CN104735457A - Video encryption and decryption method based on H.264 code - Google Patents
Video encryption and decryption method based on H.264 code Download PDFInfo
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Abstract
The invention discloses a video encryption and decryption method based on an H.264 code. A video frame is encrypted by the encryption and decryption method selectively. The method includes the steps that partly encryption is conducted only on coded H.264 video key frame data, fast deploy can be conducted on a video transmit side which has an encryption requirement, the encryption arithmetic efficiency is improved, and the quality of a real-time video is guaranteed; by means of a general encryption algorithm, great convenience is provided for a client side on the decryption work. The encryption technique does not participate and influence the coding process of a video, an encryption key can be customized by a user, and encryption method of hardware encryption or software encryption can be selected freely.
Description
Technical field
The invention belongs to transmission of video technical field of communication safety and comprising, especially a kind of video encrypting/deciphering method based on H.264 encoding.
Background technology
Present video monitoring system especially IP video camera be all in mode expressly the video data transmission of camera acquisition on server or client, in mode expressly, the video data gathered is kept on external memory card or hard disc of computer, this plaintext transmission and the video data expressly preserved are easy to be intercepted and captured and steal, and there is great potential safety hazard.
Traditional video data cryptographic algorithm is mostly that video data is used as straight binary data, adopts the symmetry cryptographic algorithm such as DES, AES of standard to be directly encrypted, and the usual operand of these algorithms can not meet comparatively greatly the requirement of real-time of video flowing.Some cryptographic algorithm for video code model (such as based on video-encryption H.264) reduce operand to a certain extent, but complicated and diversified Video Encryption Algorithm and client decrypts is loaded down with trivial details, also for the enforcement deployment of system especially brings extreme difficulties on Embedded IP video camera, versatility and actual use value is greatly reduced.
Patent application " 201410279771.9 ", title " a kind of selective cryptographic method based on multi-medium data and device ", publication date " 2014-10-1 ".Propose a kind of method of multi-medium data being carried out to selective encryption, wherein, the selective cryptographic method based on multi-medium data comprises the multi-medium data received from data source, and encodes to described multi-medium data; Adopt predetermined policy from described encoded multi-medium data, select to need the multi-medium data of encryption; To described need encryption multi-medium data adopt predetermined cryptographic algorithm to be encrypted, obtain coding and encryption after multi-medium data; Described multi-medium data after encoding and encrypt is decoded, obtains the multi-medium data after encryption.
Although this invention to some extent solves the larger problem of encrypted multimedia operand, adopt privately owned cryptographic algorithm to have versatility not as standard encryption algorithms such as AES, DES, like this deployment of encipherment scheme and the deciphering of client are made troubles; Meanwhile, this invention realizes based on windows software on the implementation, cannot be implemented on the IP video camera based on especially support hardware encryption on Embedded IP video camera.
Summary of the invention
The present invention is directed to the deficiency of existing H.264 video-encryption technology, especially based on the performance bottleneck of Embedded IP camera video frame encryption, propose a kind of selectivity encryption and decryption scheme based on H.264 encoding, this invention solves transmission and the storage security of embedded IP camera video, also ensure that the requirement of real time of video simultaneously.
Technical scheme:
Based on a video encrypting/deciphering method of H.264 encoding, concrete steps are:
Key K ey is configured by the application program of s1, transmission of video end;
After s2, SoC coding module completes and H.264 encodes, encryption selects module to judge key frame and non-key frame;
S3, the key frame judged by step s2 are encrypted, and finally increase by two byte datas with mark encryption frame and data encryption length at frame data;
S4, the non-key frame key frame after step s3 process and step s2 judged are sent into Streaming Media processing module and are carried out packing encapsulation;
Frame of video after s5, video playback end receiving step s4 process, key frame and non-key frame is gone out by the TYPE type identification of frame header, then by latter two byte acknowledgement frame cipher mode and the data encryption length of frame data, use key K ey to be decrypted process to key frame, in decryption processing, latter two byte data of key frame is deleted;
S6, H.264 decoder decode to the non-key frame that the key frame after step s5 deciphering and step s5 identify and play up broadcasting.
Preferably, in step s2, judge key frame and non-key frame according to the TYPE field of the NALU head of coded data and follow-up data content.
Preferably, be in step s3, the method unrestricted choice of described encryption: undertaken by SoC encrypting module; Or application software carries out.
Wherein, when selecting application software to be encrypted: from the NALU main body of coded data foremost, select data length N to be encrypted, the selection of data length N needs the compromise simultaneously meeting cipher round results and encryption performance.
