CN109951735B - Video playing address analysis obtaining method, system and medium - Google Patents
Video playing address analysis obtaining method, system and medium Download PDFInfo
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Abstract
The invention discloses a method, a system and a medium for analyzing and acquiring a video playing address, wherein the implementation steps of the invention comprise that a client sends a playing address request aiming at a target video id to a playing back end; receiving an encrypted video file playing address and target file id information returned by a playing back end; generating a decryption key according to the encryption of the target video id information, the target file id information and the encryption parameter appointed by the playing back endd(ii) a Over-decryption keydAnd decrypting the encrypted video file playing address to obtain a real video file playing address. The invention realizes a safe video playing address analyzing and acquiring mechanism, only an authorized client can acquire the playing address under normal conditions, improves the threshold of acquiring the playing address by a third party hotlink, can solve the problem of hotlink of video files and reduces the operation cost of a video content service provider.
Description
Technical Field
The invention relates to a video-on-demand technology, in particular to a method, a system and a medium for analyzing and acquiring a video playing address.
Background
The existing video content service providers generally provide services for APP and PC websites by providing access ports to the outside, and the ports provide standard http services. For the playing process, before playing a certain video, the APP needs to obtain a playing address, and sends a request to the playing back end, the request has video id information, the playing back end can give a playing address of each definition, and the APP back end selects the playing address with corresponding definition to start playing according to the definition setting of playing. When the user switches the definition, the playing address with the definition appointed by the user is selected for playing. Because of the standard http service, besides that the app of the app can request the playing back end to obtain the playing address, another third party (such as a hotlinking user) can also request the playing back end to obtain the playing address.
Current security control techniques focus primarily on restricting the use of playback addresses. If the playing address has expiration time, the address cannot be used after expiration, and the situation that a third party reuses the playing address is avoided; if the information related to the user and the app is added into the playing address, when the playing address is used for downloading the social frequency, the user and the app using the playing address are checked to determine whether the information is consistent with the information in the playing address, and therefore the playing address is prevented from being embezzled by a third party. Due to the lack of authentication of the app, no mechanism is provided for third parties to play addresses. Therefore, how to prevent a third party (such as a hotlinking user) from stealing video playing address resources becomes a key technical problem to be solved urgently.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the invention provides a method, a system and a medium for analyzing and acquiring a video playing address, which realize a safe mechanism for analyzing and acquiring the video playing address, only an authorized client can acquire the playing address under normal conditions, thereby improving the threshold of acquiring the playing address by a third party stealing link, and the third party can simulate the normal client to acquire the playing address only by cracking the playing control algorithm in the improvement and taking the core parameters of the algorithm, thereby effectively solving the problem of stealing link of the video file, reducing the operation cost of a video content service provider and improving the use experience of a legal user.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method for analyzing and acquiring a video file playing address comprises the following implementation steps:
1) the client sends a play address request aiming at the target video id to the play back end;
2) the client receives the playing address of the encrypted video file and the id information of the target file returned by the playing back end;
3) the client encrypts and generates a decryption key according to the target video id information, the target file id information and the encryption parameter appointed by the playing back endd；
4) The client side decrypts the key through the keydAnd decrypting the encrypted video file playing address to obtain a real video file playing address.
Optionally, the sending of the play address request for the target video id in step 1) further includes sending the encrypted target video id, where the encrypted target video id is generated by encrypting according to the target video id.
Optionally, the target file id information received in step 2) is an encrypted target file id.
Optionally, the encryption parameters agreed by the playing back end in the step 2) are written in the client through code obfuscation and reinforcement.
Optionally, in step 1), after the client sends a play address request for the target video id to the play back end, the processing step of the play back end includes:
s1) the playing back end generates an encryption key according to the encrypted target video id and the target file id corresponding to the target video ide；
S2) the playing back end generates an encrypted target file id according to the target file id;
s3) playing back end using encryption keyeEncrypting all parameters or part of parameters of the real video file playing address of the target file id to obtain an encrypted video file playing address;
s4) the playing back end returns the playing address of the encrypted video file and the id of the encrypted target file to the client.
Optionally, the decryption keydIs expressed as formula (1), and the encryption keyeThe generating function expression of (2) is shown in the formula;
keyd= FIDvid mod p （1）
in the formula (1), keydRepresenting a decryption key, wherein FID is an encrypted target file id, vid is an original target video id, p is an encryption parameter agreed by a client and a playing back end, and p is a prime number greater than 0;
keye = VIDfid mod p （2）
in the formula (2), keyeAnd the VID is an encrypted target video id, the fid is a target file id corresponding to the target video id, p is an encryption parameter agreed by the client and the playing back end, and p is a prime number greater than 0.
