WO2016034035A1

WO2016034035A1 - Recording encryption method and device and computer storage medium

Info

Publication number: WO2016034035A1
Application number: PCT/CN2015/086843
Authority: WO
Inventors: 杨善武; 张圣杰; 马妍
Original assignee: 努比亚技术有限公司
Priority date: 2014-09-05
Filing date: 2015-08-13
Publication date: 2016-03-10
Also published as: CN104243166A

Abstract

Disclosed are a recording encryption method and device and a computer storage medium, wherein the recording encryption method comprises: in a recording process, collecting audio data; splitting the audio data into a plurality of audio data units with a pre-set length in bytes; and using a data encryption key to encrypt each of the audio data units to generate an encrypted file.

Description

Recording encryption method and device and computer storage medium

Technical field

The present invention relates to the field of communications technologies, and in particular, to a recording encryption method and apparatus, and a computer storage medium.

Background technique

During normal conversations or voice calls, users sometimes need to record conversations or conversations for later review or use as evidence. In order to prevent the leakage of recorded data and ensure data security, it is necessary to encrypt the recorded data. The existing recording encryption method usually relies on a voice encryption chip to implement encryption of recorded data by means of hardware encryption. This encryption method is limited by the hardware configuration of the terminal, and cannot be implemented for a terminal without an encryption chip. In the prior art, there is also a soft encryption method, which usually encrypts the generated audio file to generate an encrypted file after the recording ends, but the encryption method is low in security and easy to be cracked, and is easily recognized as an encrypted file. The attack is cracked, so the security of the recorded data and user privacy are not well protected.

Summary of the invention

The main purpose of the embodiments of the present invention is to provide a recording encryption method and device, and a computer storage medium, aiming at improving the security of recorded data and protecting user privacy.

To achieve the above objective, an embodiment of the present invention provides a recording encryption method, including:

Acquiring audio data during recording;

Splitting the audio data into audio data units of a plurality of preset byte lengths;

Each of the audio data units is encrypted using a data encryption key to generate an encrypted file.

Optionally, after the encrypting each of the audio data units by using a data encryption key to generate an encrypted file, the method further includes:

After the recording is completed, the data encryption key is encrypted using the encryption key of the data encryption key, and the encrypted information is stored in the encrypted file.

After the recording is completed, the set password is obtained, the password is encrypted by the password encryption key, and the encrypted information is stored in the encrypted file.

Optionally, the obtaining the set password further includes: acquiring the set password prompt information password prompt information and storing the encrypted file.

Optionally, the encrypting each of the audio data units by using a data encryption key to generate an encrypted file further includes: after the recording ends, disguising the format of the encrypted file as a general audio file format.

Optionally, the audio data is audio data in a PCM pulse code modulation format.

Optionally, the preset byte length is 16-256 bytes in length.

The embodiment of the invention further provides a recording encryption device, which comprises an acquisition module, a split module and an encryption module, wherein:

An acquisition module configured to collect audio data;

a splitting module configured to split the audio data into audio data units of a plurality of preset byte lengths;

The encryption module is configured to encrypt each of the audio data units with a data encryption key to generate an encrypted file.

Optionally, the encryption module is further configured to: after the recording ends, encrypt the data encryption key by using an encryption key of the data encryption key, and store the encryption information in the encrypted file.

Optionally, the encryption module is further configured to: after the recording ends, obtain the set password, The password is encrypted with a password encryption key, and the encrypted information is stored in the encrypted file.

Optionally, the encryption module is further configured to: obtain the set password prompt information password prompt information and store the encrypted file.

Optionally, the encryption module is further configured to: after the recording ends, disguise the format of the encrypted file as a general audio file format.

The embodiment of the invention further provides a computer storage medium storing a computer program for executing the above-mentioned recording encryption method.

A recording encryption method provided by an embodiment of the present invention divides the collected original audio data into a plurality of audio data units, and then encrypts each audio data unit by using a data encryption key, and finally generates an encrypted file. Therefore, the audio content is confused. When an encrypted file is played by using a non-designated player or terminal, the content can be successfully played, but the content of the audio file cannot be restored, thereby achieving the purpose of protecting the security of the recorded data and the privacy of the user.

