CN101621376A - Method, device and system for multi-level encryption and decryption - Google Patents
Method, device and system for multi-level encryption and decryption Download PDFInfo
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Abstract
The invention provides a method, a device and a system for multi-level encryption and decryption. The method comprises the following steps of: dividing a received protocol data unit into data blocks with equal lengths; primarily encrypting a audio basic code stream and/or a video basic code stream in the divided data blocks; converting the encrypted audio basic code stream and/or video basic code stream into a transmission code stream; and secondarily encrypting the transmission code stream obtained by conversion. Due to the adoption of the multi-level encryption, the data transmission is safer; and by dividing the protocol data unit into the data blocks with equal lengths, lower time delay and stronger fault tolerant ability are achieved in the data transmission, and high transmission band width is provided at the same time.
Description
Technical field
The present invention relates to the encryption and decryption technique field, particularly multi-level encryption decryption method, Apparatus and system.
Technical background
In the IP network environment, following requirement is arranged usually for cryptographic algorithm:
(1) fail safe
Fail safe is the core requirement of encryption method.Encipherment scheme should be able to provide enough protections to content on the one hand; On the other hand, consider the application of commercial presence, the one-tenth that its fail safe consumed should be controlled in the reasonable range.With respect to traditional data, the data volume of audio/video information is big, exists bigger redundancy between data, and its requirement to fail safe is higher.
(2) complexity
Streaming Media application requirements mobile terminal device is decryption content in real time, and computing ability in mobile terminal device ground is limited ground, and therefore, the complexity of decryption of video all can not be too high.
(3) fault-tolerance
Have a large amount of errors of transmission in the IP network, congested, buffering area overflows and the diverse network mistake all may cause packet loss, and various unexpected errors also can cause transmitting byte error.
Prior art adopts displacement to encrypt, with deblocking, and upset in proper order, only recover upsetting data according to the mode of communicating pair agreement, just can obtain correct plaintext, method of replacing generally can not change the statistical property of video or image, is not suitable for the application higher to security level required of high secret.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of multi-level encryption decryption method and device, reached the transfer of data low delay, the effect of high fault-tolerant ability.
In order to achieve the above object, the invention provides a kind of multi-level encryption method, this method may further comprise the steps:
Cutting apart the protocol Data Unit that receives is data blocks in equal, audio elementary code stream in the divided data piece and/or video elementary code stream are carried out the one-level encryption, audio elementary code stream and/or video elementary code stream after encrypting are converted to transmission code stream, the transmission code stream that is converted to are carried out secondary encrypt.
As one embodiment of the present of invention, data blocks in equal length is 1288 bytes.
As one embodiment of the present of invention, described one-level is encrypted the different keys of encrypting according to the different time sections acquisition with secondary and is carried out.
As one embodiment of the present of invention, the data block before and after encrypting adopts different effective signs to represent.
The invention provides a kind of multistage decryption method, this method may further comprise the steps:
Cutting apart the protocol Data Unit that receives is data blocks in equal, transmission code stream in the divided data piece is carried out a level decryption, transmission code stream after the deciphering is converted to audio elementary code stream and/or video elementary code stream, audio elementary code stream and/or the video elementary code stream that is converted to carried out two level decryptions.
As one embodiment of the present of invention, data blocks in equal length is 1288 bytes.
As one embodiment of the present of invention, a described level decryption carries out according to the different keys that different time sections obtains with two level decryptions.
As one embodiment of the present of invention, the data block before and after the deciphering adopts different effective signs to represent.
The invention provides a kind of multi-level encryption device, this device comprises:
Data block is cut apart module, and being used to cut apart the protocol Data Unit that receives is data blocks in equal;
The one-level encrypting module is used for the audio elementary code stream and/or the video elementary code stream of divided data piece are carried out the one-level encryption;
The code stream modular converter is used for audio elementary code stream and/or video elementary code stream after encrypting are converted to transmission code stream;
The secondary encrypting module is used for that the transmission code stream that is converted to is carried out secondary and encrypts.
As one embodiment of the present of invention, data block is cut apart module data block is divided into 1288 bytes.
