CN106788959B - encryption voice synchronization method for PDT cluster system - Google Patents
encryption voice synchronization method for PDT cluster system Download PDFInfo
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- CN106788959B CN106788959B CN201611214341.4A CN201611214341A CN106788959B CN 106788959 B CN106788959 B CN 106788959B CN 201611214341 A CN201611214341 A CN 201611214341A CN 106788959 B CN106788959 B CN 106788959B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
- H04L7/046—Speed or phase control by synchronisation signals using special codes as synchronising signal using a dotting sequence
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/02—Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
Abstract
The invention discloses an encryption voice synchronization method of a PDT cluster system, wherein the encryption voice synchronization adopts continuous synchronization and comprises first synchronization and subsequent synchronization. Compared with the prior art, the invention has the following positive effects: the length of the IV is doubled, so that the data repetition probability is greatly reduced, and the system safety is improved; the IV is synchronously and continuously sent for 3 times for the first time, and the receiving end can receive the IV once at any time, so that the success rate of voice connection is ensured; the subsequent synchronization period is short, even if the synchronization is out of step due to channel error codes, the synchronization can be re-performed after 1440ms, and the influence on the user experience is small; the terminal supports delayed network access, and the terminal started later can receive subsequent synchronous encrypted voice communication; the synchronous information does not occupy any voice data overhead, so that the voice quality is improved; all synchronous data adopt BPTC error correction coding, so that the error code resistance of encrypted voice communication is greatly improved, the communication distance can be effectively increased, and the voice communication quality is improved.
Description
Technical Field
The invention belongs to the technical field of mobile communication safety, and particularly relates to a high-reliability encryption voice synchronization implementation method based on a PDT (data processing) cluster system.
Background
The PDT cluster system is a cluster standard based on completely independent intellectual property rights and released by the ministry of public security, has the functions of voice, short data communication, scheduling and the like, provides a wireless voice and short data scheduling communication means with strong mobility and convenient use for occasions such as daily duty, emergency communication, transportation and the like of users, can effectively realize the 'communication in motion' capability of the users, and provides efficient wireless command scheduling and communication guarantee for the users.
In order to ensure the safety of scheduling and communication in the PDT cluster communication system, a voice encryption function is also introduced, and end-to-end encryption of voice communication is realized. In order to realize voice encryption communication, voice frames of both transmitting and receiving sides must be kept strictly synchronous, and encryption voice synchronization is realized by IV (initial vector) and FN (frame number) in PDT cluster security standard, but the encryption voice synchronization scheme also has the following problems:
1) IV length is only 48bit, variation is only 2.8 × 1014Too short IV length tends to increase the IV repeat probability and reduce its safety. Second, the IV change was based on the FN count cycle, with one change at 4.096 minutes, and with too low a frequency of change, it also decreasedThe safety is low.
2) The FN consists of 12 bits and is inserted in the speech data, one more for each frame of speech FA sent. The disadvantage of this scheme is that FN takes up 12bit data of speech coding, causing the speech quality to decline; secondly, error correction coding is not carried out during FN sending to improve the error-resisting capability of the FN, so that the FN easily generates error codes, the whole 60ms voice frame can not be decrypted completely, when the channel error codes are serious, a plurality of continuous 60ms voice frames can not be decrypted, and a receiving end shows that voice is intermittent or noise, thereby seriously influencing the user experience and the communication distance. Thirdly, the change period of the FN is very short, and the safety significance of the system is not great.
Aiming at various defects of PDT voice encryption, the invention redesigns the voice encryption synchronization, not only increases the length of IV, improves the synchronization period, but also does not occupy the expense of voice frames, and realizes high-reliability encryption voice synchronization on the premise of ensuring PDT voice encryption security and not losing voice quality.
Disclosure of Invention
In order to overcome the above disadvantages of the prior art, the present invention provides an encrypted voice synchronization method for PDT cluster system.
The technical scheme adopted by the invention for solving the technical problems is as follows: an encryption voice synchronization method of a PDT cluster system adopts continuous synchronization, which is divided into first synchronization and subsequent synchronization, wherein:
(1) first synchronization: when a terminal initiates an end-to-end encrypted voice call, a sender mobile station forms 12 bytes of IV into an encryption control frame which is synchronized for the first time and then sends the encryption control frame by using a PI head frame, and continuously sends three groups of encryption control frames, wherein each group of encryption control frames occupies two PI head frames; the receiver decrypts the ciphertext voice after obtaining the correct IV;
(2) Subsequent synchronization: periodically sending IV, forming a subsequent synchronous encryption control frame by 12 bytes of IV, and sending the subsequent synchronous encryption control frame in an embedded signaling of a PDT channel, wherein the sending period is four superframes; the receiving end extracts the encrypted control frames from the embedded signaling of the two superframes to combine into IV data for voice processing of the following four superframes.
