CN100395973C - High-reliability cipher synchronizing method in mobile communication - Google Patents

High-reliability cipher synchronizing method in mobile communication Download PDF

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CN100395973C
CN100395973C CN 02127963 CN02127963A CN100395973C CN 100395973 C CN100395973 C CN 100395973C CN 02127963 CN02127963 CN 02127963 CN 02127963 A CN02127963 A CN 02127963A CN 100395973 C CN100395973 C CN 100395973C
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password
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CN1507195A (en
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勇 曾
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中国电子科技集团公司第三十研究所
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Abstract

一种移动通讯密码同步的方法。 One method of mobile communication password synchronization. 由同步码编码、调制、发送、同步码接收和后续密码同步保护等步骤共同完成。 Transmitted by the synchronization code encoding, modulation, and preamble receiving a subsequent password synchronization step together complete protection. 在确定同步头、产生消息密钥、完成消息密钥的BCH编码、组成原始同步码、将原始同步码用BARKER码进行调制、扩展后定时发送。 In determining the synchronization header, the message key generation, the key message is completed BCH codes, constituting the original preamble, the preamble are modulated with the original code BARKER, after the transmission timing of expansion. 接收时对接收信息按位进行大数判决和BCH译码得到正确的消息密钥。 Large numbers of received information and BCH-decoded correct decision message key bit is received. 在同步保护状态内对后续密码进行同步保护。 Password protection for subsequent synchronization in the synchronization protection state. 本发明将多种同步技术和纠错技术融合在一起,实现了在无线通信中的密码同步的高可靠性和抗干扰性。 The present invention will be more synchronization and error correction techniques together to achieve high reliability and robustness of wireless communications in a cryptographic synchronization. 当信道误码率为1×10<sup>-1</sup>时同步概率达到96%。 When the channel error rate is 1 × 10 <sup> -1 </ sup> 96% probability of synchronization.

Description

移动通信中高可靠性密码同步的方法 A method in a mobile communication with high reliability cryptosync

技术领域 FIELD

本发明属电通信技术的保密通信范畴,具体是一种高可靠移动通信密码同步的方法。 The present invention belongs to the scope of secure communication in electrical communication technology, in particular a highly reliable method for synchronizing a mobile communications password.

背景技术 Background technique

对无线信道而言,密码同步技术直接关系到保密通信的成败和安全性。 On the radio channel, the password synchronization technology is directly related to the success and security of confidential communications. 目前, 用于无线信道的保密机的密码同步有两种方式, 一次同步和连续同步。 At present, the password for the wireless channel crypto synchronization in two ways, the first synchronization and continuous synchronization. 一次同步指在每次通信前只发送一次密码同步,密码失步恢复由报错机制完成。 A synchronization means in each communication sent only once before the password synchronization, a password is completed by the step-error recovery mechanisms. 连续同步指在通信过程中定时发送密码同步,失步后自动搜索同步码,无须报错。 It means a continuous synchronization timing of transmission in the communication process password synchronization, auto search desynchronization preamble without error. 一般短波保密机采用一次同步,超短波采用连续同步。 Usually a short time using the crypto synchronization ultrashort continuous synchronization. 一次同步的主要问题是当信道误码率很高的时候,密码同步的报错将非常频繁,直接导致通信效率的严重下降。 The main problem is that when a synchronous high channel bit error rate when password synchronization error will be very frequent, leading to a serious decline in direct communication efficiency. 连续同步则在信道误码率很高的时候面临可靠性下降的问题,当信道误码率为1X10"时根本不能可靠工作。近年来,保密通信已越来越引起人们关注,但可靠性的问题一直是不易解决的问题。中国专利1050294《移动式无线通信系统中的同步方法》公开了一种加密同步的方法。这种方法使用的技术较单一,效果较为有限。 Continuous synchronization are facing in the high channel bit error rate when the issue of the reliability of decline, when the channel bit error rate 1X10 "simply does not work reliably. In recent years, more and more secure communication has caused concern, but the reliability of has been a difficult problem to solve. Chinese Patent No. 1050294 "mobile radio communication system synchronization method" discloses a method of encryption synchronization. this method uses the technique than a single, more limited effect.

发明内容 SUMMARY

本发明的目的是提供一种可靠性高,抗干扰性强的密码同步方法,使用本方法,在信道误码率高的情况下同步概率仍然能保持很高水平。 Object of the present invention is to provide a highly reliable, strong anti-interference code synchronization method, using the present method, in the case where the channel bit error rate probability of synchronization can still maintain a high level.