As one embodiment of the present of invention, the one-level encrypting module is encrypted according to the different keys that different time sections obtains with the secondary encrypting module.
The invention provides a kind of multistage decryption device, this device comprises:
Data block is cut apart module, and being used to cut apart the protocol Data Unit that receives is data blocks in equal;
The one-level deciphering module is used for the transmission code stream of divided data piece is carried out a level decryption;
The code stream modular converter is used for the transmission code stream after the deciphering is converted to audio elementary code stream and/or video elementary code stream;
The secondary deciphering module is used for the audio elementary code stream and/or the video elementary code stream that are converted to are carried out two level decryptions.
As one embodiment of the present of invention, data block is cut apart module data block is divided into 1288 bytes.
As one embodiment of the present of invention, the one-level deciphering module is decrypted according to the different keys that different time sections obtains with the secondary deciphering module.
The invention provides a kind of multi-level encryption decryption system, this system comprises with lower device:
The multi-level encryption device, being used to cut apart the protocol Data Unit that receives is data blocks in equal, audio elementary code stream in the divided data piece and/or video elementary code stream are carried out the one-level encryption, audio elementary code stream and/or video elementary code stream after encrypting are converted to transmission code stream, the transmission code stream that is converted to are carried out secondary encrypt;
Multistage decryption device, being used to cut apart the protocol Data Unit that receives is data blocks in equal, transmission code stream in the divided data piece is carried out a level decryption, transmission code stream after the deciphering is converted to audio elementary code stream and/or video elementary code stream, audio elementary code stream and/or the video elementary code stream that is converted to carried out two level decryptions;
Key generation apparatus is used to produce multi-level encryption device and the required key of multistage decryption device.
The present invention is a data blocks in equal by cutting apart the protocol Data Unit that receives, and the audio elementary code stream in the divided data piece and/or video elementary code stream are carried out one-level encrypt, audio elementary code stream and/or video elementary code stream after encrypting are converted to transmission code stream, the transmission code stream that is converted to are carried out secondary encrypt.Adopt multi-level encryption to make transfer of data safer, and, have lower time-delay and stronger fault-tolerant ability when making transfer of data, high transmission bandwidth is provided simultaneously by protocol Data Unit is divided into data blocks in equal.
Description of drawings
Fig. 1 is the flow chart of one embodiment of the invention multi-level encryption method;
Fig. 2 is the flow chart of a preferred embodiment of the invention multi-level encryption method;
Fig. 3 is the flow chart of the multistage decryption method of one embodiment of the invention;
Fig. 4 is the flow chart of the multistage decipherment algorithm of a preferred embodiment of the invention;
Fig. 5 is the structure chart of one embodiment of the invention multi-level encryption device;
Fig. 6 is the structure chart of a preferred embodiment of the invention multi-level encryption device;
Fig. 7 is the structure chart of the multistage decryption device of one embodiment of the invention;
Fig. 8 is the structure chart of the multistage decryption device of a preferred embodiment of the invention;
Fig. 9 is the structure chart of one embodiment of the invention multi-level encryption decryption system;
Figure 10 is the structure chart of a preferred embodiment of the invention multi-level encryption decryption system.
Embodiment
For making purpose of the present invention clearer, reach specific embodiment now in conjunction with the accompanying drawings and be described.Below by the embodiment that is described with reference to the drawings is exemplary, only is used to explain the present invention, and can not be interpreted as limitation of the present invention.
Fig. 1 is the flow chart of one embodiment of the invention multi-level encryption method;
As shown in Figure 1, the multi-level encryption method realizes by following steps:
S101, cutting apart the protocol Data Unit that receives is data blocks in equal;
Wherein, data blocks in equal length is 1288 bytes, certainly, can further cut apart according to length 1288 bytes of available data piece, therefore, contains based on all should be protection range of the present invention with the variation that does not break away from inventive concept.
