CN110730366A - Bit operation-based lightweight video stream encryption and decryption method and encryption and decryption mechanism - Google Patents
Bit operation-based lightweight video stream encryption and decryption method and encryption and decryption mechanism Download PDFInfo
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- CN110730366A CN110730366A CN201911041106.5A CN201911041106A CN110730366A CN 110730366 A CN110730366 A CN 110730366A CN 201911041106 A CN201911041106 A CN 201911041106A CN 110730366 A CN110730366 A CN 110730366A
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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, manipulating MPEG-4 scene graphs
- H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
- H04L9/0643—Hash functions, e.g. MD5, SHA, HMAC or f9 MAC
Abstract
The invention discloses a bit operation-based lightweight video stream encryption and decryption method and an encryption and decryption mechanism, and particularly relates to a bit operation-based lightweight video stream encryption method, wherein the bit operation mode comprises the following encryption process of obtaining encrypted video data from plaintext video data: generating a random feature key plaintext data, and encrypting the feature key plaintext data through md5 to generate feature key ciphertext data; the feature key ciphertext data is exchanged to a video stream receiving side through a network signaling channel; the technical scheme adopted by the invention is as follows: 1. compared with the traditional encryption method, the video stream mode based on bit operation is simpler and more portable. 2. The invention is more efficient for encrypting the real-time video stream due to the simple encryption mode and the simple bit operation method. 3. The invention also ensures the security of the video stream, steals all key files in time, and only the un-cracked encryption method and the un-cracked characteristic key ciphertext data are used, so that the video encryption data are still secure.
Description
Technical Field
The invention relates to the technical field of video stream encryption and decryption, in particular to a bit operation-based lightweight video stream encryption and decryption method and an encryption and decryption mechanism.
Background
In the current network information era, the security and confidentiality of data, such as monitoring videos, video on demand, video conferences and the like, are particularly concerned. Conventional Encryption algorithms such as des (data Encryption standard) and aes (advanced Encryption standard) mainly use keys to perform complex calculation and replacement on data to achieve data Encryption, but for video stream data with huge data volume, the conventional Encryption algorithms ensure security, but are difficult to implement on software in Encryption speed, and increase media data volume after Encryption. Conventional encryption algorithms are not and are not suitable in terms of video streaming. Therefore, a bit operation-based lightweight video stream encryption and decryption method and an encryption and decryption mechanism are provided, so that efficient encryption and decryption are achieved, and meanwhile the safety of data is guaranteed.
Disclosure of Invention
Aiming at the problems in the background technology, the invention provides a bit operation-based lightweight video stream encryption and decryption method and an encryption and decryption mechanism, so that high-efficiency encryption and decryption are achieved, and meanwhile, the safety of data is ensured.
The invention provides a bit operation-based lightweight video stream encryption method, wherein an encryption process for obtaining encrypted video data from plaintext video data in a bit operation mode is as follows:
step 1.1, generating a random feature key plaintext data, and encrypting the feature key plaintext data through md5 to generate feature key ciphertext data; the feature key ciphertext data is exchanged to a video stream receiving side through a network signaling channel;
step 1.2, generating n different key files, and performing bit operation on the n different key files by using the feature key plaintext data to generate n new different feature key files;
step 1.3, dividing m video data blocks with the same data length for each frame by taking one frame of frame data as basic data for the video stream naked code data (H264); then, using n new different feature key files generated in the step 1.2 to perform bit operation on m video data blocks of each frame to generate new ciphertext H264 frame video data;
and step 1.4, encapsulating the video data of the ciphertext H264 frame into an RTP packet and sending the RTP packet to a receiving end.
Based on the bit operation-based lightweight video stream encryption method, the invention also provides a bit operation-based lightweight video stream decryption method, and the decryption process for obtaining plaintext video data by inverse operation of ciphertext video data is as follows:
step 2.1, copying the n parts of the key files with different n into a memory of a video stream receiving side;
2.2, receiving the feature key ciphertext data from the network signaling exchange channel, and decrypting the feature key ciphertext data by using an md5 method to obtain feature key plaintext data;
step 2.3, bit operation is carried out on n different key files by using the feature key plaintext data to generate n new different feature key files;
and 2.4, receiving an RTP packet from the network, splitting and combining the RTP packet to obtain encrypted ciphertext H264 frame data, dividing each frame of video data into m video data blocks, and finally performing bit operation decryption on the m video data blocks by using n new different feature key files to obtain plaintext H264 frame data.