After the recording is finished, the data encryption key and password are further encrypted to further improve the security of the recorded data. In addition, the format of the encrypted file is also disguised as a general audio file format, making it difficult for others to find out which are encrypted files and which are non-encrypted files. When someone else uses an unspecified player or terminal to play an encrypted file, the encrypted file can be played as a general audio format file, but the audio data at this time is scrambled and confusing audio data, and cannot restore its real information. It further improves the security of recorded data and protects the privacy of users.

DRAWINGS

1 is a flow chart of a first embodiment of a recording encryption method of the present invention;

2 is a flow chart of a second embodiment of the recording encryption method of the present invention;

Figure 3 is a flow chart showing a third embodiment of the recording encryption method of the present invention;

Figure 4 is a flow chart showing a fourth embodiment of the recording encryption method of the present invention;

Figure 5 is a flow chart showing a fifth embodiment of the recording encryption method of the present invention;

Figure 6 is a flow chart showing a sixth embodiment of the recording encryption method of the present invention;

7 is a schematic diagram showing the composition of an encrypted file in an embodiment of the present invention;

Figure 8 is a block diagram showing the structure of an embodiment of the recording encryption device of the present invention;

Fig. 9 is a block diagram showing the hardware configuration of a recording encryption device according to an embodiment of the present invention.

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

detailed description

It is understood that the specific embodiments described herein are merely illustrative of the embodiments of the invention and are not intended to limit the invention.

Referring to FIG. 1, a first embodiment of a recording encryption method of the present invention is proposed. The recording encryption method includes the following steps:

Step S101: Start recording.

In this embodiment, the recording may be started automatically during a voice call, or the recording application may be started to start recording.

Step S102: Acquire audio data.

During the recording process, the audio data is continuously collected, and the collected audio data may be audio data in a format such as Pulse-code modulation (PCM) or Direct Stream Digital (DSD).

Step S103: Split the collected audio data into a plurality of audio data units of a preset byte length.

Specifically, it can be set to a length of 16-2 Mbytes, preferably 16-256 bytes in length, because the length of the byte is too long, which will affect the subsequent decryption speed, thereby affecting the smoothness of audio playback.

For example, the audio data of the PCM format is split as an audio data unit with a length of 16 bytes, and is split into a plurality of audio data units. Of course, it can also be split into audio data units of any byte length as needed, such as 32-byte length, 64-byte length, 128-byte length, and the like.

Step S104: encrypting each audio data unit by using a data encryption key to generate Encrypt the file.

Specifically, each audio data unit is encrypted by using a data encryption key (Data_Secret_Key), and the encrypted audio data unit is written into the file to generate an encrypted file.

Steps S102 to S104 are continued throughout the recording process.

Step S105: After the recording ends, the encrypted file is stored.

When the recording ends automatically after the call ends, or the user controls the recorder application to end the recording, and the audio data unit is completely encrypted, the encrypted file is encoded and compressed, and stored in the local or cloud.

Thus, the present embodiment confuses the audio content by splitting the most original audio data collected into a plurality of audio data units, and then encrypting each of the audio data units, thereby confusing the audio content when using a non-designated player Or when the terminal plays an encrypted file, it can successfully play, but cannot restore the content of the audio file, thereby achieving the purpose of protecting the security of the recorded data and the privacy of the user.

Referring to FIG. 2, a second embodiment of the recording encryption method of the present invention is proposed. The recording encryption method includes the following steps:

Step S201: Start recording.

Step S202: Acquire audio data.

Step S203: Split the collected audio data into a plurality of audio data units of a preset byte length.

Step S204: Encrypt each audio data unit with a data encryption key to generate an encrypted file.

Step S205: After the recording ends, the data encryption key is encrypted by using the encryption key of the data encryption key, and the encrypted information is stored in the encrypted file.

Step S206: storing the encrypted file.

