CN103065068B - A kind of encryption method of imprinting file and device - Google Patents

Abstract

The present invention is applicable to electronic equipment engraving data security fields, provides a kind of encryption method and device of imprinting file.Described encryption method comprises: the KSV sequence number being obtained electronic equipment by twin wire universal serial bus I2C; The encryption key being used for encryption burning file is generated according to the KSV sequence number obtained; Obtain the information that electronic equipment exports, and adopt the information that described in the encryption keys of generation, electronic equipment exports, to obtain the imprinting file encrypted.This invention ensures that an electronic equipment can only play the file of this electronic equipment imprinting, avoid the dispute over copyright caused because of PVR file propagation, better protect electronic equipment manufacturer, add the international competitiveness of electronic equipment manufacturer.

Description

Encryption method and device for recording files

technical field

The invention belongs to the field of recording data security of electronic equipment, and in particular relates to an encryption method and device for recording files.

Background technique

With the popularization of digital TV at home and abroad, the function of personal video recorder (PVR) as a standard configuration function of digital TV has also entered thousands of households in foreign countries.

However, if the video recorded in one electronic device (such as TV) can also be played in other electronic devices, it will involve copyright infringement. The general practice in the existing electronic device (such as TV) software is to convert The file format generates a special format according to the requirements of different electronic equipment manufacturers, so that the PVR files of different electronic equipment manufacturers are not compatible with each other and cannot be played with each other.

However, the existing methods still cannot solve the following problem: for the PVR files burned by the electronic equipment produced by the same electronic equipment manufacturer, other electronic equipment produced by the same electronic equipment manufacturer can still play them. For example, suppose Li buys a TV produced by manufacturer A, and Xia also buys a TV of the same model, then the video files recorded by Li through the PVR of the TV purchased by Li can also be played on Xia’s TV. In this way, with the continuous increase in orders from overseas markets, the chances of encountering such situations are also increasing, thus increasing the chances of copyright infringement.

Contents of the invention

The embodiment of the present invention provides an encryption method and device for recording files, aiming to solve the problem that the PVR files recorded by two electronic devices of the same model can be played mutually, thereby increasing the probability of copyright infringement.

The embodiment of the present invention is achieved like this, a kind of encryption method of burning file, described method comprises the following steps:

Obtain the KSV serial number of the electronic device through the two-wire serial bus I2C;

Generate the encryption key used to encrypt the burning file according to the obtained KSV serial number;

The information output by the electronic device is obtained, and the generated encryption key is used to encrypt the information output by the electronic device to obtain an encrypted recording file.

Another object of the embodiments of the present invention is to provide an encryption device for burning files, the encryption device comprising:

I2C bus, used to obtain the KSV serial number of the electronic device through the two-wire serial bus I2C;

An encryption key generation unit, used to generate an encryption key for encrypting and recording files according to the acquired KSV serial number;

The encryption unit is used to obtain the information output by the electronic device, and encrypt the information output by the electronic device by using the generated encryption key to obtain an encrypted recording file.

In the embodiment of the present invention, since the KSV serial number stored in each electronic device is different, the encryption key generated by using the KSV serial number stored in the electronic device is also different, so as to ensure that the recording files obtained in each electronic device They are also different, that is, ensuring that an electronic device can only play the files recorded by the electronic device, avoiding copyright disputes caused by the spread of PVR files, better protecting electronic device manufacturers, and increasing international competition among electronic device manufacturers force.

Description of drawings

Fig. 1 is the flowchart of the encryption method of a kind of recording file that the first embodiment of the present invention provides;

Fig. 2 is a structural diagram of an encryption device for burning files provided in the second embodiment of the present invention;

Fig. 3 is a structural diagram of another encryption device for burning files provided by the second embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the embodiment of the present invention, the KSV serial number stored in the electronic device is obtained, an encryption key for encrypting the recording file is generated according to the KSV serial number, and the generated encryption key is used to encrypt the information output by the electronic device, thereby obtaining the encryption key of the electronic device. recorded files.

In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.

Embodiment one:

Fig. 1 has shown the flow chart of a kind of encryption method of recording file that the first embodiment of the present invention provides, and details are as follows:

Step S11, obtaining the KSV serial number of the electronic device through the two-wire serial bus I2C.

