data after described encryption, the segmented data block after being encrypted.
In being embodied as, can by adding the length of the segment data of frame head, the numbering of selected AES, key data district, the length of described segment data and described encryption before segment data after encryption, the mode adding postamble after the segment data of described encryption is packed, the segmented data block after being encrypted.
In being embodied as, add key data district and can pass through to add the realization of at least one key data section, all corresponding key data section of each cipher mode that segment data can adopt.
In the present invention one specific embodiment, add key data section and realize by adding the Key Tpe corresponding with the encryption method of encryption segment data use, corresponding key length and corresponding cipher key content.
S16, the segmented data block after the combination described encryption of packing, obtain final ciphertext.
In being embodied as, it is possible to by adding the segmented data block after at least one encryption, add the mode of data head before segmented data block after encryption and be combined packing.
In the present invention one specific embodiment, by adding frame head, add the version number of described encryption method, add the number of the segmented data block after described encryption, add the length list of the segmented data block after described encryption, add the mode of postamble, the interpolation of complete paired data head.
For making those skilled in the art be more fully understood that and realizing this encryption method, referring to accompanying drawing, by specific embodiment, the encryption device that can realize above-mentioned encryption method is described in detail.
With reference to encryption device structural representation in the one embodiment of the invention shown in Fig. 2, encryption device includes: data packet units 21, AES select unit 22, random key to generate unit 23, DEU data encryption unit 24, segment data packaged unit 25 and segmented data block packaged unit 26.Wherein:
Data packet units 21, carries out segmentation by be-encrypted data, produces segment data；
AES selects unit 22, randomly chooses AES for described be-encrypted data；
Random key generates unit 23, the key that stochastic generation is corresponding with described AES；
DEU data encryption unit 24, utilizes described AES and double secret key that described be-encrypted data is encrypted, the segment data after being encrypted；
Segment data packaged unit 25, packs the segment data after described encryption, the segmented data block after being encrypted；
Segmented data block packaged unit 26, the segmented data block after the combination described encryption of packing, obtain final ciphertext.
Except the embodiment of data ciphering method, the embodiment of the present invention also provides for corresponding data decryption method, with reference to the flow chart of the data ciphering method shown in Fig. 3, is described in detail below by way of concrete steps.
Data to be decrypted are carried out segmentation by S31, produce segmented data block to be decrypted.
S32, it is determined that the AES corresponding with described data to be decrypted and the key corresponding with described AES.
In the present invention one specific embodiment, when user is by resolving segment data to be decrypted encryption, the numbering of AES used determines described AES.
S33, utilizes segmentation ciphertext to be decrypted described in the decipherment algorithm and described double secret key that described AES is corresponding to be decrypted, obtains former segment data.
In being embodied as, described segmentation ciphertext to be decrypted is decrypted and includes repeatedly deciphering, namely every time after deciphering to obtaining data frame head, trailer sections detects, if meeting the form of the frame head of segment data ciphertext, postamble, then again it is decrypted, until obtaining former segment data.
S34, combines each section of described former segment data, obtains former data.
For making those skilled in the art be more fully understood that and realizing this decryption method, referring to accompanying drawing 4, by specific embodiment, the deciphering device that can realize above-mentioned decryption method is described in detail.
With reference to deciphering close apparatus structure schematic diagram in the one embodiment of the invention shown in Fig. 4, deciphering device includes:
Data to be decrypted are carried out segmentation by data packet units 41, produce segmentation ciphertext to be decrypted；
AES and key determine unit 42, it is determined that the AES corresponding with described data to be decrypted and the key corresponding with described AES；
Decryption unit 43, utilizes segmentation ciphertext to be decrypted described in the decipherment algorithm and described double secret key that described AES is corresponding to be decrypted, obtains former segment data；
Assembled unit 44, combines described former segment data, obtains former data.
In being embodied as, decryption unit 43 may also include deciphering judging unit, every time after deciphering to obtaining data frame head, trailer sections detects, if meeting the form of the frame head of segment data ciphertext, postamble, be then again decrypted.