Wherein, when selecting SoC encrypting module to be encrypted: adopt AES or DES or 3DES algorithm, the NALU body data of key frame is encrypted.
Preferably, in step s4, the RTP/RTCP package module of described packing encapsulation employing standard carries out fluidization treatment to frame of video.
As a kind of scheme, described transmission of video end is the general flow media server playing H.264 video file, and described video playback end is for adding the subscription client of the function of decryption processing described in step s5.
Alternatively, described transmission of video end is the camera of USB access, and described video playback end is for adding the subscription client of the function of decryption processing described in step s5.
Alternatively, described transmission of video end is IP video camera, and described video playback end is for having the monitor client of the function of decryption processing described in step s5.
Generation and the use of described key K ey customize management: manage in the application program of IP video camera; Or manage in the high in the clouds or server of the access of IP video camera, then be issued in the application program of IP video camera.
Beneficial effect:
Encipher-decipher method of the present invention is optionally encrypted frame of video, only carry out Partial encryption for the H.264 Video Key frame data after coding, can rapid deployment to having on the transmission of video end of encryption requirements (the especially Embedded IP video camera of streaming media server), improve cryptographic calculation efficiency, ensure that the quality of real-time video, meanwhile, adopt general cryptographic algorithm also for the decoding effort of client brings great convenience.This encryption technology does not participate in, do not affect the cataloged procedure of video, can by customization encryption key Key, the encryption method of unrestricted choice hardware encipher or software cryptography.
Accompanying drawing explanation
Fig. 1 is the video encrypting/deciphering flow chart in the embodiment of the present invention.
Fig. 2 is the encrypted frame schematic diagram in the embodiment of the present invention.
Fig. 3 is the cipher key configuration schematic diagram in the embodiment of the present invention.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but protection scope of the present invention is not limited thereto:
Embodiment 1: the concrete enforcement of the present invention on embedded IP video camera (IP:Internet Protocol, agreement interconnected between network).
In the present embodiment, the SoC chip (SoC:System-on-a-chip, System on Chip/SoC) of IP video camera comprises SoC coding module, SoC encrypting module, encryption selection module.As shown in Figure 1, when IP camera acquisition to video source after quantizing, send into SoC coding module and H.264 encode.H.264 frame type after encryption selects module to judge coding, if key frame (I frame), sends into SoC encrypting module and is encrypted, if non-key frame, be not encrypted.SoC encrypting module can select hardware encipher or software cryptography mode as required, finally increases by two byte datas with mark encryption frame and data encryption length after encryption at frame data.
H.264 the frame of a standard is by NALU head (NALU:Network Abstract Layer, network abstraction layer unit) and NALU main body composition, judge key frame according to the TYPE field of NALU head and follow-up data content, then NALU body data is sent into SoC encrypting module and be encrypted computing.Select hardware encipher mode in the present embodiment, the key K ey that encryption uses and the cryptographic algorithm that user selects are entered the kernel-driven part of hardware encipher by application deployment, complete relevant encrypted work, as shown in Figure 3 in order to hardware.For generation and the use of key K ey, can be placed in the application program of IP video camera and manage, also can be placed in the high in the clouds of IP video camera access or server and manage, be then issued in the application program of IP video camera, this is according to the network design of IP camera chain.
In certain embodiments, hardware encipher adopts DES (DES:Data Encryption Standard, DEA) or AES (AES:Advanced Encryption Standard, Advanced Encryption Standard) or 3DES cryptographic algorithm.
Embodiment 2: this invention is deployed on the IP video camera without encryption hardware, selects software cryptography mode in the present embodiment, above-mentioned encryption selects module directly key frame data to be sent in application program, is completed the software cryptography work of standard by application program.Software cryptography mode uses the storehouse of increasing income of standard, and software cryptography uses the aes cryptographic algorithm in openssl storehouse in preferred embodiments.Composition graphs 2, key frame, in the process of encryption, can be selected to be encrypted the partial data of NALU body data, can reduce cryptographic calculation amount so to a certain extent.Enciphered data can from NALU main body foremost, data length N is selected to be encrypted, the selection of data length N needs the compromise simultaneously meeting cipher round results and encryption performance, and the determination of length N needs user to carry out debugging confirmation when implementing according to concrete network environment and hardware resource.
In embodiment 1 and embodiment 2, key frame after encryption, finally increases by two byte datas at the frame data of key frame, with mark encryption frame and data encryption length.Key frame after encryption and the non-key frame of not encrypting all send into Streaming Media processing module, packing encapsulation is carried out to frame of video, because described encryption method does not destroy NALU head, so can directly adopt the RTP/RTCP package module of standard to carry out fluidization treatment to the H.264 frame after encryption, be then sent to the monitor client of network side.
