CN101466144A - Three-dimensional space-time combined encrypt communication apparatus based on GNSS and communication method thereof - Google Patents
Three-dimensional space-time combined encrypt communication apparatus based on GNSS and communication method thereof Download PDFInfo
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Abstract
Disclosed are a space-time comprehensive encrypted communication device and a communication method thereof based on the GNSS, which belong to the communication technology field. A sending terminal firstly determines the space area where the sending terminal is positioned, queries an area key comparison table to obtain the area key, and generates the time key according to the sending time; a communication key is generated by integrating the area key with the time key, and then the sent clear text is encrypted by utilizing the communication key. A receiving terminal can query the area key comparison table to obtain the area key by identifying the area serial number added at the cryptograph head part by the sending terminal, and can obtain the time key according to the current time; the communication key is obtained by integrating the area key with the time key; and the reverse decryption is carried out on the cryptograph. The communication key can be dynamically changed along with the changes of the space area and the time of the sending terminal in the encrypted communication method; and the regional division scale can be randomly regulated along with the size of the whole communication area. The method is simple and is realized easily, thus greatly increasing the flexibility, the security and the decryption resistance of the encryption communication.
Description
Technical field
The present invention relates to a kind of three-dimensional space-time combined encrypt communication apparatus and communication means thereof, belong to GNSS navigator fix communication technical field based on GNSS.
Background technology
GNSS (GLONASS (Global Navigation Satellite System)) is the mensuration system of a global position and time, is the general name of countries in the world GPS (Global Position System).At present, GNSS has comprised the GNSS of the U.S., Muscovite GLONASS, the BD2 of China and the Galileo system of European Union.The GNSS system can provide accurate navigation locating function, has the ability of global satellite mobile communication again simultaneously, has the dual-use function of communication and navigator fix.At present the GNSS system is with its high accuracy, high efficiency with advantage has been widely used in aircraft navigation, missile guidance, ship Real-Time Scheduling and navigation, automobile navigation and traffic administration, communication, exploration is surveyed and drawn cheaply, good economic benefit and social benefit have been obtained in field such as engineering construction, weather monitoring in worldwide.GNSS signal observation station earthward provides correct time information and accurate localization information (positioning accuracy is better than 20 meters).In addition, the GNSS signal provides the pulse per second (PPS) square-wave signal of fixed cycle simultaneously, and its rising edge precision can reach nanometer second, utilizes it can make the relative satellite with receiving terminal of transmitting terminal of GNSS navigation system obtain temporal information simultaneously and reach precise synchronization.TDMA utilizes GNSS to carry out a kind of multiple access technology of radio communication just, its principle is that the time is divided into periodic frame, each frame is divided into several slots again to base station transmit signals, under regularly satisfied and synchronous condition, the base station can receive the signal of each portable terminal respectively and not mix and disturb in each time slot.Simultaneously, the signal that the base station is sent to a plurality of portable terminals all is arranged in order in the predetermined time slot and transmits, and each portable terminal just can be issued its signal distinguishing and receive by handle in close the signal on road as long as receive in the time slot of appointment.
For the user provides safe and reliable secure communication mechanism is most important content in the communication.Data encryption technology is the key technology that solves information network security; for protected data is not eavesdropped or is revised in transmittance process; must encrypt data; even data are stolen; because having key, the stealer it can't be reduced into expressly; thereby guaranteed safety of data, therefore the recipient can be reduced into ciphertext correct plaintext because of correct key is arranged.According to the key difference, the modern encryption system mainly contains two classes: conventional secret key cipher system (claim not only symmetric key cipher system) and public-key encryptosystem (but also claiming the asymmetric key cipher system).Public-key encryptosystem uses different encryption key and decruption key, encryption key is open, the people is only to be known decruption key by deciphering, there is not cipher key management considerations in public key cryptography, but it realizes the mathematics difficult problem based on the tip, calculate very complexity, and encryption/decryption speed can not show a candle to conventional secret key cipher system.In conventional secret key cipher system, it is identical with the key that is used to decipher to be used for encrypted secret key, and the cryptographic algorithm of use is easier, efficient, and key is brief, decodes extremely difficult.Conventional secret key cipher system is foremost to be Data Encryption Standard DES, AES and European data encryption standard IDEA.In these password standards, communicating pair was appointed employed key before setting up safe lane, before sending, receiving data, must finish the distribution of key, so the distribution of key has become the weakest, link that risk is maximum in this encryption system.For good symmetric encipherment algorithm, its fail safe is decided by the safety of key fully, and algorithm itself is can be disclosed, in case therefore the key leakage just equals to have leaked encrypted information.The confidentiality of reinforcement symmetric cryptographic key and the reliability of cipher key transmitting process are significant in conventional secret key cipher system.
