CN105763887A - Blowfish algorithm-based H.264 video coding method and transmission encryption system - Google Patents
Blowfish algorithm-based H.264 video coding method and transmission encryption system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/643—Communication protocols
- H04N21/6437—Real-time Transport Protocol [RTP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
- H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/254—Management at additional data server, e.g. shopping server, rights management server
- H04N21/2541—Rights Management
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Abstract
The invention discloses a Blowfish algorithm-based H.264 video transmission encryption method, which is characterized by comprising a terminal module, an RTSP agent module, and a video source registration and data server module, wherein the terminal module is used for acquiring a video and transmitting the video to a video server, acquiring a video file from a video database and online playing the video file; the RTSP agent module is used for authenticating the terminal and forwarding a video stream and shielding the video source server; the video source database module is used for storing information of all video acquisition terminals and using an RTSP agent to acquire the information of the terminals via the database; and the video source registration server module is used for being in charge of online registration for the video acquisition terminals. The method of the invention has the beneficial effects that the method is based on the H.264 video coding method and based on the Blowfish algorithm, good compromise between safety and encryption efficiency is acquired in a condition of not reducing the algorithm security, a video encryption transmission model is built, and the feasibility of the method is verified.
Description
Technical field
The present invention relates to a kind of H.264 method for video coding based on Blowfish algorithm and transmission encrypting system, belong to technical field of data security.
Background technology
Along with the fast development of computer technology and network technology, network multimedia service becomes application new in network service.But opening and the anonymity due to network so that the content of multimedia of transmission over networks is easily subject to attack.And traditional Video Encryption Algorithm can not meet the requirement of heterogeneous networks multimedia service, how to design the Video Encryption Algorithm meeting different application demand, particularly significant with the safety protecting video content.H.264 it is one of current most popular video encoding standard, compared with traditional video encoding standard, H.264 can obtain less code check when equivalent video quality, but with the computation complexity that is significantly increased for cost.Some characteristics (as big in data volume, requirement of real-time is high, storage format is various) due to video itself, video flowing is encrypted inefficient with DES algorithm, and the encryption performance of Blowfish algorithm is better than DES algorithm, it has, and enciphering rate is fast, compact, key length is variable, can the free feature such as use.
H.264 being currently up-to-date video encoding standard, it, because having good network characteristic and efficient code efficiency, is used widely in various Network Video Transmission.Chinese scholars has done substantial amounts of research work for H.264 video-encryption field, and wherein Choice encryption algorithm has become the main direction of studying of video-encryption.This kind of algorithm requires that ciphering process combines with the form of video data, and can according to the difference of security requirement, the sensitive data that Choice encryption is different, this kind of algorithm is generally of relatively low computation complexity, there is stronger data interoperability, be suitable for wider application.
It is fast that symmetric key cryptosystem has encryption/decryption speed, the advantage that degree of safety is high.Stream cipher passes through united application combinational network and other sequence method, produces more complicated network, and in the hope of realizing more complicated sequence, stream cipher compares difficult control theoretically, and great majority need to be realized by hardware, and speed there is not the fast of symmetric key.Blowfish grows up for 1994, also referred to as Fugu ocellatus algorithm, is a kind of symmetric block cipher algorithm, and key length is variable, and its safety is significantly high, there is presently no and is cracked.This algorithm only used some simple calculations: based on 32 add, XOR with table look-up, and algorithm runs only needs the many internal memories of 4K even less.Code length is comparatively short, and the demand of ROM is also little.This algorithm has that enciphering rate is fast, compact, key length is variable, can the free feature such as use.Several groups on WSN experiments show that, relative to other several symmetric encipherment algorithms, Blowfish has superiority on encryption and decryption time and output.
Summary of the invention
For solving the deficiencies in the prior art, it is an object of the invention to provide a kind of H.264 transmission of video encryption method based on Blowfish algorithm, carry out encryption and decryption with Blowfish algorithm to based on the video H.264 encoded, reach transmission of video apply in real time, safety demand.
In order to realize above-mentioned target, the present invention adopts the following technical scheme that:
A kind of based on Blowfish algorithm H.264 method for video coding, it is characterised in that to include key pretreatment and information two processes of encryption, specific as follows:
1.1 key pretreatment
Sub-key is calculated by Blowfish and gets, and step is as follows:
1. P array and S box is initialized by the hexadecimal string of π；
2. first 32 XOR of P1 and key, P2 and second, by that analogy；Key rotation uses, until whole P array is all replaced；
3. encrypting full 0 string with Blowfish, sub-key is the sub-key described in the 2nd step；
4. P1 and P2 is replaced in the 3rd step output；
5. encrypting the 3rd step output with Blowfish, sub-key is after amendment；
6. P3 and P4 is replaced in the 5th step output；
7. repeat this process, until P array is completely replaced, then exports result order with the Blowfish of continuous transformation and replace S box；
1.2 information encryptions
Information encryption BlowfishEncipher () realizes；First, with 2n byte sequence a1,a2,…,a2nRepresent an I frame, then this sequence is divided into two parts a1,a3,…,a2n-1And a2,a4,…,a2n, one is odd sequence, and one is even sequence；The two n byte sequence is carried out XOR and obtains sequence C=c1,c2,…,cn；At this moment BlowfishEncipher () is used, odd sequence is encrypted, it it is one group by odd sequence every 64 of order from left to right, each group of sequence is divided into two halves, XL and XR is respectively 32bit, and ciphering process is the Feistel net of 16 layers, and the plaintext encrypting 64 needs iteration 16 times, the process of iteration uses sub-key key_pbox [i] generated above, generates the ciphertext of 64；Finally the odd sequence after encryption and sequence C are spliced.
