RU2674330C2 - Recording performance and the recorded video data authenticity checking implementation method - Google Patents

Abstract

FIELD: video equipment.

SUBSTANCE: invention relates to the video data recording methods for the recorded video data subsequent authenticity verification. Generating and issuing to the user containing the simple action verification task, which user must perform during the video data recording, fixing the user ID on the server, the issued verification task and the verification task issuing time. During the video recording making, the user performs a verification task, and, that the user does not have the opportunity to know the verification task until the moment of its reception, ensures that the video record was made no earlier than the time that verification task was issued. To confirm the video recording time determining accuracy, upon request issuing the one-time code to the user, which is added to the video data, and calculating the hash from the video data with the added code, sending the hash to the server to be saved.

EFFECT: technical result is the ability to unambiguously or with a high degree of reliability confirm the video record authenticity.

3 cl

Description

Technical field

The invention relates to methods for recording video data using cameras built into personal mobile devices (smartphones, tablets, personal computers, laptops) for subsequent verification of the authenticity of recorded video data and can be used to verify the authenticity of user-recorded video data and subsequently provided as evidence, for example , when considering an insured event by insurance companies.

State of the art

The verification of the authenticity of the recorded video data means the receipt of an unambiguous or with a high degree of reliability confirmation that the provided video data was recorded by the user no earlier than a fixed point in time, and the recording was made by the user with a real camera built into a personal mobile device (smartphone, tablet, personal computer, laptop )

During authentication, the situation where the recording of video data is made by the user in advance, i.e. to a known fixed point in time.

During authentication, the situation should be excluded when the user records video data not from the real one, but from a camera emulated on a personal mobile device that provides a video made in advance by the user.

The well-known "Method of identifying the authenticity of a controlled object" (RF patent 2132569, prior, from 13.11.98, G06K 9/00), which consists in the fact that information about the object is generated in digital form, including information about the type of object, manufacturer, production date , the individual number of the object, text information in the form of accompanying documents to the object, sign this information with an electronic digital signature (EDS) of the marker, convert it into a bar code and put it on the object or on a label attached to the object. When reading information, the barcode is converted back to digital form, an electronic digital signature is isolated from it, and then the digital signature is authenticated. If the digital signature is identified as genuine, then the object is authenticated by comparing the read information about the object with the database of genuine objects. If this information matches, then the object is identified as genuine.

The well-known "Method of Confirming the Authenticity of Information" (RF patent 2165643, prior. 19.04.2000, G06K 9/00), in which text information or part of text information printed on paper is used as the protected object. Text information is converted into digital form, signed by the EDS of the marker and the public key of the marker is added to verify the EDS, and then they are converted into a bar code, which is applied to a paper medium with text information. To verify the authenticity of text information, the reverse conversion of the barcode is performed, the authenticity of the digital signature of the marker is verified using the public key located in the same barcode. If the digital signature is genuine, then a conclusion is drawn about the authenticity of the text information.

The invention of the same authors is known, described in RF patent 2172015 "Method for identifying the authenticity of a controlled object" (prior. 01.03.2000, G06K 9/00), which is the closest analogue to the claimed technical solution. The method according to RF patent 2172015 consists in the fact that excisable goods are used as protected objects. In this case, information about the consumer properties of the goods, manufacturer's parameters and production characteristics are used as information about the protected object. The manufacturer’s code is the region code, manufacturer’s code, application number for the manufacture of a serial batch of goods. As consumer properties of the object, parameters are used that are controlled visually, by touch, by weight, by color and smell. As production characteristics, the code of the marking organization, the code of the supplier, the code of the manufacturer, the type of object, the date of manufacture of the goods are used.

The above types of information about the object are converted into digital form, sign it with the EDS of the marker, add the public key of the marker for checking the authenticity of the EDS, and then they are converted into a bar code that is applied on paper, which is applied to the object or to the label attached on the object.

To verify the authenticity of the object, the reverse conversion of the barcode is carried out, checking the authenticity of the digital signature of the marker using the public key located in the barcode. If the digital signature is genuine, then a conclusion is drawn about the authenticity of the information, the authenticity of the information is judged on the authenticity of the protected object, and the organoleptic (taste, color, aroma, appearance) indicators of the object are compared with the information read from the bar code. And information about the marker, manufacturer and production characteristics of the object, read from the bar code, is compared with the information in the database of genuine objects.

These methods cannot be explicitly applied to solve the problem that the present invention is directed to, however, they describe a general approach for verifying the authenticity of objects. This approach can be used to verify the authenticity of user-recorded video data if we consider as an object not a material object (product), but digital, namely, user-recorded video data.