Based on the global coverage property of GNSS, round-the-clock automation service characteristic and its high precision time information and locating information, at the spatially distributed communication system of GNSS, we propose a kind of three-dimensional space-time combined encrypt communication means based on GNSS, are particularly useful for the TDMA wireless communication system based on GNSS.This method adopts conventional secret key cipher mechanism, at the characteristic of GNSS communication system, proposes a kind of new key generation method and transmission method, has effectively strengthened the confidentiality and the transmission reliability of key.This method is customized to the basis with communication space area dividing and periodicity time frame, and transmitting terminal is encrypted the key that adopts to data and combined by space S sign indicating number and time T sign indicating number two parts.The residing area of space of the corresponding transmitting terminal of space S sign indicating number, the initial moment decision of time frame that the time T sign indicating number is then sent by data, transmitting terminal is to after expressly carrying out encryption, zone number is added on the ciphertext head, receiving terminal is searched " the region S sign indicating number table of comparisons " according to zone number and is obtained the region S sign indicating number, and the time T sign indicating number is then obtained by receiving terminal immediately based on the time synchronized of GNSS.The recipient obtains key according to same procedure combination S sign indicating number and T sign indicating number, and data are carried out reverse deciphering.In this encryption communication method, key dynamically changes with the variation of the area of space at transmitting terminal place and data transmitting time; The time T sign indicating number can obtain by both party immediately, and the S sign indicating number is numbered by transmission region, is obtained by receiving terminal contrast form, and combination obtains communication key through time slot scrambling again; Adopt block cipher system, can implement multiple encryption algorithms based on the key of regular length; Whole ciphering process has strengthened confidentiality, fail safe and the reliability of communication greatly.
Summary of the invention
The object of the present invention is to provide a kind of three-dimensional space-time combined encrypt communication apparatus and communication means thereof based on GNSS.
A kind of three-dimensional space-time combined encrypt communication apparatus based on GNSS comprises dispensing device and receiving system, wireless connections between dispensing device and the receiving system; Dispensing device obtains functional module, microprocessor module, encryption function module, ciphertext systematic function module and TDMA sending module by GNSS receiver module, transmitting terminal key to be formed, and receiving system obtains functional module, microprocessor module and decrypt ciphertext functional module by TDMA receiver module, receiving terminal key and forms.
This encryption method is customized to the basis with spatial division and periodicity time frame.On the space, communication zone is carried out area dividing according to earth longitude and latitude and spatial altitude, for each subregion is numbered and serves as according to for each zone different region S sign indicating numbers being set with the space coordinates of regional location representative, the GNSS communicating pair is held " the region S sign indicating number table of comparisons " simultaneously.On time, receiving-transmitting sides proofread and correct based on the GNSS deadline and synchronous basis on, the periodicity time frame of collaborative custom communication system, and regulation when data are sent the initial moment of residing time frame as the time T sign indicating number.In communication process, data sending terminal obtains corresponding S sign indicating number according to the zone at accurate latitude and longitude information judgement self place of GNSS signal; According to the residing time frame of current time cycle acquisition time T sign indicating number.Generate communication key by S sign indicating number and T code combination.Transmitting terminal utilizes this key to encrypt sending data, and in ciphertext head Adding Area numbering, ciphertext is sent to receiving terminal.After receiving terminal is received data, at first take off the zone number byte of ciphertext head, obtain the S sign indicating number according to " the region S sign indicating number table of comparisons ", the initial moment that obtains frame period current time then voluntarily is as the T sign indicating number, press principle of identity with the synthetic key of S sign indicating number and T code character after, utilize this key that enciphered data is decrypted, obtain original plaintext.Communication key dynamically changes with residing area of space of transmitting terminal and transmit frame cycle in this method, packet is encrypted the overhead that needs few (only needing the Adding Area numbering), the spatial division yardstick can be with the size adjustment in whole space, and data transmitting period can be as the case may be by the collaborative customization of communicating pair.Rich and varied in addition cryptographic algorithm makes encryption fully possess flexibility and anti-cracking, has strengthened the confidentiality and the fail safe of communication process greatly.
