CN102307075A - Voice transmission encryption method of DMR (digital mobile radio) communication terminal - Google Patents
Voice transmission encryption method of DMR (digital mobile radio) communication terminal Download PDFInfo
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- CN102307075A CN102307075A CN201110227029A CN201110227029A CN102307075A CN 102307075 A CN102307075 A CN 102307075A CN 201110227029 A CN201110227029 A CN 201110227029A CN 201110227029 A CN201110227029 A CN 201110227029A CN 102307075 A CN102307075 A CN 102307075A
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Abstract
The invention discloses a voice transmission encryption method of a DMR (digital mobile radio) communication terminal. In the method, a corresponding key table is arranged in a DMR communication terminal sender and a DMR communication terminal receiver; the DMR communication terminal sender uses keys in the key table to encrypt voice information and send the voice information and key index code information; and the DMR communication terminal receiver searches the corresponding keys in the key table to decrypt and play the voice information in accordance with the key index code information. In the method, when the DMR communication terminal converses and sends the voice superframes, a valid data region of 48BIT in F frames is utilized to transfer the key index information; and the keys are updated once per 360ms, so that the keys are updated in real time to preferably realize the confidentiality of the conversation.
Description
Technical field
The present invention discloses a kind of voice transfer encryption method, particularly a kind of voice transfer encryption method of DMR communicating terminal.
Background technology
DMR is the abbreviation of Digital Mobile Radio; It is the consensus standard that European digital handset uses; In the DMR agreement regulation how to carry out the encryption of voice call, if the DMR communicating terminal is applied to that public security etc. needs the field of encrypted voice then the level security that can't accomplish to converse.
Summary of the invention
The shortcoming that does not have the encryption of voice call to the above-mentioned DMR communicating terminal of mentioning of the prior art; The present invention provides a kind of voice transfer encryption method of DMR communicating terminal; It utilizes key that voice messaging is encrypted transmission, simultaneously, key index table information is sent together; The recipient finds corresponding key according to key index sign indicating number information voice messaging is deciphered in key list, and plays.
The technical scheme that the present invention solves its technical problem employing is: a kind of voice transfer encryption method of DMR communicating terminal; This method is to be provided with corresponding key list in DMR communicating terminal transmit leg and the DMR communicating terminal recipient; DMR communicating terminal transmit leg utilizes the key in the key list that voice messaging is encrypted, sent; Simultaneously key index sign indicating number information is sent together; DMR communicating terminal recipient finds corresponding key according to key index sign indicating number information voice messaging is deciphered in key list, and plays.
The technical scheme that the present invention solves its technical problem employing further comprises:
When described DMR communicating terminal is launched voice; Every 360MS sends a superframe; DMR communicating terminal transmit leg utilizes key that the voice messaging in the superframe is encrypted transmission, utilizes the zone of the invalid data of the 48bit in the middle of the F frame of each superframe to send key index sign indicating number information.
Described each key is only encrypted the voice messaging in this superframe.
The zone of the invalid data of described 48bit all is a key index sign indicating number information.
The zone of the invalid data of described 48bit is the information after key index sign indicating number information is carried out the FEC coding.
The invention has the beneficial effects as follows: when the present invention launches voice superframes when the DMR communicating terminal is conversed; Utilize the invalid data district of the 48BIT in the F frame to transmit key index information; Every 360ms upgrades a secondary key, plays the real-time update key, can be good at realizing call confidentiality.
To combine accompanying drawing and embodiment that the present invention is further specified below.
Description of drawings
Fig. 1 is the superframe data structure sketch map in the DMR communicating terminal voice call process among the present invention.
Fig. 2 forms sketch map for the superframe in the DMR communicating terminal voice call process among the present invention.
Fig. 3 is F frame data structure sketch map among the present invention.
Fig. 4 is embodiment one invalid data district data structure sketch map among the present invention.
Fig. 5 is embodiment two invalid data district data structure sketch mapes among the present invention.
Embodiment
Present embodiment is the preferred embodiment for the present invention, and other all its principles are identical with present embodiment or approximate with basic structure, all within protection range of the present invention.
The present invention is mainly a kind of voice transfer encryption method of DMR communicating terminal; It is provided with corresponding key list in DMR communicating terminal transmit leg and DMR communicating terminal recipient; DMR communicating terminal transmit leg utilizes the key in the key list that voice messaging is encrypted, sent; Simultaneously key index sign indicating number information is sent together, DMR communicating terminal recipient finds corresponding key according to key index sign indicating number information voice messaging is deciphered in key list, and plays.Stipulate in the DMR agreement that the DMR terminal is superframe of every 360ms emission in the voice call process, please referring to accompanying drawing 1 and accompanying drawing 2; Each superframe comprises six Frames of ABCDEF; And the middle 48BIT of F frame transmits is invalid data (please referring to accompanying drawing 3), i.e. said invalid data district among the present invention, and what the present invention promptly utilized is the time zone of this 48BIT; Send key index sign indicating number information, utilize this key that the voice messaging in this superframe is encrypted transmission simultaneously.The corresponding key of key index sign indicating number information in each superframe is only encrypted the voice messaging in this superframe; When next superframe sends; Utilize the corresponding key of key index sign indicating number information in the corresponding superframe only the voice messaging in this superframe to be encrypted; Accomplish that promptly every 360ms upgrades a secondary key, play the real-time update key, can be good at realizing call confidentiality.