A kind of H.264 transmission of video encryption method based on Blowfish algorithm, is characterized in that, including terminal module, RTSP proxy module, video source registration and data server module；
Described terminal module, for gathering video and being transferred to video server, can obtain video file from video database and play online simultaneously；
Described RTSP proxy module is for authenticating to terminal and forward video flowing, mute video source server；
Described video source data library module is for storing the information of all video acquisition terminals, and makes RTSP agency be obtained the information of terminal by this data base；Described video source registration server module is for being responsible for the registration of reaching the standard grade of video acquisition terminal
Aforesaid a kind of H.264 transmission of video encryption method based on Blowfish algorithm, is characterized in that, described terminal module is divided into two major functions, and first function, for gathering video and being transferred on video server, is play online for all terminals；Second function can obtain video file from video database and play online.
Aforesaid a kind of H.264 transmission of video encryption method based on Blowfish algorithm, it is characterized in that, described RTSP proxy module is for verifying whether each terminal has the right of access system, and be responsible for forwarding video flowing between terminal and video source server, terminal is shielded video source server, to ensure the safety of video data.
Aforesaid a kind of H.264 transmission of video encryption method based on Blowfish algorithm, it is characterized in that, described video source data library module comprises two aspects, on the one hand for storing the video information that all terminals gather, on the other hand, terminal obtains video data information by RTSP agency to video source data storehouse, thus realizing online playing function；Described video source registration server module is for being responsible for the registration of reaching the standard grade of video acquisition terminal.
The beneficial effect that the present invention reaches: native system is based on data mining technology, based on C4.5 algorithm, accurately extracts the feature of flood attack from substantial amounts of network traffics, sets up flood attack detection model, improve the accuracy of flood attack detection.
Accompanying drawing explanation
Fig. 1 is the video-encryption flow chart of the present invention
Fig. 2 is the system structure schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.Following example are only for clearly illustrating technical scheme, and can not limit the scope of the invention with this.
This method is based on H.264 Video coding mode, based on Blowfish algorithm, obtains the better trade-off between safety and encryption efficiency when not reducing algorithm security, sets up video-encryption mode, the feasibility of checking the method.
Blowfish algorithm is the block encryption algorithm of a kind of symmetry, and this algorithm has core encryption function a: BF_En (), and the input of this function is 64 cleartext informations, through computing, exports with the form of 64 cipher-text information.By Blowfish algorithm for encryption information, it is necessary to two processes: key pretreatment and information encryption.It is described in detail as follows.
Key pretreatment: sub-key is calculated by Blowfish and gets: 1. initialized P array and S box by the hexadecimal string of π；2. first 32 XOR of P1 and key, P2 and second, by that analogy.Key rotation uses, until whole P array is all replaced；3. # encrypts full 0 string with Blowfish, and sub-key is the sub-key described in the 2nd step；4. P1 and P2 is replaced in the 3rd step output；5. encrypting the 3rd step output with Blowfish, sub-key is after amendment；6. P3 and P4 is replaced in the 5th step output；7. repeat this process, until P array is completely replaced, then exports result order with the Blowfish of continuous transformation and replace S box.The sub-key of Blowfish algorithm and S box are all generated by algorithm itself, and key distribution is highly difficult.
Information encryption flow is as shown in Figure 1.Information encryption realizes with BlowfishEncipher () in a program.First, with 2n byte sequence a1,a2,…,a2nRepresent an I frame, then this sequence is divided into two parts a1,a3,…,a2n-1And a2,a4,…,a2n, one is odd sequence, and one is even sequence.The two n byte sequence is carried out XOR and obtains sequence C=c1,c2,…,cn.At this moment BlowfishEncipher () is used, odd sequence is encrypted, it it is one group by odd sequence every 64 of order from left to right, each group of sequence is divided into two halves, XL and XR is respectively 32bit, and ciphering process is the Feistel net of 16 layers, and the plaintext encrypting 64 needs iteration 16 times, the process of iteration uses sub-key key_pbox [i] generated above, generates the ciphertext of 64.Finally the odd sequence after encryption and sequence C are spliced.This algorithm only need to encrypt the data volume of I frame half.
Video-encryption mode concrete structure is as in figure 2 it is shown, include terminal module, RTSP proxy module, video source registration and data server module.