Therefore, in this embodiment, after the end of the recording, the encryption key of the data encryption key is also utilized. (Data_Secret_Key_Key) encrypts the data encryption key (Data_Secret_Key), generates an encrypted information, and stores the encrypted information in the encrypted file, thereby further improving the security of the recorded data.

Referring to FIG. 3, a third embodiment of the recording encryption method of the present invention is proposed. The recording encryption method includes the following steps:

Step S301: Start recording.

Step S302: Acquire audio data.

Step S303: Split the collected audio data into a plurality of audio data units of a preset byte length.

Step S304: Encrypt each audio data unit with a data encryption key to generate an encrypted file.

Step S305: After the recording ends, the set password is obtained, the password is encrypted by the password encryption key, and the encrypted information is stored in the encrypted file.

Specifically, after the recording ends, the password input interface may be displayed, the password input by the user on the spot setting is obtained, and the password is encrypted by using the password encryption key, and an encrypted information is generated, and the encrypted information is stored in the encrypted file. Alternatively, the password can also be preset by the user and automatically applied to the preset encryption scene. After the recording ends, the password set by the user is automatically obtained and encrypted.

Step S306: storing the encrypted file. In this embodiment, the security of the recorded data is further improved by further encrypting the password.

Referring to FIG. 4, a fourth embodiment of the recording encryption method of the present invention is proposed. The recording encryption method includes the following steps:

Step S401: Start recording.

Step S402: Acquire audio data.

Step S403: Split the collected audio data into a plurality of audio data units of a preset byte length.

Step S404: Encrypt each audio data unit with a data encryption key to generate an encrypted file.

Step S405: After the recording ends, the set password and password prompt information are obtained, the password is encrypted by the password encryption key, and the encrypted information and the password prompt information are stored in the encrypted file.

Specifically, after the recording is finished, the password input interface and the password prompt information input interface may be displayed, and the order of the two input interfaces is not limited, and the password and password prompt information input by the user on the spot are obtained, and the password is encrypted by using the password encryption key. And generating an encrypted message, and storing the encrypted information and the password prompt information in the encrypted file. Alternatively, the password and password prompt information may also be preset by the user and automatically applied to the preset encryption scenario. After the recording is completed, the password and password prompt information preset by the user are automatically obtained and encrypted and saved. In some embodiments, the password hint information can also be encrypted.

Step S406: Store the encrypted file.

Therefore, on the basis of the third embodiment, the embodiment further saves the password prompt information to the encrypted file, thereby further improving the security of the recorded data.

Referring to FIG. 5, a fifth embodiment of the recording encryption method of the present invention is proposed. The recording encryption method includes the following steps:

Step S501: Start recording.

Step S502: Acquire audio data.

Step S503: Split the collected audio data into a plurality of audio data units of a preset byte length.

Step S504: Encrypt each audio data unit with a data encryption key to generate an encrypted file.

Step S505: After the recording ends, the format of the encrypted file is disguised as a general audio file format.

Specifically, after the recording is finished, the file header of the encrypted file is updated, so that the generated encrypted file is similar to the file of the general audio file specification, so that the surface appears to be encrypted like a general file. Audio file. The general audio file formats such as WAV format, WMA format, MP3 format, RA format, CD format, MID format, etc., for example, update the Wav file header, so that the generated encrypted file is similar to the wav specification file, and the encrypted file is disguised as a general Audio file.

Step S506: Store the encrypted file.

Thus, the present embodiment spoofs an encrypted file into a general audio file, making it difficult for others to find out which are encrypted files and which are non-encrypted files. When someone else uses an unspecified player or terminal to play an encrypted file, the encrypted file can be played as a general audio format file, but the audio data at this time is scrambled and confusing audio data, and cannot restore its real information. It further improves the security of recorded data and protects the privacy of users.

Referring to FIG. 6, a sixth embodiment of the recording encryption method of the present invention is proposed. The recording encryption method includes the following steps:

Step S601: Start recording.

Step S602: Acquire audio data.

Step S603: Split the collected audio data into a plurality of audio data units of a preset byte length.

Step S604: Encrypt each audio data unit with a data encryption key to generate an encrypted file.