本发明的目的是这样达到的: 一种无线信道的保密机的密码同步方法,采用连续密码同步方式,每2秒同步一次,由同步码编码、调制后发送、同步码接收和后续密码同步保护步骤共同完成。 Object of the present invention is achieved in that: one radio channel confidential password synchronization method machines, continuous mode password synchronization, a synchronization every 2 seconds, after the transmitted modulated encoded by a preamble, and subsequent preambles received password synchronization protected steps together to complete. 所述同步码的编码、调制、发送是指同步码 The synchronization code encoding, modulation, transmission means preamble

包含ll字节的同步信息,在确定同步头、产生消息密钥、将消息密钥分成两组, 将分组后的消息密钥进行BCH编码,得到BCH (31, 21) A和BCH (31, 21) B;纟且成原始同步码后,将原始同步码用BARKER码进行调制、扩展为7组后定时发送。 Ll byte contains synchronization information, the synchronization header is determined, generating a message key, the message key is divided into two groups, the key message packet BCH coding, to give BCH (31, 21) A, and BCH (31 is, 21) B; and Si to the original after the preamble, the preamble are modulated with the original code BARKER, extended time to send the 7 groups. 所述同步码的接收是指对接收信息按位进行大数判决,得到正确的BCH (31, 21) A和BCH (31, 21) B并译出消息密钥。 The preamble receiving means for receiving the information bit decision large numbers, correct BCH (31, 21) A, and BCH (31, 21) B translated message and the key. 所述后续密码保护是指首次密码同步收到后即进入同步保护状态,在同步保护状态内,按事先确定的在规定的时间内未收到同步头或收消息密钥有误的次数限定,在限定的范围内仍按规定的时刻从密码中提取消息密钥进行密码同步处理,保持与发方的密码同步。 Password protection refers to the subsequent first received after entering the password synchronization synchronization protection state within the synchronization protection state, according to pre-determined period of time is within a predetermined synchronization header is not received or the received message defines the number of bad key, based upon predetermined timing within the range defined in the message key to extract the password from the password synchronization, maintaining synchronization with the sender password.

所述同步码的编码、调制、发送具有以下步骤;①首先确定3字节同步头SH1 、 SH2、 SH3;②将5字节消息密钥(IK)分成两组,每组20bit记为IKA 和1KB,分别将IKA和IKB末尾补一个'0'构成21bit再分别进行BCH (31, 21)编码,记为BCH (31, 21) A和BCH (31, 21) B;③缓存BUFi, il, 2,…11以字节为单位,将SH1、 SH2、 SH3按字节分别存入缓存BUF1、 BUF2 和BUF3 ,将BCH(31,21)A按字节存入缓存BUF4 、BUF5 、BUF6和BUF7, BUF7的最末位填'0'以补足8位,将BCHG1, 21)B按字节存入缓存BUF8 、 BUF9、 BUF10和BUFll, BUF11的最末位填'0' 以补足8位,至此完成11 The synchronization code encoding, modulation, transmission having the following steps; ① 3-byte synchronization header is first determined SH1, SH2, SH3; ② the 5-byte message key (IK) into two groups referred to as 20bit and IKA 1KB, respectively, IKA and end IKB make a '0' form 21bit then separately BCH (31, 21) code, referred to as a BCH (31, 21) a, and BCH (31, 21) B; ③ cache BUFi, il, 2, ... 11 bytes, the SH1, SH2, SH3 bytes are stored in the buffer BUF1, BUF2 and BUF3, the BCH (31,21) A byte stored in the buffer BUF4, BUF5, BUF6 and BUF7 , BUF7 fill the last bit '0' to make up 8 will BCHG1, 21) B bytes into the cache BUF8, BUF9, BUF10 and BUFll, BUF11 fill the last bit '0' to make up 8, so far complete 11