S102 carries out the one-level encryption to audio elementary code stream in the divided data piece and/or video elementary code stream;
Different keys according to the different time sections acquisition, audio elementary code stream and/or video elementary code stream are carried out the one-level encryption, wherein can only contain the audio elementary code stream in the divided data piece, also can only contain the video elementary code stream, perhaps contain audio elementary code stream and video elementary code stream, this need determine according to the actual needs of transmission.
S103 is converted to transmission code stream with audio elementary code stream and/or video elementary code stream after encrypting;
Audio elementary code stream after encrypting and/or video elementary bit stream data piece are provided with criterion knowledge expression, with difference unencrypted data block and secondary data encrypted piece.
S104 carries out secondary to the transmission code stream that is converted to and encrypts.
The different keys that obtain according to different time sections carry out the secondary encryption to transmission code stream, and the transmission code stream data block after encrypting is provided with criterion knowledge expression, with difference one-level encrypted data chunk and clear data piece.
One-level is encrypted and secondary is encrypted also to use same key to encrypt.Contain based on all should be protection range of the present invention with the variation that does not break away from inventive concept.
Fig. 2 is the flow chart of a preferred embodiment of the invention multi-level encryption method;
As shown in Figure 2, the multi-level encryption method realizes by following steps:
S201 carries out the digitlization conversion with analog audio data and/or the video data that obtains;
Obtain the voice data and/or the video data of simulation by camera and other audio and video acquisition devices, both can obtain voice data separately and also can obtain video data separately, perhaps audio, video data obtains simultaneously, analog audio data and/or the video data that obtains carried out the digitlization conversion, promptly analogue data is sampled.
S202 changes the audio elementary code stream and/or the video elementary code stream that form to the process digitlization of compression and carries out the one-level encryption respectively;
S201 is compressed through audio elementary code stream and/or the video elementary code stream that the digitlization conversion forms, the audio elementary code stream after the compression is replaced encryption according to the cipher key change time, can utilize prior art to produce key.Supposing has two keys, and key A and key B adopt key A that the audio elementary code stream after compressing is encrypted earlier, wherein the key rotation time, such as being 15 minutes, adopts key B that the in good time audio elementary code stream after compressing is encrypted after promptly 15 minutes.In like manner, suppose ciphering key and key D, can replace encryption according to the cipher key change time to the video elementary code stream after the compression equally, cycle alternation is encrypted code stream like this.
S203 will be converted to transmission code stream through audio elementary code stream and/or the video elementary code stream that one-level is encrypted;
To send in the net load processor through audio elementary code stream and/or video elementary code stream after the one-level encryption among the S202, and then conversion forms transmission code stream.
S204 carries out secondary to described transmission code stream and encrypts.
The transmission code stream that conversion among the S203 is formed replaces encryption according to the cipher key change time, suppose two keys are arranged, key E and key F, and, the cipher key change time is 15 minutes, at first adopts key E that transmission code stream is encrypted, after 15 minutes, adopt key F that in good time transmission code stream is encrypted, follow-up cycle alternation is encrypted code stream.
Do not limit in above-mentioned ciphering process by two keys and undertaken, two keys are exemplary explanation, contain based on all should be protection range of the present invention with the variation that does not break away from inventive concept.
Certainly, one-level encryption and secondary are encrypted and also can be utilized same key to carry out twice encryption respectively.
Before above-mentioned one-level encryption and secondary encryption, the code stream that audio elementary code stream before respectively one-level being encrypted and video elementary code stream are divided into predetermined length 1288 byte-sized, and secondary is encrypted the code stream that preceding transmission code stream is divided into predetermined length 1288 byte-sized, and code stream can transmit and decipher effectively like this.
Above-mentioned all ciphering process all are to finish in application layer, and application layer protocol data cell PDU is provided with different effective signs before and after encrypting, and whether through encrypting, make things convenient for the receiving terminal deciphering in order to expression PDU unit simultaneously.
The detailed process that one-level is encrypted and secondary is encrypted can be carried out according to existing symmetric encryption method and asymmet-ric encryption method, and wherein, symmetric encipherment algorithm can carry out according to DES, IDEA, AES scheduling algorithm; Rivest, shamir, adelman can carry out according to RSA, DSA etc.Contain based on all should be protection range of the present invention with the variation that does not break away from inventive concept.