Optionally, a generating function expression of the encrypted target video id is shown in formula (3);
VID = gvid mod p （3）
in the formula (3), VID represents an encrypted target video id, VID is an original target video id, p and g are encryption parameters agreed by the client and the playing back end, where p is a prime number greater than 0, and g is an integer greater than 0 and less than p.
Optionally, a generating function expression of the encrypted target file id is shown in formula (4);
FID = gfid mod p （4）
in the formula (4), FID represents an encrypted target file id, FID is a target file id corresponding to the target video id, p and g are encryption parameters agreed by the client and the playing back end, where p is a prime number greater than 0, and g is an integer greater than 0 and less than p.
The invention also provides a video file playing address analysis and acquisition method, which comprises computer equipment and is characterized in that the computer equipment is programmed to execute the steps of the video file playing address analysis and acquisition method, or a storage medium of the computer equipment is stored with a computer program programmed to execute the video file playing address analysis and acquisition method.
The present invention also provides a computer-readable storage medium, which is characterized in that the computer-readable storage medium has stored thereon a computer program programmed to execute the aforementioned video file playing address resolution acquisition method of the present invention.
Compared with the prior art, the invention has the following advantages:
1. the client side receives the playing address of the encrypted video file returned by the playing back end, the playing back end encrypts the playing address, and the client side can request the playing of the video file only by decrypting, so that the threshold of a link thief is improved.
2. The client side of the invention generates the decryption key by encryptiondAnd the client end decrypts the key through the keydDecrypting the playing address of the encrypted video file to obtain the real playing address of the video file, wherein the encryption and decryption keys are not fixed and are based on the target video id information, the target file id information and the playing addressThe keys for playing the addresses of the files with different definitions are different when the encryption parameters agreed by the back end are generated, so that the threshold of the hotlink thief is improved.
3. The key links of encryption and decryption of the invention comprise: the method comprises an encryption algorithm, target video id information, target file id information and encryption parameters appointed by a playing back end, wherein the four links are all absent, even if the target video id information and the target file id information in the playing process are captured and the encryption algorithm is obtained, if the encryption parameters appointed by the playing back end cannot be determined, the playing address of the encrypted video file cannot be decrypted to obtain a real playing address of the video file. Moreover, the encryption parameters agreed with the playing back end can be further written in the client app through code confusion and reinforcement according to needs, and the reverse engineering can be prevented from taking the specific numerical values of the encryption parameters agreed in advance from the client app.
The invention realizes a safe video playing address analysis and acquisition mechanism through the three points, by improving the client and the playing back end, the third party simulates the request sent by the client, although the playing address can be obtained, but the back end directly using the playing addresses can refuse the request to achieve the purpose of controlling a third party to obtain the playing addresses, only authorized client ends can obtain the playing addresses under normal conditions, the threshold of obtaining the playing addresses by the third party is improved, the third party only cracks the playing control algorithm in the improvement, meanwhile, the normal client can be simulated to obtain the playing address only by taking the core parameters of the algorithm, the problem of video file stealing link can be effectively solved, the purpose of playing safety control is achieved, the loss of the stealing link to the service can be reduced, the operation cost of a video content service provider is reduced, and the use experience of a legal user is improved.
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FIG. 1 is a schematic diagram of the basic principle of the method according to the embodiment of the present invention.
Detailed Description
As shown in fig. 1, the implementation steps of the method for analyzing and acquiring the playing address of the video file in this embodiment include:
1) the client sends a play address request aiming at the target video id to the play back end;
2) the client receives the playing address of the encrypted video file and the id information of the target file returned by the playing back end;
3) the client encrypts and generates a decryption key according to the target video id information, the target file id information and the encryption parameter appointed by the playing back endd；
4) The client side decrypts the key through the keydAnd decrypting the encrypted video file playing address to obtain a real video file playing address.
In this embodiment, sending the play address request for the target video id in step 1) further includes sending the encrypted target video id, where the encrypted target video id is generated by encrypting the target video id, and the encrypted target video id is transmitted, so that the client can be prevented from forging the target video id. In addition, the original target video id can also be directly sent according to the requirement, which makes it easier for the client to forge the target video id.
In this embodiment, the target file id information received in step 2) is an encrypted target file id. In this embodiment, the encrypted target video id forms a first encryption link (realized by the client) between the client and the playing back end, the encrypted target file id forms a second encryption link (realized by the playing back end) between the client and the playing back end, and the third encryption link (realized by the client) is combined to encrypt and generate the decryption keydConstitute the generation of decryption keydThe three encryption links can improve the decryption keydSecurity against decrypting keydIs forged.