A common disadvantage of these methods in relation to solving the problem of confirming the authenticity of user-recorded video data are:

1. EDS for video recording is formed on the user's personal mobile device, and therefore, a signature can be generated in relation to any video created in advance, which will not allow to establish a lower time limit for the video recording, and therefore, it is impossible to verify the authenticity of the video by the time criterion.

2. An emulated camera can be launched by the user on a personal mobile device, through which video data pre-recorded by the user can be issued, which will be signed with digital signature, which will subsequently lead to erroneous authentication of the non-authentic video recording.

The proposed method for recording and authenticating recorded video data is devoid of these disadvantages.

Disclosure of invention

The objective of the invention is to provide a method for recording video using cameras built into personal mobile devices (smartphones, tablets, personal computers, laptops) for subsequent verification of the authenticity of recorded video data and can be used to verify the authenticity of user-recorded video data and subsequently provided as evidence, for example, when considering an insured event by an insurance company.

The problem is solved in that in the method for recording and authenticating recorded video data, the following steps are distinguished:

1 - the stage of generating and issuing the verification task to the user, during which the user accesses the server, where the user is authenticated on the server, issuing the verification task to the user, containing a simple action that the user should perform when recording video data, fixing the user ID on the server, the issued verification task and the time of issue of the verification task;

2 - the stage of video recording by the user, during which the user generates video data using a camera built into a personal mobile device, performing a simple action issued to the user as a verification task;

3 - verification step of the authenticity of the recorded video data, during which the user recorded the video data visually for continuity to exclude video editing and the presence on the video of a simple action issued to the user as a verification task.

The server provides network access. The user is authenticated on the server, the verification task is issued, the user ID, the verification task issued and the time of the verification task are issued, and the information recorded on the server is available only for reading and adding, but not for deleting and changing, which guarantees its invariability, and, therefore, the possibility of verifying the authenticity of user-recorded video data on the basis of a visual assessment of their continuity to exclude video editing and availability in deozapisi simple action issued by the user as a check reference. The fixed time is determined on the basis of the local time of the server at the time of the user’s request, which cannot be influenced by the user, which subsequently allows the video to be authenticated by the time criterion.

In addition, in modern personal mobile devices, as a rule, various sensors are integrated, for example, an accelerometer, gyroscope, magnetometer, GPS. To increase the reliability of the verification of the authenticity of the recorded video data in synchronization with the video, measurements are recorded from sensors built into the personal mobile device, and when authenticating the recorded video data, the user recorded video data is visually examined for the correspondence of the video data to the motion path of the personal mobile device in the process of recording video data, while the trajectory of the personal mobile device in the process of recording video data Restores the based on the recorded synchronously with the video changes with sensors in the private mobile device.

In addition, to increase the reliability of authentication by the criterion of time, a one-time code is issued to the user upon request, which is added to the recorded video data, the hash from the video data with the one-time code added is calculated, the received hash is sent to the server, the code issuing time is saved on the server, user ID to which a one-time code was issued, the code issued, as well as the received hash, while the data stored on the server is used in authenticating the video made by the user, adding they add the stored one-time code to the user-provided video data, determine the hash from the video data with the added code, compare the received hash with the one stored on the server, if it is consistent, they conclude that the provided video data was recorded by the user not earlier than the time stored on the server and not changed after sending to the calculated hash server. Adding a one-time code can be done in various ways, for example, adding a one-time code by concatenation to the end of the video data or cycling the one-time code onto the video data by adding modulo 2 (XOR operation) before calculating the hash of the data obtained as a result of adding the one-time code. To calculate the hash, any of the well-known algorithms can be used, for example, GOST R 31.11 -94 or MD5 (https://ru.wikipedia.org/wiki/MD5).

The claimed invention provides an unambiguous or with a high degree of reliability confirmation that the provided video data was recorded by the user no earlier than a fixed point in time, and the recording was made by the user with a real camera built into a personal mobile device (smartphone, tablet, personal computer, laptop).

During authentication, the situation when the recording of video data is made by the user in advance, i.e. to a known fixed point in time, as well as the situation when the user records video data not from the real one, but from a camera emulated on a personal mobile device that provides a video made in advance by the user.

The implementation of the invention

As an example implementation of the invention, consider the implementation of video recording by a client of an insurance company in order to provide video recordings as evidence in the event of an insured event. Significant for the case under consideration is the unambiguous or with a high degree of reliability confirmation that the provided video data was recorded by the user no earlier than a fixed point in time, and the recording was made by the user with a real camera built into a personal mobile device (smartphone, tablet, personal computer, laptop), to prevent the possibility of issuing video data recorded by the user in advance before the insured event.