Fig. 3 is the flow chart of the multistage decryption method of one embodiment of the invention;
As shown in Figure 3, multistage decryption method may further comprise the steps:
S301, cutting apart the protocol Data Unit that receives is data blocks in equal;
Wherein, data blocks in equal length is 1288 bytes, certainly, can further cut apart according to length 1288 bytes of available data piece, therefore, contains based on all should be protection range of the present invention with the variation that does not break away from inventive concept.
S302, the transmission code stream in the divided data piece carries out a level decryption;
According to the different keys that different time sections obtains, perhaps the same key that one-level is encrypted and the secondary encryption is used is carried out a level decryption to transmission code stream in the divided data piece,
S303 is converted to audio elementary code stream and/or video elementary code stream with the transmission code stream after the deciphering;
Transmission code stream behind one level decryption is provided with criterion knows expression, with the difference not transmission code stream of deciphering and the data block behind two level decryptions.
S304, the audio elementary code stream and/or the video elementary code stream that are converted to carry out two level decryptions.
Different keys according to the different time sections acquisition, perhaps the same key that one-level is encrypted and the secondary encryption is used is carried out two level decryptions to audio elementary code stream and/or the video elementary code stream that is converted to, the code stream that wherein is converted to both can be that the audio elementary code stream also can be the video elementary code stream, or audio elementary code stream and video elementary code stream.Determine according to actual needs.And the data block after the deciphering is provided with criterion knows expression.
Fig. 4 is the flow chart of the multistage decipherment algorithm of a preferred embodiment of the invention;
Show that as Fig. 4 multistage decryption method realizes by following steps:
S401 receives to contain and encrypts the effectively transmission code stream of sign of back;
S402 carries out a level decryption to the transmission code stream after the encryption that receives.
According to the decruption key that obtains the transmission code stream after encrypting is decrypted, transmission code stream after the close secondary of one level decryption homographic solution is encrypted, carry out if ciphering process is the different keys by different time sections, then decrypting process also will carry out according to the different keys of different time sections.Such as, relate to two key E, F if secondary is encrypted, and at first encrypt by key E, after a period of time,, encrypt by key F again such as 15 minutes; That will be decrypted by key E earlier in the process of deciphering, after a period of time, such as 15 minutes, utilize key F to be decrypted again.
S403 is converted to audio elementary code stream and/or video elementary code stream after the encryption with the transmission code stream after the deciphering;
S404 carries out two level decryptions to audio elementary code stream and/or the video elementary code stream that is converted to
Reception contains encrypts the effectively transmission code stream of sign of back, if ciphering process is to encrypt according to the different keys of different time sections, then decrypting process will be according to the alternately time of key, at first adopt different keys to replace two level decryptions to the transmission code stream of encrypting through secondary that receives, transmission code stream after will deciphering then is converted to audio elementary code stream and/or video elementary code stream, and then carry out a level decryption, to obtain audio elementary code stream and/or video elementary code stream.
The transmission code stream of receiving terminal after to the encryption that receives is decrypted, utilize two key E and F, and the key rotation time is 15 minutes, transmission code stream after encrypting through secondary is replaced deciphering, at first utilize key E deciphering, after 15 minutes, in good time transmission code stream is utilized the F deciphering, cycle alternation carries out two level decryptions, and audio elementary code stream and/or the video elementary code stream that is converted to behind two level decryptions carried out a level decryption.In like manner, the audio elementary code stream utilizes alternately deciphering of key A and B, and the video elementary code stream utilizes alternately deciphering of ciphering key and D.
One-level encrypt and the secondary encryption in, if according to the different secret key encryptions of different time sections, two keys that wherein relate to are exemplary explanation, corresponding decrypting process still is exemplary description.Contain based on all should be protection range of the present invention with the variation that does not break away from inventive concept.
If one-level is encrypted and the secondary encryption is to utilize a key to carry out multipole encryption, a level decryption also carries out multipole deciphering according to identical key with two level decryptions so.