字节的同步码的原始编码记为SB;④对上述原始同步码进行BARKER码调制。 Original encoded byte sync code referred to as SB; ④ above BARKER original synchronization code modulation code. 选用7位BARKER码1110010,即将原始同步码扩展成7组,BARKER码中的'1'表示原始同步码不作任何改变,'0'表示原始同步码的每一位均相反。 7 BARKER selection code 1110010, i.e. the original preamble set extended to 7, BARKER code '1' means that the original preamble without any changes, '0' indicates an opposite each bit of the original preamble. 最后得到SB1、 SB2、 SB3、 /SB4、 /SB5、 SB6、 /SB7并存入RAM 。 Finally obtained SB1, SB2, SB3, / SB4, / SB5, SB6, / SB7 and stored in RAM. 其中SB1 、 SB2、 SB3、 SB6完全相同,/SB4 、 /SB5、 /SB7完全相同,7,代表是反码。 Wherein SB1, SB2, SB3, SB6 are identical, / SB4, / SB5, / SB7 identical, 7, representatives are inverted. ⑤利用基带时钟信号将SB1、 SB2、 SB3、 /SB4、 /SB5、 /SB6、 /SB7顺序发送出去,同时CPU内部定时每隔2秒重复发送工作。 ⑤ base band clock signal SB1, SB2, SB3, / SB4, / SB5, / SB6, / SB7 transmitted sequentially, while the internal timing of CPU work repeatedly transmitted every 2 seconds.

接收是按如下步骤进行:接收端事先知道3字节同步头SH1、 SH2、 SH3。 Receiving is as follows: the receiving end know in advance that the synchronization header of 3 bytes SH1, SH2, SH3. ①通过对收到的信号按位进行7取4大数判决,大于等于4判为1而小于4判为0,②与已知同步头逐位进行比较。 ① By received signal with bit 7 to take large numbers decision 4, 4 greater than or equal to 1 and less than 4 judgment judged as 0, ② against the known synchronization header bit by bit. 收到的信号需存入缓存之中,判一位移动一位,直到检测到同步头。 The received signal to be stored in the cache, sentenced to a mobile one, until after the sync head. ③同步头检测到后即检测BCH (31, 21) A,BCH (31, 21 ) B,也用收同步头的方法,判一位移一位。 ③ after detecting the synchronization detection BCH (31, 21) A, BCH (31, 21) B, also receive the synchronization header of the method, a displacement of a sentence. 在移动64次后即完成收消息密钥。 64 is completed after the mobile received the message key. ④对BCHG1, 21) A和BCH (31, 21) B进行BCH译码,译出消息密钥IKA 和1KB。 ④ to BCHG1, 21) A, and BCH (31, 21) B BCH-decoded and translated message key IKA 1KB.

所述后续密码同步保护按事先确定的次数限定是指在同步保护状态内,若连续三次发生收方在规定的时间内未收到同步头或收消息密钥有误时,才退出同步保护状态,重新搜索密码同步。 The subsequent crypto-sync protection defined by the number of times determined in advance in the synchronization protection refers to the state, if the recipient occurs three times in consecutive not received within a predetermined time or when the synchronization header of the received message is incorrect keys, it exits the synchronization protection state re-search password synchronization. 密码同步的帧结构在图4中已表示。 Password synchronization frame structure has been represented in FIG. 4.

本发明具有以下积极意义: The invention has a positive meaning:

1、 多种同步技术和纠错编码技术融合在一起,较好地解决了在无线信道的密码同步的高可靠性和抗干扰性。 1, a variety of synchronization and error correction coding technology together, can solve the high reliability and robustness in wireless channel password synchronization. 根据测算,超短波信道的平均误码率可以达到 According to estimates, the average bit error rate of the channel can be achieved ultrashort

5X1(T2,而本发明的设计己达能抗1X10'1。当误码率为1X1(T'时,同步概率达到96%以上。因此,本技术有充足的余量适应各种信道。该技术的实现对无线保密通信有重要的意义,特别在无线双工移动通信系统中有广阔的应用前景,对从根本上提升保密通信的质量,对促进国防通信事业的发展具有积极作用。 5X1 (T2, the design of the present invention can have anti 1X10'1. When the error rate 1X1 (T ', the probability of 96% or more synchronization. Thus, the present technology has a sufficient margin to adapt to the channel. This technique there are implementations of wireless secure communications is important, particularly broad application prospects in duplex wireless mobile communication system, to improve the quality of secure communications fundamentally, has a positive role in promoting the development of national defense communications industry.

2、 无须借助电台的任何同步信息,只需要利用电台的时钟即可完成密码同步,应用方便,易于推广。 2, without the aid of any synchronization information stations, radio stations only need to use the password synchronization clock to complete, easy to use, easy to spread.