The invention provides a bit operation-based lightweight video stream encryption and decryption mechanism, which comprises the following steps:
step 1, taking a byte from the feature key plaintext data, taking an integer with a numeric range of-256 to 256, taking a random number from the data in the range, and generating the feature key plaintext data;
step 2, encrypting the feature key plaintext data by an md5 method to generate corresponding feature key ciphertext data;
step 3, taking 128 bytes from the key file, randomly generating 128 random integers according to the value range of each byte from-256 to 256; according to the general value of 1500 bytes of a network MTU, the corresponding key file is 1500/128 at most, namely 12; a different key file can be used for each video data block to complete encryption;
step 4, taking 128 bytes of the frame data video data block; the encryption mode is the first one, 12 key files are numbered from 1 to 12, if 12 video data blocks exist in frame data and are numbered from 1 to 12, the key file is numbered from 1 frame data video data block number 1, the key file is numbered from 2 frame data video data block numbers 2, and so on, the encryption is correspondingly performed in a one-to-one matching manner; if the number of the frame data video data blocks is less than 12, only the files numbered in front of the key file and the video data blocks are correspondingly encrypted in a one-to-one matching mode; in the second encryption mode, the number of the key files is less than 12, and if the number of the frame data video data blocks is greater than the number of the key files, the key files are selected in a multi-polling mode; if the number of the key files is only 3 and the number of the video data blocks is 10, the 1 st to 3 rd video data blocks are encrypted by the key file numbers 1 to 3, the 4 th to 6 th video data blocks are encrypted by the key file numbers 1 to 3, and the like, so that the encryption of all the video data blocks is completed;
step 5, encryption modes of the key file and the video data blocks are adopted, and the key file of 128 bytes and the video data blocks of 128 bytes are subjected to bit inversion operation in a byte-to-byte correspondence mode; if the number of the video data block bytes is less than 128, the video data block is not supplemented with bytes, and the amount of data is encrypted;
step 6, after the frame data encrypted data are obtained, packaging an RTP packet according to a standard H264 fragmentation rule;
and 7, decrypting, performing inverse operation on all the ciphertexts to obtain plaintext data, and finally obtaining the plaintext video stream.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the traditional encryption method, the video stream mode based on bit operation is simpler and more portable.
2. The invention is more efficient for encrypting the real-time video stream due to the simple encryption mode and the simple bit operation method.
3. The invention also ensures the security of the video stream, steals all key files in time, and only the un-cracked encryption method and the un-cracked characteristic key ciphertext data are used, so that the video encryption data are still secure.
Drawings
FIG. 1 is a schematic block diagram of bit-based lightweight video stream encryption in the present invention;
fig. 2 is a schematic block diagram of bit-based lightweight video stream decryption in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first objective of the present invention is to provide a bit-operation-based lightweight video stream encryption method, and referring to fig. 1, the encryption process for obtaining encrypted video data from plaintext video data by a simple bit operation method is illustrated as follows:
step 1, generating a random feature key plaintext data, and encrypting the feature key plaintext data through md5 to generate feature key ciphertext data. The feature key ciphertext data is exchanged to the video stream receiving side through a network signaling channel.
And 2, generating n different key files, and performing bit operation on the n different key files by using the feature key plaintext data to generate n new different feature key files.
And 3, dividing m video data blocks with the same data length for each frame by taking one frame of frame data as basic data for the video stream naked code data (H264). And then, performing bit operation on m video data blocks per frame by using n new different feature key files generated in the step 2 to generate new ciphertext H264 frame video data.
And 4, encapsulating the encrypted H264 frame video data into an RTP packet and sending the RTP packet to a receiving end.
The second objective of the present invention is to provide a bit-operation-based lightweight video stream decryption method, referring to fig. 2, illustrating the decryption process of obtaining plaintext video data by inverse operation of ciphertext video data as follows:
step 1, copying the n parts of different key files to a memory of a video stream receiving side;
step 2, feature key ciphertext data are received from the network signaling exchange channel, and the feature key ciphertext data are decrypted by using an md5 method to obtain feature key plaintext data;
step 3, bit operation is carried out on n different key files by using the feature key plaintext data to generate n new different feature key files;
step 4, receiving an RTP packet from the network, splitting and combining the RTP packet to obtain encrypted ciphertext H264 frame data, dividing each frame of video data into m video data blocks, and finally performing bit operation decryption on the m video data blocks by using n new different feature key files to obtain plaintext H264 frame data;
the third purpose of the present invention is to set forth a mechanism for encrypting and decrypting a lightweight video stream based on bit operations, which is specifically as follows:
step 1, taking one byte of feature key plaintext data, taking an integer with a numeric range of-256 to 256, taking a random number for the data in the range, and generating the feature key plaintext data;
step 2, encrypting the feature key plaintext data by an md5 method to generate corresponding feature key ciphertext data;
and 3, taking 128 bytes from the key file, randomly generating 128 random integers according to the value range of each byte from-256 to 256. According to the general value of 1500 bytes of the network MTU, the corresponding key file is 1500/128 at most, which is 12. A different key file can be used for each video data block to complete encryption;