Fig. 5 is the structure chart of one embodiment of the invention multi-level encryption device;
As shown in Figure 5, this multi-level encryption device 500 comprises:
Data block is cut apart module 510, and being used to cut apart the protocol Data Unit that receives is data blocks in equal;
One-level encrypting module 520 is used for the audio elementary code stream and/or the video elementary code stream of divided data piece are carried out the one-level encryption;
Code stream modular converter 530 is used for audio elementary code stream and/or video elementary code stream after encrypting are converted to transmission code stream;
Wherein, data block is cut apart module 510 data block is divided into 1288 bytes.One-level encrypting module 520 is encrypted according to the different keys that different time sections obtains with secondary encrypting module 540.One-level encrypting module 520 also can be encrypted according to identical key with secondary encrypting module 540.
Fig. 6 is the structure chart of a preferred embodiment of the invention multi-level encryption device;
As shown in Figure 6, multi-level encryption device 600 comprises digitlization modular converter 610, one-level encrypting module 620, code stream modular converter 630, secondary encrypting module 640.
Wherein, digitlization modular converter 610, the analog audio data and/or the video data that are used for obtaining carry out the digitlization conversion; One-level encrypting module 620 is used for the audio elementary code stream and/or the video elementary code stream that form through the digitlization conversion of compression are carried out the one-level encryption respectively; Code stream modular converter 630, the audio elementary code stream and/or the video elementary code stream that are used for encrypting through one-level are converted to transmission code stream; Secondary encrypting module 640 is used for that the transmission code stream that the code stream modular converter forms is carried out secondary and encrypts.
As shown in Figure 6, multi-level encryption device 600 comprises that further code stream is cut apart module 650 and encryption identification is provided with module 660.
Wherein, code stream is cut apart module 650, is used for the code stream that audio elementary code stream that the one-level encryption is preceding and/or video elementary code stream are divided into predetermined length 1288 byte-sized; With, be used for secondary is encrypted the code stream that preceding transmission code stream is divided into predetermined length 1288 byte-sized; Encryption identification is provided with module 660, is used for application layer protocol data cell PDU different effective signs is set before and after encrypting.
Fig. 7 is the structure chart of the multistage decryption device of one embodiment of the invention;
As shown in Figure 7, multistage decryption device 700, this device comprises:
Data block is cut apart module 710, and being used to cut apart the protocol Data Unit that receives is data blocks in equal; One-level deciphering module 720 is used for the transmission code stream of divided data piece is carried out a level decryption; Code stream modular converter 730 is used for the transmission code stream after the deciphering is converted to audio elementary code stream and/or video elementary code stream; Secondary deciphering module 740 is used for the audio elementary code stream and/or the video elementary code stream that are converted to are carried out two level decryptions.
Wherein, data block is cut apart module 710 data block is divided into 1288 bytes.One-level deciphering module 720 is decrypted according to the different keys that different time sections obtains with secondary deciphering module 740.Certainly, one-level deciphering module 720 and secondary deciphering module 740 also can be decrypted according to same key.Contain based on all should be protection range of the present invention with the variation that does not break away from inventive concept.
Fig. 8 is the structure chart of the multistage decryption device of a preferred embodiment of the invention;
As shown in Figure 8, multistage decryption device 800 comprises code stream receiver module 810, one-level deciphering module 820, and code stream modular converter 830 and secondary deciphering module 840, wherein:
Code stream receiver module 810 is used to receive contain and encrypts the effectively transmission code stream of sign of back;
One-level deciphering module 820 is used for the transmission code stream after the encryption that receives is carried out a level decryption;
Code stream modular converter 830 is converted to audio elementary code stream and/or video elementary code stream after the encryption with the transmission code stream after the deciphering;
Wherein, the deciphering sign is provided with module, is used for that the code stream after the deciphering is provided with the decryption protocol data cell and effectively identifies.