Step S605: The recording ends.

Step S606: encrypt the data encryption key by using the encryption key of the data encryption key, and store the encrypted information in the encrypted file.

Step S607: Acquire the set password and password prompt information, encrypt the password with the password encryption key, and store the encrypted information and the password prompt information into the encrypted file.

Step S608: The format of the encrypted file is disguised as a general audio file format.

Step S609: Store the encrypted file.

This embodiment combines the technical features of the first embodiment to the fifth embodiment, and greatly improves the recording. The security of the audio data protects the privacy of the user.

As shown in FIG. 7, the generated encrypted file is encrypted by the encryption method of the present embodiment, and the encrypted file is masqueraded as an audio file in a WAV format, which includes a WAV format header file (Wav Header), encrypted information (Encrypted Info), and Encrypted Data. Among them, the WAV format header file is consistent with the general WAV format header file format, and is also 44 bytes long. The encrypted information describes the information such as the identifier of the encrypted file, the encryption key, and the like, including the encrypted encryption key (Decryption Key), the encrypted password (Password), and the password prompt information (Password Hint); the encrypted encryption. The key is stored with the data encryption key encrypted by the encryption key of the data encryption key, and is used to encrypt the key of the audio data portion; the encrypted password is encrypted by the password encryption key. The password related information is used to save the part of the recording encryption password set by the user; the password prompt information stores the password prompt information set by the user when starting the encrypted recording, and is displayed to the user to prompt the password when playing the encrypted file. information. Encrypt the audio data portion, that is, the encrypted audio data.

When the encrypted file of this embodiment is played by using a preset player or terminal, the decryption process is as follows:

1. First, determine whether the played audio file is an encrypted file. If yes, the password input interface is displayed to allow the user to input a password and display the password prompt information. If it is not an encrypted file, the normal playback process is started.

2. Decrypt the encrypted password stored in the encrypted file, and compare the decrypted password with the password entered by the user. If the password entered by the user is correct, the decryption playback starts, otherwise the user continues to enter the password.

3. After starting the decryption play, the data encryption key is obtained by decrypting the encryption key of the data encryption key.

4. Decrypt the encrypted audio data using the decrypted data encryption key to get the real PCM code stream.

5. Buffer a certain amount of PCM code stream and send it to AudioTrack for playback to obtain real audio information.

When playing an encrypted file with a non-designated player or terminal, the encrypted file can be played as a general audio format file, but the audio data at this time is scrambled and confused, and the real information cannot be restored. The sound is similar to noise, such as "sand" sound. Thereby, the security of the recorded data is improved, and the privacy of the user is protected.

Referring to FIG. 8, an embodiment of a recording encryption apparatus of the present invention is provided. The recording encryption apparatus includes an acquisition module 81, a splitting module 82, and an encryption module 83.

Acquisition module 81: configured to acquire audio data.

It can be started automatically during a voice call, or it can be started by the recorder application. During the recording process, the acquisition module continuously collects audio data, and the collected audio data may be audio data in a format such as PCM or DSD.

Split module 82: is configured to split audio data into audio data units of a plurality of preset byte lengths.

For example, the splitting module 82 splits the audio data of the PCM format into an audio data unit with a length of 16 bytes, and splits it into a plurality of audio data units. Of course, it can also be split into audio data units of any byte length as needed, such as 32-byte length, 64-byte length, 128-byte length, and the like.

Encryption module 83: configured to encrypt each audio data unit with a data encryption key to generate an encrypted file.

The encryption module 83 encrypts each audio data unit with a data encryption key, and writes the encrypted audio data unit into a file to generate an encrypted file. Collecting and disassembling during the entire recording process The distribution and encryption process continues. When the recording ends, the audio data unit is completely encrypted, and the encryption module encodes and compresses the encrypted file and stores it in the local or cloud. By encrypting the original PCM format audio data, the audio content is confused and the security of the recorded data is improved.

In the embodiment of the present invention, after the recording ends, the encryption module further encrypts the data encryption key by using the encryption key of the data encryption key, generates an encrypted information, and stores the encrypted information in the encrypted file to further improve the recorded data. safety.