After video packets of data is sent to monitor client by network, first monitor client unpacks process to video data, TYPE type according to NALU head judges encrypted frame data, then by latter two byte acknowledgement frame cipher mode and the data encryption length of frame data, use key K ey to be decrypted process, in decryption processing, latter two byte data of key frame is deleted; If non-encrypted frame, be not decrypted process, directly send into and H.264 carry out decoding, then playing up broadcasting in decoder.
Monitor client, when accessing IP video camera, after authentication, obtains key K ey; Different according to networking, monitor client also can obtain key K ey from the high in the clouds network or server, and in order to complete the decryption work of monitor client, therefore, the management work of key K ey can be implemented flexibly according to the network environment of IP camera chain.
In other embodiments, with the camera substitute I P video camera of USB access, the subscription client adding decryption processing function replaces monitor client; Or to play the general flow media server substitute I P video camera of H.264 video file, the subscription client adding decryption processing function replaces monitor client.The present invention can be disposed enforcement all equally.
Specific embodiment described herein is only illustrate spirit of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (10)
1., based on a video encrypting/deciphering method of H.264 encoding, it is characterized in that concrete steps are:
Key K ey is configured by the application program of s1, transmission of video end;
After s2, SoC coding module completes and H.264 encodes, encryption selects module to judge key frame and non-key frame;
S3, the key frame judged by step s2 are encrypted, and finally increase by two byte datas with mark encryption frame and data encryption length at the frame data of key frame;
S4, the non-key frame key frame after step s3 process and step s2 judged are sent into Streaming Media processing module and are carried out packing encapsulation;
Frame of video after s5, video playback end receiving step s4 process, key frame and non-key frame is gone out by the TYPE type identification of frame header, then by latter two byte acknowledgement frame cipher mode and the data encryption length of frame data, use key K ey to be decrypted process to key frame, in decryption processing, latter two byte data of key frame is deleted;
S6, H.264 decoder decode to the non-key frame that the key frame after step s5 deciphering and step s5 identify and play up broadcasting.
2. a kind of video encrypting/deciphering method based on H.264 encoding according to claim 1, is characterized in that in step s2, judges key frame and non-key frame according to the TYPE field of the NALU head of coded data and follow-up data content.
3. a kind of video encrypting/deciphering method based on H.264 encoding according to claim 1, is characterized in that in step s3, the method unrestricted choice of described encryption: undertaken by SoC encrypting module; Or application software carries out.
4. a kind of video encrypting/deciphering method based on H.264 encoding according to claim 3, when it is characterized in that selecting application software to be encrypted: from the NALU main body of coded data foremost, select data length N to be encrypted, the selection of data length N needs the compromise simultaneously meeting cipher round results and encryption performance.
5. a kind of video encrypting/deciphering method based on H.264 encoding according to claim 3, when is characterized in that selecting SoC encrypting module to be encrypted: adopt AES or DES or 3DES algorithm, be encrypted the NALU body data of key frame.
6. a kind of video encrypting/deciphering method based on H.264 encoding according to claim 1, is characterized in that in step s4, and the RTP/RTCP package module of described packing encapsulation employing standard carries out fluidization treatment to frame of video.
7. according to claims 1 to 6 any one is based on the video encrypting/deciphering method of H.264 encoding, it is characterized in that described transmission of video end is the general flow media server playing H.264 video file, described video playback end is for adding the subscription client of the function of decryption processing described in step s5.
8. according to claims 1 to 6 any one is based on the video encrypting/deciphering method of H.264 encoding, it is characterized in that described transmission of video end is the camera of USB access, described video playback end is for adding the subscription client of the function of decryption processing described in step s5.
9. according to claims 1 to 6 any one is based on the video encrypting/deciphering method of H.264 encoding, and it is characterized in that described transmission of video end is IP video camera, described video playback end is for having the monitor client of the function of decryption processing described in step s5.
10. a kind of video encrypting/deciphering method based on H.264 encoding according to claim 9, is characterized in that the generation of described key K ey and uses customization management: managing in the application program of IP video camera; Or manage in the high in the clouds or server of the access of IP video camera, then be issued in the application program of IP video camera.
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| WO2021249028A1 (en) * | 2020-06-08 | 2021-12-16 | 华为技术有限公司 | Data encryption or decryption method, apparatus and system |
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