Fig. 9 is the structure chart of one embodiment of the invention multi-level encryption decryption system;
As shown in Figure 9, multi-level encryption decryption system 900, this system comprises with lower device:
Multi-level encryption device 910, being used to cut apart the protocol Data Unit that receives is data blocks in equal, audio elementary code stream in the divided data piece and/or video elementary code stream are carried out the one-level encryption, audio elementary code stream and/or video elementary code stream after encrypting are converted to transmission code stream, the transmission code stream that is converted to are carried out secondary encrypt;
Key generation apparatus 920 is used to produce multi-level encryption device and the required key of multistage decryption device;
Multistage decryption device 930, being used to cut apart the protocol Data Unit that receives is data blocks in equal, transmission code stream in the divided data piece is carried out a level decryption, transmission code stream after the deciphering is converted to audio elementary code stream and/or video elementary code stream, audio elementary code stream and/or the video elementary code stream that is converted to carried out two level decryptions.
Figure 10 is the structure chart of a preferred embodiment of the invention multi-level encryption decryption system.
As shown in figure 10, encryption and decryption transmission system 1000, this system comprises:
Audio and video acquisition devices 1010 is used to gather the audio frequency and video image;
Obtain the voice data and/or the video data of simulation by camera and other audio and video acquisition devices, both can obtain voice data separately and also can obtain video data separately, perhaps audio, video data obtains simultaneously, analog audio data and/or the video data that obtains carried out the digitlization conversion, promptly analogue data is sampled.Data compression coding to gathering simultaneously.
Key produces management devices 1020, is used for producing and distributing key;
Produce key seed, to multi-level encryption device 1030, video server 1040 and multistage decryption device 1050 distributing key.Key produces management devices 1020 and distributes different keys in the different time periods.Can certainly distribute identical key to them.
Multi-level encryption device 1030 is used to receive key and produces the key that management devices 1020 distributes, and the audio frequency and video image that audio and video acquisition devices 1010 is gathered carries out multi-level encryption, and the dark text after will encrypting sends to video server 1040;
Video server 1040 is used to receive the dark text that multi-level encryption device 1030 sends, and dark text is sent to multistage decryption device 1050, simultaneously the current dark text of real time decrypting;
Video server 1040 obtains the different keys that key produces the different time sections of management devices 1020 distribution, the dark text that receives is carried out multistage deciphering obtain expressly, and will expressly send to the storage device of video server.
Multistage decryption device 1050 is used for the dark text that receiver, video server 1040 sends, and the key that produces management devices 1020 distribution according to key carries out multistage deciphering to the dark text that receives.
This system comprises that further information obtains the center, wherein:
Information is obtained the center, is used for sending the request of expressly asking for to video server 1040;
Video server 1040 obtains expressly by the storage device of video server, and the described plaintext information of sending to is obtained the center.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement etc., all should be included within protection scope of the present invention.
Claims (15)
1, a kind of multi-level encryption method is characterized in that, this method may further comprise the steps:
Cutting apart the protocol Data Unit that receives is data blocks in equal, audio elementary code stream in the divided data piece and/or video elementary code stream are carried out the one-level encryption, audio elementary code stream and/or video elementary code stream after encrypting are converted to transmission code stream, the transmission code stream that is converted to are carried out secondary encrypt.
2, multi-level encryption method according to claim 1 is characterized in that, data blocks in equal length is 1288 bytes.
3, multi-level encryption method according to claim 1 is characterized in that, described one-level is encrypted the different keys of encrypting according to the different time sections acquisition with secondary and carried out.
4, multi-level encryption method according to claim 1 is characterized in that, the data block before and after encrypting adopts different effective signs to represent.
5, a kind of multistage decryption method is characterized in that, this method may further comprise the steps:
Cutting apart the protocol Data Unit that receives is data blocks in equal, transmission code stream in the divided data piece is carried out a level decryption, transmission code stream after the deciphering is converted to audio elementary code stream and/or video elementary code stream, audio elementary code stream and/or the video elementary code stream that is converted to carried out two level decryptions.
6, multistage decryption method according to claim 5 is characterized in that, data blocks in equal length is 1288 bytes.
7, multistage decryption method according to claim 5 is characterized in that, a described level decryption carries out according to the different keys that different time sections obtains with two level decryptions.
8, multistage decryption method according to claim 5 is characterized in that, the data block before and after the deciphering adopts different effective signs to represent.