The embodiment of the present invention also provides for a kind of communication system, with reference to the specific embodiment shown in accompanying drawing 5, it is possible to achieve the communication system of said method includes data encryption end 51 and data decrypting end 52:
Data encryption end 51, for be-encrypted data carries out segmentation, produces segment data；AES is randomly choosed for described be-encrypted data；The key that stochastic generation is corresponding with described AES；Be-encrypted data described in described AES and double secret key is utilized to be encrypted, the segment data after being encrypted；Segment data after described encryption is packed, the segmented data block after being encrypted；Segmented data block after the combination described encryption of packing, obtains final ciphertext.
Data deciphering end 52, for data to be decrypted are carried out segmentation, produces segmentation ciphertext to be decrypted；Determine the AES corresponding with described data to be decrypted and the key corresponding with described AES；Utilize segmentation ciphertext to be decrypted described in the decipherment algorithm and described double secret key that described AES is corresponding to be decrypted, obtain former segment data；Combine each section of described former segment data, obtain former data.
In being embodied as, described system is applied to the data protecting the data being suitable to network transmission and local disk to preserve.
The embodiment of the present invention also provides for another kind of encryption method, as shown in Figure 6, comprises the steps:
S61, for be-encrypted data, randomly chooses AES；
S62, generates the key corresponding with described AES；
S63, uses be-encrypted data described in described algorithm to be encrypted and double secret key to be encrypted.
For making those skilled in the art be more fully understood that and realizing described another kind of encryption method, referring to accompanying drawing 7, by specific embodiment, the encryption device that can realize above-mentioned encryption method is described in detail.
With reference to encryption device structural representation in the one embodiment of the invention shown in Fig. 7, deciphering device includes:
AES selects unit 71, for be-encrypted data, randomly chooses AES；
Random key generates unit 72, generates the random key corresponding with described AES；
Ciphering unit 73, uses be-encrypted data described in described algorithm to be encrypted and double secret key to be encrypted.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment can be by the hardware that program carrys out instruction relevant and completes, this program can be stored in a computer-readable recording medium, and storage medium may include that ROM, RAM, disk or CD etc..
Although present disclosure is as above, but the present invention is not limited to this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (25)
1. a data ciphering method, it is characterised in that including:
Be-encrypted data is carried out segmentation, produces segment data；
AES is randomly choosed for described be-encrypted data；
The key that stochastic generation is corresponding with described AES；
Be-encrypted data described in described AES and double secret key is utilized to be encrypted, the segment data after being encrypted；
Segment data after described encryption is packed, the segmented data block after being encrypted；
Segmented data block after the combination described encryption of packing, obtains final ciphertext.
2. data ciphering method according to claim 1, it is characterised in that described be-encrypted data is carried out segmentation include: be divided into a section to be-encrypted data described in major general.
3. data ciphering method according to claim 1, it is characterised in that described AES includes the AES of system default and user-defined AES.
4. data ciphering method according to claim 3, it is characterised in that described user-defined AES dynamic extends.
5. data ciphering method according to claim 1, it is characterized in that, described in randomly choose AES and include: described AES is numbered, will round the current time in system, divided by the number of described AES, select the AES of gained remainder reference numeral.
6. data ciphering method according to claim 1, it is characterized in that, the key that stochastic generation is corresponding with described AES includes: be numbered by all key generators corresponding for described AES, store the member function integer array to described AES, key generator is randomly choosed according to AES, after initialization key maker, key corresponding described in stochastic generation.
7. data ciphering method according to claim 1, it is characterised in that the AES for encrypting each segment data randomly chooses respectively.
8. data ciphering method according to claim 1, it is characterised in that also include: the segmented data block after described encryption is encrypted, generates the segmented data block after the encryption updated.
9. data ciphering method according to claim 8, it is characterised in that described segmented data block after described encryption is encrypted before, also include: randomly choose AES, generate the key corresponding with the AES randomly choosed.
10. data ciphering method according to claim 1, it is characterized in that, described segment data after described encryption is carried out packing include: add the length of the segment data of frame head, the numbering of selected AES, key data district, the length of described segment data and described encryption before the segment data after described encryption, after the segment data of described encryption, add postamble.
11. data ciphering method according to claim 10, it is characterised in that add described key data district and be added to a few key data section, the corresponding described key data section of described segment data each cipher mode adoptable.
12. data ciphering method according to claim 11, it is characterised in that described interpolation described key data section includes: add the cipher key content of described counterpart keys type, described counterpart keys length and described correspondence.