附图说明 BRIEF DESCRIPTION

附图1是本发明密码发送过程方框示意图。 Figure 1 is a block diagram of password transmission process of the present invention. 附图2是本发明密码接收过程方框示意图。 Figure 2 is a schematic block code receiving process of the present invention. 附图3是本发明所说密码同步的帧结构示意图。 Figure 3 is a schematic view of the synchronous frame structure of the present invention said password. 附图4是本发明所说的实施例发送方式示意图。 4 is a schematic view of an embodiment of the present invention, said transmission scheme.

附图给出了本发明的实施例。 Accompanying drawings of embodiments of the present invention. 本实施例采用连续密码同步方式,每2秒同步一次。 This embodiment employs a continuous mode password synchronization, synchronization time every 2 seconds. 密码同步方案由MCS51汇编语言实现。 Password synchronization scheme by the MCS51 assembly language.

发端首先确定3字节同步头SH1 、SH2、 SH3;然后将5字节消息密钥(IK) 分成两组,每组20bit记为IKA和1KB ,分别将IKA和1KB末尾补一个'0' 构成21bit再分别进行BCH (31, 21)编码,记为BCH (31, 21) A和BCH (31, 21) B;缓存BUFi, i=l, 2,…11以字节为单位,将SH1、 SH2、 SH3 按字节分别存入缓存BUF1、 BUF2和BUF3,将BCH (31, 21) A按字节存入缓存BUF4、 BUF5、 BUF6和BUF7, BUF7的最末位填'0以补足8位,,将BCH (31, 21) B按字节存入缓存BUF8、 BUF9、 BUF10和BUFll, BUF11的最末位填'0'以补足8位,这样就完成11字节的同步码的原始编码记为SB。 First determine the originating synchronization header 3 bytes SH1, SH2, SH3; 5-byte message and the key (IK) into two groups referred to as IKA 20bit and 1KB, respectively, and at the end of the IKA 1KB fill a '0' form 21bit were then BCH (31, 21) code, referred to as a BCH (31, 21) A, and BCH (31, 21) B; buffer BUFi, i = l, 2, ... 11 bytes, the SH1, SH2, SH3 bytes are stored in the buffer BUF1, BUF2 and BUF3, the BCH (31, 21) a byte stored in the buffer BUF4, BUF5, BUF6 and last bit BUF7, BUF7 fill 'to make up 8 0 ,, the BCH (31, 21) B bytes into the cache BUF8, BUF9, BUF10 and BUFll, BUF11 fill the last bit '0' to make up 8, thus completing the 11 bytes originally encoded preamble denoted by SB.

对上述原始同步码进行BARKER码调制。 Above the original synchronization code BARKER code modulation. 选用7位BARKER码1110010, 即将原始同步码扩展成7组,BARKER码中的'1'表示原始同步码不作任何 7 BARKER selection code 1110010, i.e. the original preamble set extended to 7, BARKER code '1' means that the original preamble without any

改变,<0'表示原始同步码的每一位均相反。 Changes <0 'opposite to each bit represents the original preamble. 最后得到SB1、SB2、 SB3、 /SB4、 /SB5、 SB6、 /SB7并存入RAM 。 Finally obtained SB1, SB2, SB3, / SB4, / SB5, SB6, / SB7 and stored in RAM. 其中SB1、 SB2、 SB3、 SB6完全相同,/SB4 、 /SB5、 /SB7完全相同,V'代表是反码。 Wherein SB1, SB2, SB3, SB6 are identical, / SB4, / SB5, / SB7 identical, V 'representatives are inverted.

利用基带时钟信号将SB1、 SB2、 SB3、 /SB4、 /SB5、 /SB6、 /SB7顺序发送出去,同时CPU内部定时每隔2秒重复发送工作。 Base band clock signal SB1, SB2, SB3, / SB4, / SB5, / SB6, / SB7 transmitted sequentially, while the internal timing of CPU work repeatedly transmitted every 2 seconds.

接收端事先知道3字节同步头SH1、 SH2、 SH3。 Know in advance the receiving end synchronization header 3 bytes SH1, SH2, SH3. 通过对收到的信号按位进行7取4大数判决,大于等于4判为1而小于4判为0,并与已知同步头逐位进行比较。 Carried by the received signal to bit 74 of large numbers judgment judged greater than or equal to 1 and less than 4 4 0 is judged, and compared with the known synchronization header bit by bit. 收到的信号需存入缓存之中,判一位移一位,直到检测到同步头。 The received signal to be stored in the cache, a displacement of a sentence, until after the sync head.