A kind of three-dimensional space-time combined encrypt communication means based on GNSS is characterized in that, may further comprise the steps:
(1) area of space is carried out subregion according to earth longitude and latitude and spatial altitude and also be partition number;
(2) in each subregion chosen area position representative, generate the region S sign indicating number, set up by " the region S sign indicating number table of comparisons " according to its coordinate information;
(3) cycle of communicating pair appointment data transmission, rise time T sign indicating number;
(4) transmitting terminal is according to latitude and longitude information and elevation information that the GNSS signal provides, judges the area of space at self place, obtains the region S sign indicating number;
(5) transmitting terminal is judged the present located time frame cycle according to temporal information, obtains key time T sign indicating number;
(6) transmitting terminal is taked add operation to region S sign indicating number and time T sign indicating number, with operation result as key;
(7) transmitting terminal uses key that data are encrypted, and adds partition number at the packet head, forms ciphertext to be sent;
(8) transmitting terminal sends to receiving terminal with ciphertext through wireless mode;
(9) receiving terminal obtains the region S sign indicating number according to ciphertext head zone numbering, obtains the T sign indicating number according to the current time;
(10) receiving terminal adopts the key generation method identical with transmitting terminal to be combined into key, and utilizes key that enciphered data is decrypted, and obtains original plaintext;
(11) the space-time block encryption decrypt communication process based on GNSS finishes.
Characteristics of the present invention are:
1, this encryption communication method makes full use of characteristics such as the high accuracy of GNSS signal, round-the-clock, wide distribution, has the characteristics of reliability, real-time and stability.
2, key changes with the variation of space, transmitting terminal place and data transmitting time, has real-time, dynamic.
3, area dividing yardstick freedom, the time frame cycle has very strong flexibility by the collaborative customization of receiving-transmitting sides.
4, with spatial information as the S sign indicating number, temporal information is as the T sign indicating number, the S sign indicating number adopts the table mapping method to safeguard that the T sign indicating number has improved confidentiality, the fail safe of key greatly by the receiving-transmitting sides synchronization gain.
5, the simple and effective characteristic that possesses symmetric cryptography.
6, Fu diversified cryptographic algorithm effectively increases the robustness of encryption method, anti-cracking and anti-tampering property.
7, this method is particularly useful for the tdma communication system based on GNSS.
Description of drawings
Fig. 1 is a software flow pattern of the present invention.
Fig. 2 is that the region S sign indicating number is formed schematic diagram among the present invention.
Fig. 3 is the region S sign indicating number table of comparisons among the present invention.
Fig. 4 is a communication key generation method schematic diagram among the present invention.
Fig. 5 is based on the cryptographic algorithm schematic diagram of key among the present invention.
Fig. 6 is an apparatus structure block diagram among the present invention.
Wherein, 1, GNSS receiver module; 2, the transmitting terminal key obtains functional module; 3, microprocessor module; 4, encryption function module; 5, ciphertext systematic function module; 6, TDMA sending module; 7, dispensing device; 8, wireless channel; 9, TDMA receiver module; 10, the receiving terminal key obtains functional module; 11, decrypt ciphertext functional module; 12, receiving system.
Embodiment
Embodiment:
A kind of three-dimensional space-time combined encrypt communication apparatus based on GNSS as shown in Figure 6, comprises dispensing device 7 and receiving system 12, wireless connections between dispensing device 7 and the receiving system 12; Dispensing device 7 obtains functional module 2, microprocessor module 3, encryption function module 4, ciphertext systematic function module 5 and TDMA sending module 6 by GNSS receiver module 1, transmitting terminal key to be formed, and receiving system 12 obtains functional module 10, microprocessor module 3 and decrypt ciphertext functional module 11 by TDMA receiver module 9, receiving terminal key and forms.