9, a kind of multi-level encryption device is characterized in that, this device comprises:
Data block is cut apart module, and being used to cut apart the protocol Data Unit that receives is data blocks in equal;
The one-level encrypting module is used for the audio elementary code stream and/or the video elementary code stream of divided data piece are carried out the one-level encryption;
The code stream modular converter is used for audio elementary code stream and/or video elementary code stream after encrypting are converted to transmission code stream;
The secondary encrypting module is used for that the transmission code stream that is converted to is carried out secondary and encrypts.
10, multi-level encryption device according to claim 9 is characterized in that, data block is cut apart module data block is divided into 1288 bytes.
11, multi-level encryption device according to claim 9 is characterized in that, the one-level encrypting module is encrypted according to the different keys that different time sections obtains with the secondary encrypting module.
12, a kind of multistage decryption device is characterized in that, this device comprises:
Data block is cut apart module, and being used to cut apart the protocol Data Unit that receives is data blocks in equal;
The one-level deciphering module is used for the transmission code stream of divided data piece is carried out a level decryption;
The code stream modular converter is used for the transmission code stream after the deciphering is converted to audio elementary code stream and/or video elementary code stream;
The secondary deciphering module is used for the audio elementary code stream and/or the video elementary code stream that are converted to are carried out two level decryptions.
13, multistage decryption device according to claim 12 is characterized in that, data block is cut apart module data block is divided into 1288 bytes.
14, multistage decryption device according to claim 12 is characterized in that, the one-level deciphering module is decrypted according to the different keys that different time sections obtains with the secondary deciphering module.
15, a kind of multi-level encryption decryption system is characterized in that, this system comprises with lower device:
The multi-level encryption device, being used to cut apart the protocol Data Unit that receives is data blocks in equal, audio elementary code stream in the divided data piece and/or video elementary code stream are carried out the one-level encryption, audio elementary code stream and/or video elementary code stream after encrypting are converted to transmission code stream, the transmission code stream that is converted to are carried out secondary encrypt;
Multistage decryption device, being used to cut apart the protocol Data Unit that receives is data blocks in equal, transmission code stream in the divided data piece is carried out a level decryption, transmission code stream after the deciphering is converted to audio elementary code stream and/or video elementary code stream, audio elementary code stream and/or the video elementary code stream that is converted to carried out two level decryptions;
Key generation apparatus is used to produce multi-level encryption device and the required key of multistage decryption device.
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| CN200810115901A CN101621376A (en) | 2008-06-30 | 2008-06-30 | Method, device and system for multi-level encryption and decryption |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104243166A (en) * | 2014-09-05 | 2014-12-24 | 深圳市中兴移动通信有限公司 | Recording encryption method and device |
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| CN105809046A (en) * | 2010-12-15 | 2016-07-27 | 成都科创知识产权研究所 | Efficient encryption method and system of data |
| CN105337722A (en) * | 2014-06-19 | 2016-02-17 | 阿里巴巴集团控股有限公司 | Data encryption method and apparatus |
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| CN104243166A (en) * | 2014-09-05 | 2014-12-24 | 深圳市中兴移动通信有限公司 | Recording encryption method and device |
| WO2016065550A1 (en) * | 2014-10-29 | 2016-05-06 | 柳峰 | Trusted storage and reading method and apparatus for cloud computing |
| CN106372519A (en) * | 2016-08-30 | 2017-02-01 | 江苏博智软件科技有限公司 | Information encryption method and device |
| CN107820685A (en) * | 2017-09-08 | 2018-03-20 | 北京小米移动软件有限公司 | Distributed physical layer method for mapping resource, device, transmitting terminal and receiving terminal |
| CN111510745A (en) * | 2020-03-27 | 2020-08-07 | 曹新 | Internet video data encryption transmission method |
| CN117615079A (en) * | 2024-01-23 | 2024-02-27 | 北京工业大学 | Encryption method and encryption system for image data |
| CN117615079B (en) * | 2024-01-23 | 2024-03-29 | 北京工业大学 | Encryption method and encryption system for image data |
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