In the embodiment of the present invention, after the recording ends, the encryption module further acquires a password set by the user on the spot or preset, encrypts the password by using a password encryption key, generates an encrypted information, and stores the encrypted information in the encrypted file, further Improve the security of recorded data.

In the embodiment of the present invention, the encryption module acquires the password prompt information set by the user on the spot or preset, and stores the password prompt information in the encrypted file. In some embodiments, the password hint information can also be encrypted. Thereby, the security of the recorded data is further improved.

In the embodiment of the present invention, after the recording ends, the encryption module masquerades the format of the encrypted file as a general audio file format. Specifically, the file header of the encrypted file is updated so that the generated encrypted file is similar to the file of the general audio file specification, so that the encrypted file is like a normal audio file. General audio file formats such as WAV format, WMA format, MP3 format, RA format, CD format, MID format, etc., for example, updating the WAV file header, so that the generated encrypted file is similar to the WAV specification file, and the encrypted file is disguised as a general Audio file. Thereby, the security of the recorded data is further improved.

Accordingly, the recording encryption apparatus of the present invention confuses by splitting the collected original audio data into a plurality of audio data units, and then encrypting each audio data unit with a data encryption key, and finally generating an encrypted file. Audio content improves the security of recorded data. When playing an encrypted file with a non-designated player or terminal, it can be played successfully without The method restores the content of the audio file to protect the security of the recorded data and the privacy of the user.

It should be noted that, when the recording encryption device provided by the above embodiment encrypts the recording, only the division of each functional module described above is used for illustration. In actual applications, the function distribution may be completed by different functional modules as needed. . In addition, the recording encryption device and the recording encryption method are provided in the same embodiment. The specific implementation process is described in the method embodiment, and the technical features in the device embodiment are applicable in the device embodiment. Narration.

In practical applications, the acquisition module 81 in the recording encryption device can be implemented by a microphone. The splitting module 82 and the encryption module 83 can be implemented by a central processing unit (CPU), a digital signal processor (DSP), or a field-programmable gate array (FPGA). Encrypted files can be stored in memory, such as flash memory. Encoding compression of an encrypted file can be implemented by an encoder. Finally, the compressed encrypted file can be saved in memory.

The microphone 91 collects a sound signal and converts the sound signal into an electrical signal (analog sound signal). The analog electrical signal is then sent to an audio processing circuit 96, which filters the analog electrical signal to reduce noise processing, and performs waveform shaping, gain enhancement, and the like on the electrical signal.

The audio processing circuit 96 is coupled to an analog to digital converter 97 that is analog to sound. The signal is analog-to-digital converted, and then the converted digital sound signal is sent to the CPU/DSP/FPGA 98 for splitting and encryption.

The CPU/DSP/FPGA 98 is connected to the encoder 99, and the encoder 99 encodes and compresses the split-encrypted digital sound signal, and then outputs the encoded compressed sound data to the bus 912.

The bus 912 is a transmission path for transmitting various data read or generated inside the recording encryption device.

The microcomputer 93 serves as a control unit for the entire recording encryption device. The microcomputer 93 is connected to a microphone control circuit 92, an operation unit 95, and a flash memory 94.

The microphone control circuit 92 controls the microphone to make corresponding adjustments based on instructions issued by the microcomputer 93, for example, adjusting the volume and the like.

The operation unit 95 includes but is not limited to a physical button or a virtual button, and the entity or virtual button may be a power button, a camera button, an edit button, a dynamic image button, a reproduction button, a menu button, a cross button, an OK button, a delete button, and an enlarge button. The operation members such as various input buttons and various input keys are detected, and the operation states of these operation members are detected. The detection result is output to the microcomputer 93.

The flash memory 94 stores programs for executing various processing sequences of the microcomputer 93. Further, the flash memory 94 stores various adjustment values of the microphone, and the microcomputer 94 reads out the adjustment value, and performs control of the microphone in accordance with the adjustment value.