13. data ciphering method according to claim 1, it is characterised in that the segmented data block after the described combination described encryption of packing includes:
Combine the segmented data block after described encryption；
Data head is added before segmented data block after described encryption.
14. data ciphering method according to claim 13, it is characterised in that the segmented data block after the described encryption of described combination is the segmented data block after at least adding an encryption.
15. data ciphering method according to claim 13, it is characterised in that described interpolation data head includes:
Add frame head；Add the version number of described encryption method；Add the number of the segmented data block after described encryption；Add the length list of the segmented data block after described encryption；Add postamble.
16. a data encryption device, it is characterised in that including:
Data packet units, carries out segmentation by be-encrypted data, produces segment data；
AES selects unit, randomly chooses AES for described be-encrypted data；
Random key generates unit, the key that stochastic generation is corresponding with described AES；
DEU data encryption unit, utilizes described AES and double secret key that described be-encrypted data is encrypted, the segment data after being encrypted；
Segment data packaged unit, packs the segment data after described encryption, the segmented data block after being encrypted；
Segmented data block packaged unit, the segmented data block after the combination described encryption of packing, obtain final ciphertext.
17. a decryption method, it is characterised in that including:
Data to be decrypted are carried out segmentation, produces segmented data block to be decrypted；
Determine the AES corresponding with described segmented data block to be decrypted and the key corresponding with described AES；
Utilize segmented data block to be decrypted described in the decipherment algorithm and described double secret key that described AES is corresponding to be decrypted, obtain former segment data；
Combine each section of described former segment data, obtain former data.
18. according to the decryption method that claim 17 is stated, it is characterised in that determine that the method for described AES includes: resolve the numbering of described AES.
19. according to the decryption method that claim 17 is stated, it is characterized in that, described described segmented data block to be decrypted is decrypted includes: repeatedly decipher, every time after deciphering to obtaining data frame head, trailer sections detects, if meeting the form of the frame head of segment data ciphertext, postamble, then again it is decrypted.
20. a deciphering device, it is characterised in that including:
Data to be decrypted are carried out segmentation by data packet units, produce segmented data block to be decrypted；
AES and key determine unit, it is determined that the AES corresponding with described data to be decrypted and the key corresponding with described AES；
Decryption unit, utilizes segmented data block to be decrypted described in the decipherment algorithm and described double secret key that described AES is corresponding to be decrypted, obtains former segment data；
Assembled unit, combines described former segment data, obtains former data.
21. deciphering device according to claim 20, it is characterized in that, described decryption unit also includes deciphering judging unit, described deciphering judging unit be suitable to every time deciphering after to obtaining data frame head, trailer sections detects, if meeting the form of the frame head of segment data ciphertext, postamble, then again it is decrypted.
22. a communication system, it is characterised in that including:
Data encryption end, for be-encrypted data carries out segmentation, produces segment data；AES is randomly choosed for described be-encrypted data；The key that stochastic generation is corresponding with described AES；Be-encrypted data described in described AES and double secret key is utilized to be encrypted, the segment data after being encrypted；
Segment data after described encryption is packed, the segmented data block after being encrypted；Segmented data block after the combination described encryption of packing, obtains final ciphertext；
Data deciphering end, for data to be decrypted are carried out segmentation, produces segmented data block to be decrypted；Determine the AES corresponding with described data block to be decrypted and the key corresponding with described AES respectively；Utilize segmentation ciphertext to be decrypted described in the decipherment algorithm and described double secret key that described AES is corresponding to be decrypted, obtain former segment data；Combine each section of described former segment data, obtain former data.
23. according to the communication system described in right 22, it is characterised in that described system is applied to the data protecting the data being suitable to network transmission and local disk to preserve.
24. a data ciphering method, it is characterised in that including:
For be-encrypted data, randomly choose AES；
Generate the key corresponding with described AES；
Be-encrypted data described in described algorithm to be encrypted and double secret key is used to be encrypted.
25. a data encryption device, it is characterised in that including:
AES selects unit, for be-encrypted data, randomly chooses AES；
Random key generates unit, generates the random key corresponding with described AES；
Ciphering unit, uses be-encrypted data described in described algorithm to be encrypted and double secret key to be encrypted.
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