A kind of three-dimensional space-time combined encrypt communication means based on GNSS as shown in Figure 1, may further comprise the steps:
(1) area of space is carried out subregion according to earth longitude and latitude and spatial altitude and also be partition number;
Suppose and use its communication range of communication system of GNSS to contain the whole earth, then will carry out area dividing at three dimensions the whole earth.According to existing aircraft flight height situation: some light aerocrafts can fly on liftoff tens meters height, the aircraft in short course line is generally 6000 meters to 9600 meters flights, the aircraft in long course line is generally 8000 meters to 12600 meters flights, the present the highest flying height of common airline carriers of passengers can be above 12600 meters, have the flying height of some business airplanes can reach 15000 meters, the ceiling altitude of modern fighter plane of being on active service is about 20000 meters.Division methods can be on longitude and latitude is initial border with the first meridian and equator, in height cover 0 to 20000 meter height layer, with longitude 20 degree, latitude 10 degree are distinguished 18 five equilibriums with the whole world at longitude and latitude direction as span, with the height 1000 meters as span with height layer 20 five equilibriums, delimit 18*18*20 totally 6480 zones, then these 6480 zones be numbered from 1 to 6480.During subregion, determine that every border is only comprised by a zone.As number the scope that 0001 zone comprises and be: north latitude 0-10 degree, east longitude 0-20 degree is between the height 0-1000 rice; The scope that the zone of numbering 0002 comprises is: north latitude 0-10 degree, and east longitude 0-20 degree is between the height 1000-2000 rice; , the scope that the zone of numbering 0020 comprises is: north latitude 0-10 degree, and east longitude 0-20 degree is between the height 19000-20000 rice; The scope that the zone of numbering 0021 comprises is: north latitude 10-20 degree, and east longitude 0-20 degree, between the height 0-1000 rice, the rest may be inferred
(2) in each subregion chosen area position representative, generate the region S sign indicating number, set up the region S sign indicating number table of comparisons according to its spatial information;
In each subregion, we stipulate that east longitude, north latitude direction use " 1 " expression respectively, and west longitude, south latitude direction are used " 0 " expression respectively, and the center that can select each area of space is as the regional location representative in this district.In 0001 zone, select north latitude 5 degree, east longitude 10 degree, the position that height is 500 meters is the representative of area of space position.A latitude information round numbers part is represented (as " 05 ") with double figures, a longitude information round numbers is partly represented (as " 010 ") with three figure places, elevation information with 01-20 represent respectively 500 meters, 1500 meters ..., 19500 meters height, the spatial information of 0001 regional location representative is expressed as " 105101001 " the most at last, makes it as this region S sign indicating number.The visibility region key is made of 9 bit digital, its constituted mode as shown in Figure 2, the height of low two bit representation regional locations representative, the longitude integer part of the 3rd to five bit representation regional location representative, the 6th bit flag west longitude (0)/east longitude (1), the latitude integer part of the seven or eight bit representation regional location representative, highest order sign south latitude (0)/north latitude (1).
Finally, set up the region S sign indicating number table of comparisons as shown in Figure 3 for all subregions, so that GNSS transmitting terminal and receiving terminal are inquired about corresponding S sign indicating number according to zone number, this table is held simultaneously by receiving-transmitting sides;
(3) cycle of communicating pair appointment data transmission, rise time T sign indicating number;
If time frame Cycle Length of communicating pair regulation is 30 seconds, is divided into 60 time slots altogether, each time slot is 50ms; With on January 1st, 2008 during 00:00:00 as the initiation of communication time, then the residing initial moment in time frame cycle of 08:49:45 on May 26th, 2008 should be 08:49:30 on May 26th, 2008, and we get numeral " 084930 " in the temporal information as the time T sign indicating number;
(4) transmitting terminal is according to latitude and longitude information in the GNSS signal and elevation information, judges the area of space at self place, obtains the region S sign indicating number;
If certain transmitting terminal is learnt longitude and latitude of oneself and elevation information and is respectively 2300 meters of 8 ° of 30 ' 00 ＂ N, 16 ° of 30 ' 00 ＂ E, height from the GNSS signal, then can judge self to be in 0003 zone, from the region keys table of comparisons, obtain this region keys and be " 105101003 ";
(5) transmitting terminal is judged the present located time frame cycle according to temporal information, obtains key time T sign indicating number;
If the data current time is 09:44:10 on May 26th, 2008, then knows that by step (3) current transmission cycle zero-time is 09:44:00, obtains the time T sign indicating number and be " 094400 ";
(6) transmitting terminal is taked add operation to region S sign indicating number and time T sign indicating number, with operation result as key;
The region S sign indicating number is 9 integers, the time T sign indicating number is 6 integers, because the highest order of region S sign indicating number can only be 1 or 0, the highest order of time T sign indicating number can only be 0 or 1 or 2, so two numbers are carried out add operation, can not produce carry, can guarantee result of calculation 9 integers always, and but add operation is inverse operation, also is convenient to receiving terminal and carries out reverse computing.Still region S sign indicating number and time T sign indicating number are taked add operation, as key, key generative process example is seen Fig. 4 with operation result, transmitting terminal obtains communication key for " 105195403 " according to above-mentioned key generation method;