Compared with the prior art, the invention has the following positive effects:
(1) The length of the IV is doubled, the data repetition probability is greatly reduced, and the system safety is improved.
(2) the IV is synchronously and continuously sent for 3 times for the first time, and the receiving end can receive the IV once at will, so that the success rate of voice connection is ensured.
(3) The subsequent synchronization period is short, even if the synchronization is out of step due to channel error codes, the synchronization can be re-performed after 1440ms, and the influence on the user experience is small.
(4) and the terminal supports delayed network access, and the terminal started later can receive subsequent synchronization to realize encrypted voice communication.
(5) The synchronous information does not occupy any voice data overhead, and the voice quality is improved.
(6) all synchronous data adopt BPTC error correction coding, so that the error code resistance of encrypted voice communication is greatly improved, the communication distance can be effectively increased, and the voice communication quality is improved.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a timing diagram of encrypted speech;
FIG. 2 is a format of a first-time synchronous encryption control frame;
Fig. 3 shows the format of the subsequent synchronous encryption control frame.
Detailed Description
PDT encrypted voice synchronization adopts continuous synchronization, which is divided into first synchronization and subsequent synchronization. To enhance its security, the IV is increased to 12 bytes, and the occupation of the FN on the voice frame is also eliminated, so as to improve the voice quality and the call distance.
When the terminal initiates an end-to-end encrypted voice call, the sender mobile station forms 12 bytes IV into a first synchronous encrypted control frame and then sends the encrypted control frame by using a PI header frame. In order to prevent the encryption control frame damage caused by channel error codes, 3 groups of encryption control frames are continuously sent in the first synchronization, each group of encryption control frames occupies 2 PI head frames (120ms), the receiving party realizes synchronization by arbitrarily receiving one group of encryption control frames so as to ensure that the receiving party obtains correct IV before decrypting ciphertext voice, and the IV of the first synchronization is used as an initial vector for encrypting and decrypting voice data of subsequent 4 voice superframes.
In order to resist the error code and fading of the wireless channel and ensure that the mobile station accessing the network later can correctly decrypt the voice stream, the method of periodically sending 12 bytes IV in the subsequent synchronization is adopted to ensure the communication quality of the voice communication. The subsequent synchronization is sent in embedded signaling in the PDT channel by composing the IV into encrypted control frames for the subsequent synchronization. The subsequent synchronization period is 1440ms, i.e., 4 groups of superframes are synchronized once. The embedded signaling of the first and second superframes is used to transmit encrypted control frames for subsequent synchronization, and the embedded signaling of the third and fourth superframes can be used to transmit other control information. If the receiving party does not receive the correct encryption control frame, the receiving party needs to continue waiting for the encryption control frame carrying the IV information, and meanwhile, the mute state is kept. After receiving the correct encryption control frame, the receiving party extracts the IV information from the encryption control frame to the cryptographic module as the initial vector for speech decryption of the next 1440ms speech frame. The timing diagram of encrypted speech is shown in fig. 1.
(1) First time synchronization
The voice encryption first synchronous encryption control frame is carried by the P _ ESU or P _ ESD at the beginning of voice (frame type is PI header frame). Since each PI header frame can carry a 72-bit payload, each IV (96bit) is divided into two portions of data (48 bits per set), each set of data having 8-bit frame numbers, e.g., the first set of sequence numbers of the first IV is 11H (hexadecimal, the same applies hereinafter), the second set of sequence numbers is 12H (hexadecimal), the first set of sequence numbers of the second IV is 21H, the second set of sequence numbers is 22H, and so on. And finally, calculating a checksum (16bit) for each group of data, carrying out error correction coding and interleaving through BPTC, and then sending the data through two PI head frames. And the data is continuously sent for three times, and the receiving end can receive the data once at will, so that the receiving synchronization probability is ensured. The receiving end receives the PI head frame, extracts the encryption control frame to calculate the check sum, combines the two parts of data into a complete IV, calculates the initial position of the encryption speech frame according to the frame number, if the first IV is received, the decryption is carried out after delaying 4 PI head frames, if the second IV is received, the decryption is carried out after delaying 2 PI head frames, if the third IV is received, the decryption is carried out without delaying, and the next received speech frame is decrypted, thereby ensuring the strict speech frame synchronization. The transmission format of the first-time sync-encryption control frame is shown in fig. 2.