To implement the invention perform the following sequence of actions:

1. At the stage of formation and delivery of the verification task (1), the user from his personal mobile device accesses the server via the Internet, where he passes identification, after which the user is sent a one-time code and a verification task containing a simple action that the user must perform when recording video data. On the server, the user identifier, the one-time code issued and the verification task, as well as the time of issue, are recorded. Examples of verification tasks include the following simple steps:

close-up show the left / right front / rear headlight of a car / object;

describe the circle / triangle / square by the camera;

show thumb in front of camera during shooting;

print on paper the specified text / code / QR code / barcode and place it temporarily in front of the subject;

Describe a given letter / number in the air with a camera;

etc.

As a one-time code, any binary sequence generated randomly or pseudo-randomly on the server can be used.

2. At the stage of video recording (2), the user creates a video using a camera built into a personal mobile device, with a simple action issued to the user as a verification task. At the same time, when performing a video recording, the user performs a synchronous recording of measurements from the sensors (accelerometer and magnetometer) integrated into the personal mobile device synchronously with the video.

3. After completion of the video recording, the one-time code obtained in step (1) is added to the recorded video data. Adding a one-time code can be done in various ways, for example, adding a one-time code by concatenating to the end of a video data file or cycling a one-time code onto a video data file by adding modulo 2 (XOR operation) before calculating the hash of the data obtained as a result of adding a one-time code. To calculate the hash, any of the well-known algorithms can be used, for example, GOST R 31.11-94 or MD5 (https://ru.wikipedia.org/wiki/MD5). The resulting hash is sent to the server, where it is stored. At the same time, the recorded video data is stored by the user on a personal mobile device and presented for authentication only in the event of an insured event.

4. When an insured event occurs, the user presents the recorded video data to the insurance company for the verification phase of the recorded video data (3), during which the following actions are performed:

4.1. The stored one-time code is added to the user-provided video data in the same manner as in clause 3, the hash from the video data is added with the one-time code added, the received hash is compared with that stored on the server, if it is consistent, it is concluded that the provided video data was not recorded by the user time previously saved on the server and not changed after the moment of sending the calculated hash to the server.

4.2. A visual review of the user-provided video data is performed for continuity to exclude video editing and the presence on the video of a simple action issued to the user as a verification task. If there is a visually continuous record containing a simple action issued to the user as a verification task, it is concluded that the recording was made by the user no earlier than the time the verification task was issued. At the same time, the moment the task was issued is fixed on the server and is not available for modification by the user, and the fixed time is determined based on the local time of the server at the time of the user's request.

4.3. The trajectory of the user's personal mobile device is restored during the video recording, then the restored trajectory is compared with the recorded video data. With a visual coincidence of the video recording and the restored motion path of the personal mobile device, a conclusion is made about the unambiguous or with a high degree of reliability confirmation that the recording was made from a real camera built into a personal mobile device, and not emulated.

, а ось OY с совпадала со склонением вектора магнитного поля планеты

.We present a mathematical model for determining the position in space based on a 3x axial accelerometer and 3x axial magnetometer under the condition of movements with slight accelerations. To determine the position of the body in space, we introduce the global three-dimensional Cartesian coordinate system OXYZ, so that the OZ axis coincides in the direction with the direction of the lines of force of the gravitational field

, and the OY axis coincides with the declination of the planet’s magnetic field vector

.

To describe the position of the sensor in the global coordinate system (HSC), we introduce a local coordinate system (LSC), the axes of which will coincide with the corresponding axes of the acceleration and magnetic field sensors. Then the position of the LSC (sensors) in the HSC can be described by four vectors:

- вектор смещения начала координат ЛСК относительно начала координат ГСК;

- the vector of displacement of the coordinate origin of the LSC relative to the coordinate origin of the HSC;

,

,

- направляющие векторы ортонормированного базиса ЛСК выраженные через направляющие векторы ортонормированного базиса ГСК.

,

,

- the direction vectors of the orthonormal basis of LSC expressed through the direction vectors of the orthonormal basis of HSC.

Such a description gives complete information about the orientation of the LSC in the HSC in coordinate form.

,

,

в ГСК.The problem of determining the angular orientation is reduced to finding the coordinates of the vectors

,

,

in GSK.