(7) transmitting terminal uses key that data are encrypted, and adds partition number at the packet head, forms ciphertext to be sent;
Next be to utilize the key that generates to encrypt to sending data, we will send data and be one group with 9 bytes and divide into groups, then each byte in the grouping is carried out the operation of cyclic shift according to the numerical value of the corresponding position of key, the grouping of less than 9 bytes is handled according to the mode of low byte in the grouping of key low level corresponding data; Specific implementation is as shown in Figure 5: the data that transmitting terminal will send in advance are that a component is some groups with 9 bytes, region keys is from front to back each byte in the corresponding respectively grouping of each in 9 from high to low, forward byte is a high byte in the order grouping, byte after leaning on is a low byte, has promptly finished the mapping of high byte in the high-order corresponding grouping in the key; Self ring shift right figure place that numerical value on the key corresponding positions has determined that corresponding byte will carry out.In Fig. 5, key the 2nd bit value is 3, byte 2 in the corresponding grouping, and then the 8bit number in the byte 2 will self ring shift right 3, and other byte is carried out same treatment.In the packet head Adding Area numbering of having encrypted, the byte number of expression zone number if having 6480 zones, then needs 2 bytes to represent zone number by the sum decision of subregion at last.Just generated last ciphertext after having added zone number.Transmitting terminal utilizes key " 105195403 " to adopt above-mentioned cryptographic algorithm that data are encrypted, and adds two byte representation zone numbers 0003 at the ciphertext head, generates the ciphertext that finally will transmit;
(8) transmitting terminal sends to receiving terminal with ciphertext through wireless mode;
(9) receiving terminal obtains the region S sign indicating number according to receiving the ciphertext head zone information of data, obtains the T sign indicating number according to the current time;
Receiving terminal takes off the two byte area numbering of ciphertext head earlier, and identified region is numbered " 0003 ", checks in the key " 105101003 " of this zone correspondence then from the region keys table of comparisons; Because sending time slots and receiving slot are always at a time frame in the cycle, so the T sign indicating number certainty that receiving terminal obtained according to the current time is consistent with the T sign indicating number of transmitting terminal, the time T sign indicating number is " 094400 ";
(10) receiving terminal adopts the key generation method identical with transmitting terminal to be combined into key, and utilizes key that enciphered data is decrypted, and obtains original plaintext;
(11) the space-time combined ciphering decrypt communication process based on GNSS finishes.
Claims (2)
1, a kind of three-dimensional space-time combined encrypt communication apparatus based on GNSS is characterized in that, comprises dispensing device and receiving system, wireless connections between dispensing device and the receiving system; Dispensing device obtains functional module, microprocessor module, encryption function module, ciphertext systematic function module and TDMA sending module by GNSS receiver module, transmitting terminal key to be formed, and receiving system obtains functional module, microprocessor module and decrypt ciphertext functional module by TDMA receiver module, receiving terminal key and forms.
2, the communication means of the described three-dimensional space-time combined encrypt communication apparatus based on GNSS of a kind of claim 1 is characterized in that, may further comprise the steps:
(1) area of space is carried out subregion according to earth longitude and latitude and spatial altitude and also be partition number;
(2) in each subregion chosen area position representative, generate the region S sign indicating number, set up by " the region S sign indicating number table of comparisons " according to its coordinate information;
(3) cycle of communicating pair appointment data transmission, rise time T sign indicating number;
(4) transmitting terminal is according to latitude and longitude information and elevation information that the GNSS signal provides, judges the area of space at self place, obtains the region S sign indicating number;
(5) transmitting terminal is judged the present located time frame cycle according to temporal information, obtains key time T sign indicating number;
(6) transmitting terminal is taked add operation to region S sign indicating number and time T sign indicating number, with operation result as key;
(7) transmitting terminal uses key that data are encrypted, and adds partition number at the packet head, forms ciphertext to be sent;
(8) transmitting terminal sends to receiving terminal with ciphertext through wireless mode;
(9) receiving terminal obtains the region S sign indicating number according to ciphertext head zone numbering, obtains the T sign indicating number according to the current time;
(10) receiving terminal adopts the key generation method identical with transmitting terminal to be combined into key, and utilizes key that enciphered data is decrypted, and obtains original plaintext;
(11) the space-time block encryption decrypt communication process based on GNSS finishes.
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| CN108718300A (en) * | 2018-05-04 | 2018-10-30 | 湖南省测绘科技研究所 | A kind of online encryption transmission system of GNSS data and method |
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| CN108718300B (en) * | 2018-05-04 | 2021-07-02 | 湖南省测绘科技研究所 | GNSS data online encryption transmission system and method |
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| CN113785254A (en) * | 2019-05-08 | 2021-12-10 | 日立建机株式会社 | Vehicle control system |
| CN113824552A (en) * | 2020-06-19 | 2021-12-21 | 上海汽车集团股份有限公司 | Key generation method and device for vehicle application program and electronic equipment |
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