The memory interface 910 is connected to the storage medium 911, and the encoded compressed sound data can be stored in the storage medium 911 through the memory interface 910. The storage medium 911 is a medium such as a memory/card that can be detachably attached to the recording encryption device. However, the storage medium 911 is not limited thereto, and may be a hard disk or the like built in the recording encryption device.

It will be understood by those skilled in the art that all or part of the steps of the foregoing embodiments may be implemented by a program to control related hardware, and the program may be stored in a computer. The storage medium may be read, and the storage medium may be a ROM/RAM, a magnetic disk, an optical disk, or the like.

The apparatus for tracking the service signaling according to the embodiment of the present invention may also be stored in a computer readable storage medium if it is implemented in the form of a software function module and sold or used as a separate product. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium, including a plurality of instructions. A computer device (which may be a personal computer, server, or network device, etc.) is caused to perform all or part of the methods described in various embodiments of the present invention. The foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read only memory (ROM), a magnetic disk, or an optical disk. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

Correspondingly, an embodiment of the present invention further provides a computer storage medium, wherein a computer program is stored, and the computer program is used to execute the recording encryption method of the embodiment of the present invention.

The preferred embodiments of the present invention have been described above with reference to the drawings, and are not intended to limit the scope of the invention. A person skilled in the art can implement the invention in various variants without departing from the scope and spirit of the invention. For example, the features of one embodiment can be used in another embodiment to obtain a further embodiment. Any modifications, equivalent substitutions and improvements made within the technical concept of the invention are intended to be included within the scope of the invention.

Claims

A recording encryption method, including:

Acquiring audio data during recording;

Splitting the audio data into audio data units of a plurality of preset byte lengths;

Each of the audio data units is encrypted using a data encryption key to generate an encrypted file.
The recording encryption method according to claim 1, wherein the encrypting each of the audio data units by using a data encryption key to generate an encrypted file further comprises:

After the recording is completed, the data encryption key is encrypted using the encryption key of the data encryption key, and the encrypted information is stored in the encrypted file.
The recording encryption method according to claim 1, wherein the encrypting each of the audio data units by using a data encryption key to generate an encrypted file further comprises:

After the recording is completed, the set password is obtained, the password is encrypted by the password encryption key, and the encrypted information is stored in the encrypted file.
The recording encryption method according to claim 3, wherein the obtaining the set password further comprises: acquiring the set password prompt information password prompt information and storing the encrypted file.
The recording encryption method according to claim 1, wherein the encrypting each of the audio data units by using a data encryption key to generate an encrypted file further comprises: disguising the format of the encrypted file as General audio file format.
The recording encryption method according to any one of claims 1 to 5, wherein the audio data is pulse code modulated audio data of a PCM format.
The recording encryption method according to any one of claims 1 to 5, wherein the preset byte length is 16-256 bytes in length.
A recording encryption device includes an acquisition module, a split module and an encryption module, wherein:

An acquisition module configured to collect audio data;

a splitting module configured to split the audio data into audio data units of a plurality of preset byte lengths;

The encryption module is configured to encrypt each of the audio data units with a data encryption key to generate an encrypted file.
The recording encryption device according to claim 8, wherein the encryption module is further configured to: after the end of the recording, encrypt the data encryption key with an encryption key of the data encryption key, and store the encrypted information The encrypted file.
The recording encryption device according to claim 8, wherein the encryption module is further configured to: after the recording ends, acquire the set password, encrypt the password with a password encryption key, and store the encrypted information in the Encrypt the file.
The recording encryption device according to claim 10, wherein the encryption module is further configured to: acquire the set password prompt information password prompt information and store the encrypted file.
The recording encryption device according to claim 8, wherein the encryption module is further configured to disguise the format of the encrypted file as a general audio file format after the recording ends.
The recording encryption device according to any one of claims 8 to 12, wherein the audio data is audio data in a PCM pulse code modulation format.
The recording encryption method according to any one of claims 8 to 12, wherein the preset byte length is 16-256 bytes in length.
A computer storage medium having stored therein computer executable instructions configured to perform the recording encryption method of any of claims 1-7.