Wherein, terminal module, for gathering video and being transferred to video server, can obtain video file from video database and play online simultaneously；RTSP proxy module is for authenticating to terminal and forward video flowing, mute video source server；Video source data library module is for storing the information of all video acquisition terminals, and makes RTSP agency be obtained the information of terminal by this data base；Video source registration server module is for being responsible for the registration of reaching the standard grade of video acquisition terminal.
Terminal module is divided into two major functions, and first function, for gathering video and being transferred on video server, is play online for all terminals；Second function can obtain video file from video database and play online.
RTSP proxy module is for verifying whether each terminal has the right of access system, and is responsible for forwarding video flowing between terminal and video source server, terminal is shielded video source server, to ensure the safety of video data.
Video source data library module comprises two aspects, and on the one hand for storing the video information that all terminals gather, on the other hand, terminal obtains video data information by RTSP agency to video source data storehouse, thus realizing online playing function；Video source registration server module is for being responsible for the registration of reaching the standard grade of video acquisition terminal.
Build a test platform below and carry out actual video transmission encryption experiment.Test platform is using common PC as experiment porch, and PC is configured that, IntelCOREi7 processor, 8GB internal memory, and operating system is Windows8.1.We utilize the official's reference software 10.2 in H.264 to realize the algorithm above design, utilize VS2013 to complete the debugging to JM code and compiling.
Using news and the hall_monitor of CIF form as experiment video sequence in experiment, it is encoded cryptographic operation by encryption method mentioned above.In encoder-side, set coding parameter as: with IPPP ... P mode is encoded, I frame refresh rate is 10, and frame per second is that 30 frames are per second, uses self-defined FMO pattern to be encoded.In an encoding process, pay close attention to the code stream parameter of encoder output, the performance of encryption is analyzed；In decoder end, because adopting herein, fixed length syntactic element being encrypted operation, maintaining the semantic compatibility of video, use decoder can be made directly decoding, obtain the image after encryption is upset.
Safety analysis: the safety of encryption rear video includes two aspects, Video security after encryption and the safety of AES itself.The all or part of information of Video security and video is hidden so that the video after encryption can not by the correct perception of people.
Performance evaluation: from ciphering process it can be seen that follow-up entropy code process is had no effect by algorithm herein substantially, therefore, this method is only small on the impact of video compression ratio.It is as shown in table 1 that algorithm realizes result:
Table 1: encryption front-and rear-view frequency sequence size (respectively 100 frame)
| Video sequence | Encryption preceding document size (byte) | File size (byte) after encryption |
| news | 125,181 | 125,328 |
| hall_monitor | 125,009 | 125,613 |
Claims (2)
1. one kind based on Blowfish algorithm H.264 method for video coding, it is characterised in that include key pretreatment and information two processes of encryption, specific as follows:
1.1 key pretreatment
Sub-key is calculated by Blowfish and gets, and step is as follows:
1. P array and S box is initialized by the hexadecimal string of π；
2. first 32 XOR of P1 and key, P2 and second, by that analogy；Key rotation uses, until whole P array is all replaced；
3. encrypting full 0 string with Blowfish, sub-key is the sub-key described in the 2nd step；
4. P1 and P2 is replaced in the 3rd step output；
5. encrypting the 3rd step output with Blowfish, sub-key is after amendment；
6. P3 and P4 is replaced in the 5th step output；
7. repeat this process, until P array is completely replaced, then exports result order with the Blowfish of continuous transformation and replace S box；
1.2 information encryptions
Information encryption BlowfishEncipher () realizes；First, with 2n byte sequence a1,a2,…,a2nRepresent an I frame, then this sequence is divided into two parts a1,a3,…,a2n-1And a2,a4,…,a2n, one is odd sequence, and one is even sequence；The two n byte sequence is carried out XOR and obtains sequence C=c1,c2,…,cn；At this moment BlowfishEncipher () is used, odd sequence is encrypted, it it is one group by odd sequence every 64 of order from left to right, each group of sequence is divided into two halves, XL and XR is respectively 32bit, and ciphering process is the Feistel net of 16 layers, and the plaintext encrypting 64 needs iteration 16 times, the process of iteration uses sub-key key_pbox [i] generated above, generates the ciphertext of 64；Finally the odd sequence after encryption and sequence C are spliced.
2., based on a H.264 video transmission encrypting system for Blowfish algorithm, described system includes terminal module, RTSP proxy module, video source registration server module and video source data library module；It is characterized in that:
Described terminal module, for gathering video and being transferred to video server, obtains video file simultaneously from video source data library module and plays online；
Described RTSP proxy module is for authenticating to terminal and forward video flowing, mute video source server；
Described video source data library module is for storing the information of all video acquisition terminals, and makes RTSP agency be obtained the information of terminal by this data base；
Described video source registration server module is for being responsible for the registration of reaching the standard grade of video acquisition terminal.
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Application publication date: 20160713 |