In this embodiment, the encryption parameters agreed by the playing back end in step 2) are written in the client through code obfuscation and reinforcement, so that reverse engineering can be prevented from taking specific values of the encryption parameters agreed in advance from the client app. It should be noted that code obfuscation and reinforcement of the code is a well-known means for preventing reverse engineering from obtaining secret information, and this embodiment is only an application of the above method, so the details of the implementation thereof will not be described herein.
In this embodiment, after the client in step 1) sends a play address request for the target video id to the play back end, the processing step of the play back end includes:
s1) the playing back end generates an encryption key according to the encrypted target video id and the target file id corresponding to the target video ide；
S2) the playing back end generates an encrypted target file id according to the target file id;
s3) playing back end using encryption keyeEncrypting all parameters or part of parameters of the real video file playing address of the target file id to obtain an encrypted video file playing address;
s4) the playing back end returns the playing address of the encrypted video file and the id of the encrypted target file to the client.
As a specific example of an implementation, the decryption key in this embodimentdThe generation function expression of (2) is as shown in formula (1), and the key is encryptedeThe generating function expression of (2) is shown in the formula;
keyd= FIDvid mod p （1）
in the formula (1), keydAnd representing a decryption key, wherein FID is an encrypted target file id, vid is an original target video id, p is an encryption parameter agreed by the client and the playing back end, and p is a prime number greater than 0. The value of the prime number p should be as large as possible, so that the possibility that a stealer acquires the prime number p and the integer g when analyzing the playing behavior of the client is smaller. The prime number p is a parameter suitable for mod operation, and if the encryption algorithm does not adopt mod operation, the encryption parameter agreed at the playing back end can adopt a corresponding parameter type, such as a numerical value, a character string and the like, according to the actually adopted encryption algorithm.
keye = VIDfid mod p （2）
In the formula (2), keyeRepresenting an encryption key, VID is an encrypted target video id, fid is a target file id corresponding to the target video id, and p is a client and a playing keyAnd p is a prime number greater than 0 in the encryption parameters appointed by the back end. Note that, the decryption key is described abovedGenerating function expression and encryption keyeThe generated function expression is only a specific example of an encryption algorithm, and on this basis, a person skilled in the art may also use other encryption algorithms as needed, and the encryption of the related information may also be implemented.
As an implementation specific example, a generation function expression of the encrypted target video id in this embodiment is shown in formula (3);
VID = gvid mod p （3）
in the formula (3), VID represents an encrypted target video id, VID is an original target video id, p and g are encryption parameters agreed by the client and the playing back end, where p is a prime number greater than 0, and g is an integer greater than 0 and less than p. It should be noted that the above-mentioned generating function expression of the encrypted target video id is only a specific example of an encryption algorithm, and on this basis, those skilled in the art may also implement encryption of related information according to other encryption algorithms as needed.
As a specific example of the embodiment, the generation function expression of the encrypted target file id in this embodiment is shown in formula (4);
FID = gfid mod p （4）
in the formula (4), FID represents an encrypted target file id, FID is a target file id corresponding to the target video id, p and g are encryption parameters agreed by the client and the playing back end, where p is a prime number greater than 0, and g is an integer greater than 0 and less than p. It should be noted that the above-mentioned generating function expression of the encrypted target file id is only a specific example of an encryption algorithm, and on this basis, those skilled in the art may also implement encryption of related information according to other encryption algorithms as needed.
Decryption key in the method of the embodimentdAnd encryption keyeIs actually summed with the encryption algorithm (e.g., mod operation), target video id (vid), destinationThe target file id (fid) and the prime number p and the integer g which are predetermined by the client and the playing back end are related, the links are all in a defect, and the target video id (vid) and the target file id (fid) adopt an encryption mode in the transmission process, even if the encrypted target Video Id (VID) and the encrypted target File Id (FID) in the playing process are captured, the encryption algorithm is known, if the predetermined prime number p and the integer g cannot be determined, the playing address of the encrypted video file still cannot be decrypted to obtain the real playing address of the video file. Moreover, the pre-agreed prime number p and the pre-agreed integer g are written in the app through code obfuscation and reinforcement, and the specific numerical values of the pre-agreed prime number p and the pre-agreed integer g are difficult to be taken through reverse engineering.