In this step, the KSV serial number (video encryption key) is pre-stored in an electronic device equipped with a High Definition Multimedia Interface (HDMI) or a Digital Video Interface (DVI). In order to ensure that the high-definition signals transmitted by HDMI or DVI will not be illegally recorded, High-bandwidth Digital Content Protection (HDCP) technology has emerged. The HDCP technical specification is led by Intel. When users make illegal copies, this technology will interfere and reduce the quality of the copied images, thereby protecting the content. Each HDCP device will have a unique KSV serial number, and the cryptographic processing units at the sending end and the receiving end will check each other's KSV value to ensure that the connection is legal.

Electronic equipment manufacturers purchase a unique KSV serial number for each electronic equipment (such as TV), and then burn the KSV serial number into the FLASH or E2PROM of the motherboard of the electronic equipment. In step S11, the KSV serial number burned into the FLASH or E2PROM of the main board of the electronic device is read out through a two-wire serial bus (Inter-Integrated Circuit, I2C).

Further, save the read KSV serial number, such as saving in the array HashKey[] of the TV set. Among them, the length of KSV is 289 bytes.

Step S12, generating an encryption key for encrypting the recording file according to the acquired KSV serial number.

The burning file of this step is also called a PVR file.

Wherein, the step of generating the encryption key for encrypting the recording file according to the obtained KSV serial number specifically includes: generating an 8-byte encryption key for encrypting the recording file from the 289-byte KSV serial number. Among them, the first 4 bytes of the encryption key used to encrypt the burning file are equal to the square sum of the value of the first 145 bytes of the KSV serial number; the last 4 bytes of the encryption key used to encrypt the burning file are equal to KSV The sum of the squares of the values of the last 144 bytes of the serial number.

In this step, generate an 8-byte (64-bit) key from the 289-byte KSV serial number stored in the HashKey[] array, assuming the first 4 bytes (32 bits) of the key is Key_1, then the Key_1 is equal to the square of HashKey[0] plus the square of HashKey[1] in the HashKey[] array, until the sum of the square of HashKey[144], the last 4 bytes of the key (32 bits ) is Key_2, and this Key_2 is equal to the square of HashKey[145] of the HashKey[] array plus the square of HashKey[146], which is obtained by adding to the square of HashKey[288]. Since the KSV serial number purchased by each electronic device is unique, the 64-bit encryption key used to encrypt and burn files generated by each electronic device based on its own KSV serial number is unique. Among them, the encryption key generation code used to encrypt the burning file is as follows:

In step S13, the information output by the electronic device is obtained, and the generated encryption key is used to encrypt the information output by the electronic device, so as to obtain an encrypted recording file.

In this step, the file information output by the electronic device that the user needs to burn is obtained. For example, when the user uses the PVR of the digital TV to burn, the signal transmitted to the digital TV is converted into corresponding digital information through the decoding module of the digital TV. , and then use the generated encryption key to encrypt the converted digital information.

Wherein, the step of obtaining the information output by the electronic device, and using the generated encryption key to encrypt the information output by the electronic device, so as to obtain the encrypted recording file specifically includes: obtaining the information output by the electronic device; The n-th 4-byte information output by encryption of bytes, and the (n+1)-th 4-byte information encrypted by the last 4 bytes of the encryption key; where n is an odd number , n is equal to 1, 3, 5, 7,...,. Specifically, the acquired information output by the electronic device is stored in the buffer array, each buffer data occupies 4 bytes (32 bits), and then every two buffer data are encrypted, and the first The buffer data and the first 4 bytes of the encryption key (Key_1) are mathematically XORed to obtain the encrypted data, and then the second buffer data is XORed with the last 4 bytes of the encryption key (Key_2) get encrypted data.

Preferably, after the step of obtaining the information output by the electronic device, and using the generated encryption key to encrypt the information output by the electronic device to obtain the encrypted recording file, the following steps are further included: converting the generated recording file through the I2C bus stored in an external storage medium. In this step, the encrypted burning file is stored in an external storage medium (such as a U disk or a mobile hard disk, etc.) through the I2C bus.

In the embodiment of the present invention, the KSV serial number stored in the electronic device is obtained, an encryption key used to encrypt the recording file is generated according to the KSV serial number, and the generated encryption key is encrypted to the information output by the electronic device, thereby obtaining the electronic device Encrypted burn files. Since the KSV serial number stored in each electronic device is different, the encryption key generated using the KSV serial number stored in the electronic device is also different, thus ensuring that the burning files obtained in each electronic device are also different. That is to ensure that an electronic device can only play the files recorded by the electronic device, avoid copyright disputes caused by the spread of PVR files, better protect electronic device manufacturers, and increase the international competitiveness of electronic device manufacturers.