Due to the fact that the gravitational field is more stable than magnetic, we take the acceleration sensor as a basis. The readings of the acceleration sensor represent the coordinates of the acceleration vector of gravity, laid out along the axes of the LSC:

есть ничто иное как вектор

, т.е. Задающий вектор оси OZ ГСК, выраженный через направляющие векторы ЛСК:Normalized vector

there is nothing but a vector

, i.e. The OZ GSK axis axis vector expressed in terms of the LSK guide vectors:

The readings of the magnetic field sensor are the coordinates of the magnetic field vector, laid out along the axes of the LSC:

в общем случае может быть не параллелен вектору

, следовательно, нужно получить его нормальную компоненту:Vector

in the general case, may not be parallel to the vector

therefore, you need to get its normal component:

есть ничто иное как вектор

, т.е. Задающий вектор оси OY ГСК, выраженный через направляющие векторы ЛСК:Normalized vector

there is nothing but a vector

, i.e. The master axis vector OY HSC, expressed through the guide vectors LSC:

The defining axis vector ОХ ГСК, expressed in terms of the directing vectors of the LSC, is found using the vector product:

,

,

затем транспонируем ее и разложим на векторы (также по строкам):We compose the row matrix, which are represented by vectors

,

,

then we transpose it and decompose it into vectors (also along the lines):

Thus vectors:

determine the axis of the LSC in the HSC, in other words, determine the orientation of the LSC in the HSC.

в ГСК:Express the vector

at GSK:

заданы в квантах АЦП датчика ускорения, для дальнейших вычислений переведем их в систему СИ и запишем вектор мгновенных ускорений:Vector Counts

are given in the quanta of the ADC of the acceleration sensor, for further calculations we will transfer them to the SI system and write the vector of instantaneous accelerations:

,

,

where range is the range of the analog-to-digital converter of the sensor, and N is the division price.

To account for the gravitational field, the vertical component should be reduced by the value of the acceleration of gravity:

Let's move from acceleration to speed:

Let's move from speed to coordinates:

Thus, the proposed mathematical model makes it possible to determine from the readings of the sensors the orientation of the sensor relative to the global coordinate system associated with the physical features of the planet, to determine by linear integration the linear displacement of the sensor in the global coordinate system, and therefore, to restore the trajectory of the user's personal mobile device from the recorded sequence of measurements .

Claims (11)

1. The method of recording and authentication of recorded video data, carried out using cameras built into personal mobile devices, which contains the step of generating and issuing the verification task to the user (1), including identification of the user on the server, issuing to the user the verification task containing the action that the user must perform when recording video data, fixing the user ID on the server, the verification task issued and the time the verification task was issued, a video recording step by a user (2), including generating video data by a user using a camera integrated in a personal mobile device, performing an action issued to the user as a verification task, the verification step of the authenticity of the recorded video data (3), including visual viewing of the video data recorded by the user for continuity to exclude video editing and the presence on the video of an action issued to the user as a verification task, wherein the user identification, the issuance of the verification task, the fixation of the user ID, the issued verification task and the time of issuing the verification task is carried out on a server accessible to the user via the Internet, at the user's request, while the fixed time is determined based on the local time of the server at the time of receipt of the user request, at the same time, the information recorded on the server is available only for reading and adding, but is not accessible for deletion and modification, which guarantees its invariability, and therefore, providing the ability to verify the authenticity of the recorded video data on the basis of a visual assessment of their continuity to exclude video editing and the presence of video actions issued to the user as a verification task. 2. A method for recording and verifying the authenticity of recorded video data according to claim 1, carried out using cameras and sensors integrated in personal mobile devices, characterized in that when the user performs video recording, measurements are recorded synchronously with the video from sensors built into the personal mobile device , and when performing verification of the authenticity of the recorded video data, a visual viewing of the recorded video data by the user is made for compliance of the video data with the motion path personal mobile device in the process of recording video data, in this case, the motion path of the personal mobile device in the process of recording video data is restored based on the changes recorded simultaneously with the video from sensors built into the personal mobile device. 3. A method for recording and verifying the authenticity of recorded video data according to claim 1, characterized in that the user is given a one-time code upon request to the server, which is added to the recorded video data, the hash from the video data with the one-time code added is calculated, the resulting hash is sent to the server, the server stores the time of issuing the code, the identifier of the user to whom the one-time code is issued, the one-time code issued, as well as the calculated hash, at the same time, the data stored on the server is used to verify the authenticity of the video made by the user, the saved one-time code is added to the user-provided video data, the hash from the video data is added with the one-time code added, the calculated hash is compared with the one stored on the server, if so, it is concluded that the provided the video data was recorded by the user no earlier than the time saved on the server and was not changed after the moment of sending the calculated hash to the server.