Among the present invention; Utilize the zone of invalid data of 48 bit of F frame to transmit key index sign indicating number information; Maximum
the individual key of supporting; The zone of invalid data that is 48bit is when all being key index sign indicating number information; Key index sign indicating number information is not carried out the FEC encoding operation, please referring to accompanying drawing 4.During practical implementation; The user can be provided with the key number of oneself according to specific circumstances; And can use certain FEC coded system to reduce the error rate according to the applicable cases of reality; For example use GOLAY (12; 24) then maximum
individual key of supporting of coding, the recipient can correct any three or the combination of random error still less.This kind transmits the mode of key index, and the key number is selected flexibly, and the FEC coding mode selection is free, can carry out corresponding conversion according to the needs of the application of reality, satisfies the demand of client for encrypted voice to greatest extent.The FEC coding also can adopt conventional FEC coding method, does not specifically list one by one, please referring to accompanying drawing 5 here.
Specify with the data format of two instantiations below the invalid data district of the 48bit among the present invention:
(1), please referring to accompanying drawing 4, do not carry out the FEC coding, this 48BIT information is all effective information.
For example: the key index value of the F frame transmission of first superframe of transmitting party is 32767; Then the position of this 48BIT is respectively 00,00_,000,0_0,000,_00,00_,000,0_0,000,_00,00_,000,0_0,111,_11,11_,111,1_1 111; Transmitting party is received after these data the key that inquiry in the key list 32767 is corresponding, and the voice that solve this superframe are emitted.
(2) please referring to accompanying drawing 5, carry out the FEC coding, then the information of 48 BIT is not index information entirely, has also comprised the expansion check digit.For example: using GOLAY (12,24) coding, can be index value according to preceding 12BIT then, and next 12BIT is the expansion check digit, and last 24BIT is the invalid information position, also can be according to client's practical application order of presentation.Use this coding can correct any three or the combination of random error still less of key index.The recipient carries out in key list, inquiring about corresponding key again behind the fec decoder, and the voice that solve this superframe are emitted.
When the present invention launches voice superframes when the DMR communicating terminal is conversed, utilize the invalid data district of the 48BIT in the F frame to transmit key index information, every 360ms upgrades a secondary key, plays the real-time update key, can be good at realizing call confidentiality.
Claims (5)
1. the voice transfer encryption method of a DMR communicating terminal; It is characterized in that: described method is to be provided with corresponding key list in DMR communicating terminal transmit leg and the DMR communicating terminal recipient; DMR communicating terminal transmit leg utilizes the key in the key list that voice messaging is encrypted, sent; Simultaneously key index sign indicating number information is sent together, DMR communicating terminal recipient finds corresponding key according to key index sign indicating number information voice messaging is deciphered in key list, and plays.
2. the voice transfer encryption method of DMR communicating terminal according to claim 1; It is characterized in that: when described DMR communicating terminal is launched voice; Every 360MS sends a superframe; DMR communicating terminal transmit leg utilizes key that the voice messaging in the superframe is encrypted transmission, utilizes the zone of the invalid data of the 48bit in the middle of the F frame of each superframe to send key index sign indicating number information.
3. the voice transfer encryption method of DMR communicating terminal according to claim 2 is characterized in that: described each key is only encrypted the voice messaging in this superframe.
4. according to the voice transfer encryption method of claim 2 or 3 described DMR communicating terminals, it is characterized in that: the zone of the invalid data of described 48bit all is a key index sign indicating number information.
5. according to the voice transfer encryption method of claim 2 or 3 described DMR communicating terminals, it is characterized in that: the zone of the invalid data of described 48bit is the information after key index sign indicating number information is carried out the FEC coding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110227029A CN102307075A (en) | 2011-08-09 | 2011-08-09 | Voice transmission encryption method of DMR (digital mobile radio) communication terminal |
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| CN201110227029A CN102307075A (en) | 2011-08-09 | 2011-08-09 | Voice transmission encryption method of DMR (digital mobile radio) communication terminal |
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| CN103402198A (en) * | 2013-07-28 | 2013-11-20 | 浙江宏睿通信技术有限公司 | Encryption parameter transmitting method of wireless communication terminal equipment |
| CN104009838A (en) * | 2014-05-07 | 2014-08-27 | 上海文广互动电视有限公司 | Multimedia content piecewise encryption method |
| CN112218291A (en) * | 2019-07-12 | 2021-01-12 | 海能达通信股份有限公司 | Voice communication method, base station, mobile terminal, and computer-readable storage medium |
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| CN112218291A (en) * | 2019-07-12 | 2021-01-12 | 海能达通信股份有限公司 | Voice communication method, base station, mobile terminal, and computer-readable storage medium |
| CN112218291B (en) * | 2019-07-12 | 2023-12-19 | 海能达通信股份有限公司 | Voice communication method, base station, mobile terminal and computer readable storage medium |
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Address after: 518000 Guangdong city of Shenzhen province Nanshan District Song Ping Shan Qi Min Road No. 1 building 5-6 Betel Applicant after: Kirisun Communication Co., Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District Song Ping Shan Qi Min Road No. 1 building 3-6 Betel Applicant before: Shenzhen Kirisun Electronics Co., Ltd. |
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Application publication date: 20120104 |