The following is the process of electronic equipment decrypting and playing the PVR file generated by the electronic equipment: (1) First, when the user plays the PVR recording file, the electronic equipment is stored in the external storage medium (such as U disk or mobile hard disk, etc.) through the I2C bus. The PVR file reads out the corresponding digital information and saves it in the buffer array, each buffer data occupies 4 bytes (32 bits); (2) Then decrypts every two buffer data, the first buffer data and Key_1 performs mathematical XOR operation to obtain decrypted data, and the second buffer data and Key_2 perform XOR operation to obtain decrypted data; (3) After restoring the encrypted file to ordinary digital data, the video decoding module of the electronic device converts These decrypted data are transmitted to the video player decoded by the main chip for playback.

Embodiment two:

FIG. 2 shows the structure of an encryption device for burning files provided by the second embodiment of the present invention. For convenience of description, only the parts related to the embodiment of the present invention are shown.

The encryption device for recording files can be used for various information processing terminals connected to servers through wired or wireless networks, such as televisions, computers, notebook computers, etc., and can be software units, hardware units or software units running in these information processing terminals. The unit combined with hardware can also be integrated into these information processing terminals as an independent pendant or run in the application systems of these information processing terminals.

The encryption device for burning files includes: an I2C bus 21 , an encryption key generation unit 22 , and an encryption unit 23 . in:

The I2C bus 21 is used to obtain the KSV serial number of the electronic device through the two-wire serial bus I2C.

In this embodiment, the electronic equipment manufacturer purchases a unique KSV serial number for each electronic equipment (such as a TV), and then burns the KSV serial number into the FLASH or E2PROM of the motherboard of the electronic equipment. Then read out the KSV serial number burned into the FLASH or E2PROM of the main board of the electronic device through the I2C bus. Further, save the read KSV serial number, such as saving in the array HashKey[] of the TV set. Among them, the length of KSV is 289 bytes.

Preferably, the KSV serial number is pre-stored in the electronic device, and each KSV serial number uniquely corresponds to one electronic device.

The encryption key generating unit 22 is configured to generate an encryption key for encrypting the recording file according to the acquired KSV serial number.

Wherein, the step of generating the encryption key by the encryption key generation unit 22 is specifically:

The 289-byte KSV serial number is used to generate an 8-byte encryption key for encrypting the recording file; wherein, the first 4 bytes of the encryption key for encrypting the recording file are equal to the first 4 bytes of the KSV serial number The sum of the squares of the value of 145 bytes; the last 4 bytes of the encryption key used to encrypt the burning file is equal to the sum of the squares of the value of the last 144 bytes of the KSV serial number.

In this embodiment, an 8-byte (64-bit) key is generated from the 289-byte KSV serial number stored in the HashKey[] array.

The encryption unit 23 is configured to obtain the information output by the electronic device, and use the generated encryption key to encrypt the information output by the electronic device, so as to obtain an encrypted recording file.

In this embodiment, the obtained information output by the electronic device is not encrypted, for example, the digital information obtained by decoding the digital TV signal output by the digital TV is obtained.

In the embodiment of the present invention, since the KSV serial number stored in each electronic device is different, the encryption key generated using the KSV serial number stored in the electronic device is also different, so as to ensure the recording The files are also different, that is, to ensure that an electronic device can only play the files recorded by the electronic device, avoiding copyright disputes caused by the spread of PVR files, better protecting electronic device manufacturers, and increasing the international reputation of electronic device manufacturers. Competitiveness.

Fig. 3 shows the structural diagram of another kind of encryption device for recording files provided by the embodiment of the present invention, as a preferred embodiment of the present invention, the encryption unit 23 of the encryption device for recording files includes:

The recording information obtaining module 231 is configured to obtain information output by the electronic device.

Burning information encryption module 232, used for adopting the first 4 bytes of the encryption key to encrypt the information of the nth 4 bytes of output, and adopting the last 4 bytes of the encryption key to encrypt the output of the (n+1 ) times of 4-byte information; wherein, n is an odd number, and n is equal to 1, 3, 5, 7, ....

In this embodiment, the acquired information output by the electronic device is stored in the buffer array, and each buffer data occupies 4 bytes (32 bits), and then the burning information encryption module 232 is used to encrypt every two buffer data, Perform a mathematical XOR operation on the first buffer data and the first 4 bytes of the encryption key (Key_1) to obtain encrypted data, and then combine the second buffer data with the last 4 bytes of the encryption key (Key_2) Perform XOR operation to get encrypted data.