同步头检测到后即检测BCH (31, 21) A,BCH (31, 21) B,也采用收同步头的方法,判一位移一位。 After detecting the synchronization detection BCH (31, 21) A, BCH (31, 21) B, also receive the synchronization header of the method, a displacement of a sentence. 在移动64次后即完成收消息密钥。 64 is completed after the mobile received the message key. 对BCH (31, 21) A和BCH (31, 21) B进行BCH译码,译出IKA和1KB。 Of BCH (31, 21) A, and BCH (31, 21) B BCH-decoded and translated IKA 1KB.

首次密码同步收到后即进入同步保护状态,在同步保护状内,若收方因干扰在规定的时间内未收到同步头或收消息密钥有误,仍按规定的时刻从密码序列中提取消息密钥进行密码算法处理,保持与发方的密码同步,只有当连续三次发生上述情况时,才退出同步保护状态,重新搜索密码同步。 Synchronization is received after entering the first password protection synchronization state, the synchronization protection in shape due to interference if the recipient does not receive an acknowledgment message or a synchronization header within a predetermined period of time the key is incorrect, based upon the predetermined code sequence from the time extract the message key cryptographic algorithm processing to keep up with the sender's password synchronization, only when three consecutive occurrence of the above situation, only to exit the synchronization protection status, password synchronization search again. 本发明可用于多种无线通信系统的保密设备中。 The present invention can be used in a security device in various wireless communication systems. 从图3可看出在加密数据或话音时可采用密码同步和加 As can be seen from Figure 3 can be employed when encrypting data or voice password synchronization and processing

密信息交替发送的方式,另外,它还可以扩展使用,例如作为无线信道的信令发送方案,其中同步头不变,用信令数据替代消息密钥(IK)进行编码和发送。 Cipher information transmitted in an alternating manner, Furthermore, it can be extended, for example a signaling transmission scheme as a radio channel, wherein the synchronization header unchanged, encodes and transmits a substitute message key (IK) using the signaling data. for

了保证接收的可靠性,对于同一信令可采用重复发送的方式,收端任收一次即可。 Guarantee the reliability of reception, the signaling may be used for the same manner repeatedly transmitted, any terminating close once.

Claims (4)