and step 4, taking 128 bytes of the frame data video data block. The first encryption mode is that 12 key files are numbered from 1 to 12, if 12 video data blocks exist in frame data and the numbers are from 1 to 12, the key file is numbered from 1 frame data video data block number 1, the key file is numbered from 2 frame data video data block numbers 2, and so on, the encryption is correspondingly performed in a one-to-one matching manner. If the number of the frame data video data blocks is less than 12, only the files with the numbers in front of the key file and the video data blocks are correspondingly encrypted in a one-to-one matching mode. In the second encryption mode, the number of the selected key files is less than 12, and if the number of the frame data video data blocks is greater than the number of the key files, the key files are selected in a multi-polling mode. If the number of the key files is only 3 and the number of the video data blocks is 10, the 1 st to 3 rd video data blocks are encrypted by the key file numbers 1 to 3, the 4 th to 6 th video data blocks are encrypted by the key file numbers 1 to 3, and the like, so that the encryption of all the video data blocks is completed;
and 5, encrypting the key file and the video data blocks, and performing bit inversion operation on the key file of 128 bytes and the video data blocks of 128 bytes in a one-to-one byte correspondence manner. If the number of the video data block bytes is less than 128, the video data block is not supplemented with bytes, and the amount of data is encrypted;
step 6, after the encrypted data of the frame data are obtained, packaging an RTP packet according to a standard H264 fragmentation rule;
and 7, decrypting, namely performing inverse operation on all the ciphertexts to obtain plaintext data, and finally obtaining the plaintext video stream.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principle and embodiments of the present invention have been described herein by way of specific examples, which are provided only to help understand the method and the core idea of the present invention, and the above is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes can be made without departing from the principle of the present invention, and the above technical features can also be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (3)
1. A bit operation-based lightweight video stream encryption method is characterized in that an encryption process for obtaining encrypted video data from plaintext video data in a bit operation mode is as follows:
step 1.1, generating a random feature key plaintext data, and encrypting the feature key plaintext data through md5 to generate feature key ciphertext data; the feature key ciphertext data is exchanged to a video stream receiving side through a network signaling channel;
step 1.2, generating n different key files, and performing bit operation on the n different key files by using the feature key plaintext data to generate n new different feature key files;
step 1.3, dividing m video data blocks with the same data length for each frame by taking one frame of frame data as basic data for the video stream naked code data (H264); then, using n new different feature key files generated in the step 1.2 to perform bit operation on m video data blocks of each frame to generate new ciphertext H264 frame video data;
and step 1.4, encapsulating the video data of the ciphertext H264 frame into an RTP packet and sending the RTP packet to a receiving end.
2. The bit-operation-based lightweight video stream decryption method of claim 1, wherein the decryption process for obtaining plaintext video data by inverse operation of ciphertext video data is as follows:
step 2.1, copying the n parts of the key files with different n into a memory of a video stream receiving side;
2.2, receiving the feature key ciphertext data from the network signaling exchange channel, and decrypting the feature key ciphertext data by using an md5 method to obtain feature key plaintext data;
step 2.3, bit operation is carried out on n different key files by using the feature key plaintext data to generate n new different feature key files;
and 2.4, receiving an RTP packet from the network, splitting and combining the RTP packet to obtain encrypted ciphertext H264 frame data, dividing each frame of video data into m video data blocks, and finally performing bit operation decryption on the m video data blocks by using n new different feature key files to obtain plaintext H264 frame data.
3. A bit operation-based encryption and decryption mechanism for a lightweight video stream is characterized by comprising the following steps:
step 1, taking a byte from the feature key plaintext data, taking an integer with a numeric range of-256 to 256, taking a random number from the data in the range, and generating the feature key plaintext data;
step 2, encrypting the feature key plaintext data by an md5 method to generate corresponding feature key ciphertext data;
step 3, taking 128 bytes from the key file, randomly generating 128 random integers according to the value range of each byte from-256 to 256; according to the general value of 1500 bytes of a network MTU, the corresponding key file is 1500/128 at most, namely 12; a different key file can be used for each video data block to complete encryption;
step 4, taking 128 bytes of the frame data video data block; the encryption mode is the first one, 12 key files are numbered from 1 to 12, if 12 video data blocks exist in frame data and are numbered from 1 to 12, the key file is numbered from 1 frame data video data block number 1, the key file is numbered from 2 frame data video data block numbers 2, and so on, the encryption is correspondingly performed in a one-to-one matching manner; if the number of the frame data video data blocks is less than 12, only the files numbered in front of the key file and the video data blocks are correspondingly encrypted in a one-to-one matching mode; in the second encryption mode, the number of the key files is less than 12, and if the number of the frame data video data blocks is greater than the number of the key files, the key files are selected in a multi-polling mode; if the number of the key files is only 3 and the number of the video data blocks is 10, the 1 st to 3 rd video data blocks are encrypted by the key file numbers 1 to 3, the 4 th to 6 th video data blocks are encrypted by the key file numbers 1 to 3, and the like, so that the encryption of all the video data blocks is completed;
step 5, encryption modes of the key file and the video data blocks are adopted, and the key file of 128 bytes and the video data blocks of 128 bytes are subjected to bit inversion operation in a byte-to-byte correspondence mode; if the number of the video data block bytes is less than 128, the video data block is not supplemented with bytes, and the amount of data is encrypted;
step 6, after the frame data encrypted data are obtained, packaging an RTP packet according to a standard H264 fragmentation rule;
and 7, decrypting, performing inverse operation on all the ciphertexts to obtain plaintext data, and finally obtaining the plaintext video stream.
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| CN110730366B (en) | 2021-08-27 |
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