To sum up, the method for analyzing and obtaining the playing address of the video file in this embodiment controls the client to request the playing address, the client sends a playing address request for the target video id to the playing back end, the client receives the playing address of the encrypted video file and the id information of the target file returned by the playing back end, and encrypts and generates the decryption key according to the id information of the target video, the id information of the target file and the encryption parameter agreed by the playing back enddBy decrypting the keydAnd decrypting the encrypted video file playing address (unlocking all or key parameters in the playing address) to obtain a real video file playing address, and downloading the video file according to the real video file playing address. The third party simulates to send a play address request, and although the play address may be obtained, the third party cannot normally decrypt the play address because all or key parameters are encrypted, so that the third party cannot directly use the address to download the video. Therefore, the embodiment only allows the authorized client to normally take the playing address, so that a third party is prevented from obtaining the playing address, the problem of video file hotlinking can be effectively solved, the operation cost of a video content service provider is reduced, and the use experience of a legal user is improved.
In this embodiment, the client specifically refers to a player APP, and in addition, a video downloader APP or a downloader APP with a playing function may also be adopted as needed, and a platform installed at the client may be an operating system platform of the intelligent device or an operating system platform of a general computer.
In addition, this embodiment further provides a method for acquiring a playing address resolution of a video file, including a computer device, where the computer device is programmed to execute the steps of the method for acquiring a playing address resolution of a video file according to this embodiment, or a storage medium of the computer device stores a computer program programmed to execute the method for acquiring a playing address resolution of a video file according to this embodiment. In addition, the present embodiment further provides a computer-readable storage medium, wherein a computer program programmed to execute the video file playing address parsing and acquiring method of the present embodiment is stored on the computer-readable storage medium.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (6)
1. A method for analyzing and acquiring a video file playing address is characterized by comprising the following implementation steps:
1) the client sends a play address request aiming at the target video id to the play back end;
2) the client receives the playing address of the encrypted video file and the id information of the target file returned by the playing back end;
3) the client encrypts and generates a decryption key according to the target video id information, the target file id information and the encryption parameter appointed by the playing back endd；
4) The client side decrypts the key through the keydDecrypting the encrypted video file playing address to obtain a real video file playing address;
step 1) after a client sends a play address request aiming at a target video id to a play back end, the processing step of the play back end comprises the following steps:
s1) the playing back end generates an encryption key according to the encrypted target video id and the target file id corresponding to the target video ide；
S2) the playing back end generates an encrypted target file id according to the target file id;
s3) playing back end using encryption keyeEncrypting all parameters or part of parameters of the real video file playing address of the target file id to obtain an encrypted video file playing address;
s4) the playing back end returns the playing address of the encrypted video file and the encrypted target file id to the client;
the decryption keydIs expressed as formula (1), and the encryption keyeThe generating function expression of (2) is shown in the formula;
keyd＝FIDvid mod p (1)
in the formula (1), keydRepresenting a decryption key, wherein FID is an encrypted target file id, vid is an original target video id, p is an encryption parameter agreed by a client and a playing back end, and p is a prime number greater than 0;
keye＝VIDfid mod p (2)
in the formula (2), keyeAnd the VID is an encrypted target video id, the fid is a target file id corresponding to the target video id, p is an encryption parameter agreed by the client and the playing back end, and p is a prime number greater than 0.
2. The method for analyzing and obtaining the playing address of the video file according to claim 1, wherein the step 1) of sending the playing address request for the target video id further comprises sending the encrypted target video id, wherein the encrypted target video id is generated by encrypting the target video id, and a generating function expression of the encrypted target video id is shown in a formula (3);
VID＝gvid mod p (3)
in the formula (3), VID represents an encrypted target video id, VID is an original target video id, p and g are encryption parameters agreed by the client and the playing back end, where p is a prime number greater than 0, and g is an integer greater than 0 and less than p.
3. The method for analyzing and acquiring the playing address of the video file according to claim 1, wherein the target file id information received in the step 2) is an encrypted target file id, and a generating function expression of the encrypted target file id is shown in a formula (4);
FID＝gfid mod p (4)
in the formula (4), FID represents an encrypted target file id, FID is a target file id corresponding to the target video id, p and g are encryption parameters agreed by the client and the playing back end, where p is a prime number greater than 0, and g is an integer greater than 0 and less than p.
4. The method for parsing and obtaining the playing address of a video file according to claim 1, wherein the encryption parameters agreed with the playing back end in step 2) are written in the client through code obfuscation and reinforcement.
5. A video file playing address resolution acquisition system comprising a computer device, wherein the computer device is programmed to execute the steps of the video file playing address resolution acquisition method of any one of claims 1 to 4, or a storage medium of the computer device has stored thereon a computer program programmed to execute the video file playing address resolution acquisition method of any one of claims 1 to 4.
6. A computer-readable storage medium having stored thereon a computer program programmed to execute the method for parsing and obtaining a playing address of a video file according to any one of claims 1 to 4.
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