(2) subsequent synchronization
And the subsequent synchronization adopts embedded signaling to transmit the encrypted control frame, and the transmission period is 4 superframes (1440 ms). Because the embedded signaling of each superframe can only carry a 72-bit payload, each IV (96bit) plus checksum (16bit) is divided into two parts of data (one group of 72 bits and one group of 40 bits), and the data is transmitted through the embedded signaling of two superframes after BPTC error correction coding and interleaving. The remaining two superframes of embedded signaling may be used to send other control information of the system, such as link control information. And the receiving end extracts the encrypted control frames from the embedded signaling of the two superframes to combine into IV data for voice processing of the next 4 superframes. The receiving end firstly calculates the check sum, if the check sum passes, the subsequent decryption processing is carried out, and if the check fails, the mobile station is informed to output mute to wait for the next synchronization. The format of the subsequent synchronous encryption control frame is shown in fig. 3.
Claims (7)
1. An encryption voice synchronization method for a PDT cluster system is characterized in that: the encrypted voice synchronization adopts continuous synchronization, which is divided into first synchronization and subsequent synchronization, wherein:
(1) First synchronization: when a terminal initiates an end-to-end encrypted voice call, a sender mobile station forms 12 bytes of IV into an encryption control frame which is synchronized for the first time and then sends the encryption control frame by using a PI head frame, and continuously sends three groups of encryption control frames, wherein each group of encryption control frames occupies two PI head frames; the receiver decrypts the ciphertext voice after obtaining the correct IV;
(2) subsequent synchronization: periodically sending IV, forming a subsequent synchronous encryption control frame by 12 bytes of IV, and sending the subsequent synchronous encryption control frame in an embedded signaling of a PDT channel, wherein the sending period is four superframes; the receiver extracts the encrypted control frames from the embedded signaling of the two superframes to assemble IV data for voice processing of the next four superframes.
2. the PDT cluster system encryption voice synchronization method of claim 1, wherein: the first synchronized encryption control frame is carried by P _ ESU or P _ ESD when voice starts, the frame type is PI head frame, each IV is 96bit, the frame is divided into two groups of data, each group of data is 48bit, 8bit frame number is added, finally 16bit check sum is calculated, and the two PI heads are used for sending after BPTC error correction coding and interweaving.
3. the PDT cluster system encryption voice synchronization method of claim 2, wherein: the method for decrypting the ciphertext voice after the first synchronous receiver obtains the correct IV comprises the following steps: the receiving party receives the PI head frame, extracts the encryption control frame and calculates the checksum, combines the two parts of data into a complete IV, calculates the initial position of the encryption speech frame according to the frame number, if the first IV is received, the decryption is carried out after delaying four PI head frames, if the second IV is received, the decryption is carried out after delaying two PI head frames, if the third IV is received, the decryption is carried out without delaying, and the next received speech frame is decrypted.
4. The PDT cluster system encryption voice synchronization method of claim 1, wherein: each IV of the subsequent synchronization is 96 bits, and the sum of 16 bits of check sum is 112 bits, and the subsequent synchronization is divided into two groups of data, one group of 72 bits and one group of 40 bits, and after BPTC error correction coding and interleaving, the subsequent synchronization is transmitted through embedded signaling of two superframes.
5. The PDT cluster system encryption voice synchronization method of claim 4, wherein: the remaining two superframes embed signaling for sending other control information for the system.
6. The PDT cluster system encryption voice synchronization method of claim 1, wherein: the receiving party of the subsequent synchronization firstly combines the two groups of received data, then calculates the check sum, if the check sum passes the check sum, the subsequent decryption processing is carried out, if the check sum fails, the mobile station is informed to output mute, and the next synchronization is waited.
7. The PDT cluster system encryption voice synchronization method of claim 6, wherein: after receiving the correct encryption control frame, the receiver of the subsequent synchronization extracts IV information from the encryption control frame to the cryptographic module as the initial vector for the decryption of the voice data of the next four groups of voice superframes.
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