As a preferred embodiment, the I2C bus 21 is also used for:

Store the generated burning file to an external storage medium.

In this embodiment, the encrypted burning file is stored in an external storage medium (such as a U disk or a mobile hard disk) through the I2C bus, so that the burning file can be saved.

In the embodiment of the present invention, the KSV serial number stored in the electronic device is obtained, an encryption key used to encrypt the recording file is generated according to the KSV serial number, and the generated encryption key is encrypted to the information output by the electronic device, thereby obtaining the electronic device Encrypted burn files. Since the KSV serial number stored in each electronic device is different, the encryption key generated using the KSV serial number stored in the electronic device is also different, thus ensuring that the burning files obtained in each electronic device are also different. That is to ensure that an electronic device can only play the files recorded by the electronic device, avoid copyright disputes caused by the spread of PVR files, better protect electronic device manufacturers, and increase the international competitiveness of electronic device manufacturers.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (8)

1. an encryption method for imprinting file, is characterized in that, described method comprises the steps:

The KSV sequence number of electronic equipment is obtained by twin wire universal serial bus I2C;

The encryption key being used for encryption burning file is generated according to the KSV sequence number obtained;

Obtain the information that electronic equipment exports, and adopt the information that described in the encryption keys of generation, electronic equipment exports, to obtain the imprinting file encrypted;

The step that the described KSV sequence number according to obtaining generates the encryption key being used for encryption burning file specifically comprises:

The KSV sequence number of 289 bytes is generated the encryption key being used for encryption burning file of 8 bytes;

Wherein, front 4 bytes of the described encryption key for encryption burning file equal the quadratic sum of the value of front 145 bytes of KSV sequence number; Rear 4 bytes of the described encryption key for encryption burning file equal the quadratic sum of the value of rear 144 bytes of KSV sequence number.

2. the method for claim 1, is characterized in that, described KSV sequence number prestores in the electronic device, the unique corresponding electronic equipment of each KSV sequence number.

3. the method for claim 1, is characterized in that, the information that described acquisition electronic equipment exports, and adopts the information that described in the encryption keys of generation, electronic equipment exports, and specifically comprises with the step obtaining the imprinting file encrypted:

Obtain the information that electronic equipment exports;

The information of 4 bytes of n-th time adopting front 4 bytes encryption of encryption key to export, the information of 4 bytes that (n+1) that adopt rear 4 bytes encryption of encryption key to export is secondary; Wherein, n is odd number.

4. the method as described in any one of claims 1 to 3, it is characterized in that, in the information that described acquisition electronic equipment exports, and adopt the information that described in the encryption keys of generation, electronic equipment exports, with obtain encrypt imprinting file step after, comprise the steps: further

By I2C bus, the imprinting file generated is stored in exterior storage medium.

5. an encryption device for imprinting file, is characterized in that, described encryption device comprises:

I2C bus, for obtaining the KSV sequence number of electronic equipment by twin wire universal serial bus I2C;

Encrypting key generating unit, for generating the encryption key being used for encryption burning file according to the KSV sequence number obtained;

Ciphering unit, for obtaining the information that electronic equipment exports, and adopts the information that described in the encryption keys of generation, electronic equipment exports, to obtain the imprinting file encrypted;

The step that described encrypting key generating unit generates encryption key is specially:

The KSV sequence number of 289 bytes is generated the encryption key being used for encryption burning file of 8 bytes;

Wherein, front 4 bytes of the described encryption key for encryption burning file equal the quadratic sum of the value of front 145 bytes of KSV sequence number; Rear 4 bytes of the described encryption key for encryption burning file equal the quadratic sum of the value of rear 144 bytes of KSV sequence number.

6. encryption device as claimed in claim 5, it is characterized in that, described KSV sequence number prestores in the electronic device, the unique corresponding electronic equipment of each KSV sequence number.

7. encryption device as claimed in claim 5, it is characterized in that, described ciphering unit comprises:

Record information acquisition module, for obtaining the information that electronic equipment exports;

Record information encrypting module, the information of 4 bytes of n-th time exported for adopting front 4 bytes encryption of encryption key, the information of 4 bytes that (n+1) that adopt rear 4 bytes encryption of encryption key to export is secondary; Wherein, n is odd number.

8. the encryption device as described in any one of claim 5 to 7, is characterized in that, described I2C bus also for:

The imprinting file generated is stored in exterior storage medium.