1、一种移动通信密码同步的方法,采用连续密码同步方式,每2秒同步一次,由同步码编码、调制、发送;同步码接收和后续密码同步保护步骤共同完成,其特征在于:所述同步码的编码、调制、发送是指同步码包含11字节的同步信息,在确定同步头、产生消息密钥、将消息密钥分成两细,将分组后的消息密钥进行BCH编码,得到BCH(31,21)A和BCH(31,21)B;组成原始同步码后,将原始同步码用BARKER码进行调制、扩展后定时发送;所述同步码的接收是指对接收信息按位进行大数判决,得到正确的BCH(31,21)A和BCH(31,21)B;最后经过BCH解码译出收端所需的消息密钥;所述后续密码同步保护是指收端首次密码同步收到后,即进入同步保护状态,在此状态下,按事先确定的未收到同步头或收消息密钥有误的次数限定,在限定的范围内仍按规定的时刻从密码序列中提 1. A method of synchronizing a mobile communications password, password synchronization continuous manner, once every 2 seconds synchronization, the synchronization code encoding, modulation, transmission; preamble receiving step and a subsequent password protected together to complete synchronization, characterized in that: said synchronization code encoding, modulation, transmission means 11 comprise synchronization information byte code, the synchronization header is determined, generating a message key, the key is divided into two small message, the message key BCH coding the packet, to obtain BCH (31,21) a and BCH (31,21) B; post-amble of the original composition, the original modulated with BARKER preamble code transmission timing of the extension; receiving said synchronization code means for receiving information bit decision for large numbers to obtain the correct BCH (31,21) a and BCH (31,21) B; and finally through the BCH decoding key needed to decode the message receiving side; the subsequent synchronization password protection means first terminating after receipt of the password synchronization timing, i.e., to a synchronous protection state, in this state, according to pre-determined synchronization header is not received or the received message defines the number of bad key, based upon the predetermined range defined in the coding sequence from mention in 消息密钥进行密码算法处理,超过限定的次数后收端退出同步保护状态重新搜索密码同步。 Message key cryptographic algorithm processing, the number of times exceeds a defined exit terminating the synchronization protection password synchronization search state again.
2、 如权利要求1所述的移动通信密码同步的方法,其特征在于:所述同步码的编码、调制、发送具有以下步骤;①首先确定3字节同步头SH1、 SH2、 SH3; ②将5字节消息密钥(IK)分成两组,每组20bit,记为IKA和1KB,分别将IKA 和IKB末尾补一个'0'构成21bit ,再分别进行BCHG1, 21)编码,记为BCH(31, 21) A和BCH (31, 21) B;③缓存BUFi , i=l,2, ...11以字节为单位, 将SH1、 SH2、 SH3按字节分别存入缓存BUF1、 BUF2和BUF3,将BCH (31, 21) A按字节存入缓存BUF4、 BUF5、 BUF6和BUF7, BUF7的最低末位填"0"以补足8位,将BCH (31, 21) B按字节存入缓存BUF8、 BUF9、 BUF10 和BUFll, BUF11的最末位填'0,以补足8位,完成11字节的同步码的原始编码记为SB;④对上述原始同步码进行7位BARKER码1110010调制,扩展为7组:⑤利用基带时钟信号将SB1、 SB2、 SB3、 /SB4 、 /SB5、 /SB6、 /SB7顺序发送出去,同时CPU内部定时 2. The method of claim 1, the mobile communication password synchronization claims, wherein: said synchronization code encoding, modulation, transmission having the following steps; ① 3-byte synchronization header is first determined SH1, SH2, SH3; ② the 5-byte message key (IK) is divided into two groups 20bit, and referred to as IKA 1KB, respectively, and at the end of IKB IKA fill a '0' form 21bit, then were BCHG1, 21) code, referred to as a BCH ( 31, 21) A, and BCH (31, 21) B; ③ cache BUFi, i = l, 2, ... 11 bytes, the SH1, SH2, SH3 bytes are stored in the buffer BUF1, BUF2 and BUF3, the BCH (31, 21) a byte stored in the buffer BUF4, BUF5, BUF6 and minimum last one BUF7, BUF7 fill "0" to complement 8, the BCH (31, 21) B byte cached BUF8, BUF9, BUF10 and BUFll, BUF11 fill the last bit of '0, 8 to make up, to complete the originally encoded 11-byte sync code referred to as SB; ④ the synchronization code of said original code 7 BARKER 1110010 modulation, spreading seven groups: ⑤ base band clock signal SB1, SB2, SB3, / SB4, / SB5, / SB6, / SB7 transmitted sequentially, while the CPU internal timer 隔2秒重复发送工作。 2- second work repeatedly transmitted.
3、 如权利要求1所述的移动通信密码同步的方法,其特征在于:所述接收是按如下步骤进行①接收端事先知道3字节同步头SH1、 SH2、 SH3 ,通过对收到的信号按位进行7取4大数判决,大于等于4判为1而小于4判为0,②与已知同步头逐位进行比较,收到的信号需存入缓存之中,判一位移动一位,直到检测到同步头,③同步头检测到后即检测BCH (31, 21) A,BCH (31, 21) B, 也采用收同步头的方法,判位移位,在移动64次后即完成收消息密钥,©对BCH(31, 21) A和BCH (31, 21) B进行BCH译码,译出消息密钥IKA和1KB。 3. The method of claim 1, the mobile communication password synchronization claims, characterized in that: said receiver side receiving ① is known in advance as follows 3-byte synchronization header SH1, SH2, SH3, the signal received by the 7 bitwise decision taken large numbers 4, 4 greater than or equal to 1 and less than 4 judgment judged as 0, ② against the known synchronization header bit by bit, the received signal is stored in the cache need, a sentence a mobile after the position until after the synchronization header, the synchronization detection ③ upon detection of BCH (31, 21) a, BCH (31, 21) B, the method also received synchronization header, bit shift determination, the mobile 64 complete received message key, © of BCH (31, 21) A, and BCH (31, 21) B BCH-decoded and translated message key IKA 1KB.
4、 如权利要求1所述的移动通信密码同步的方法,其特征在于:所述后续密码同步保护按事先确定的次数限定是指在同步保护状态内,若连续三次发生收方在规定的时间内未收到同歩头或收消息密钥有误时,才退出同步保护状态,重新搜索密码同步。 If three consecutive time occurs subsequent recipient of the password in a predetermined number of times determined in advance by the synchronization protection is defined in the synchronization protection refers to the state: 4. The method of claim 1, the mobile communication password synchronization claims, characterized in that not received within the same ho head or receive a message key is incorrect, only exit the synchronization protection status, password synchronization search again.
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