CN101938740A - Information issuing method and system for earthquake tsunami alarm system - Google Patents
Information issuing method and system for earthquake tsunami alarm system Download PDFInfo
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- CN101938740A CN101938740A CN2009100884800A CN200910088480A CN101938740A CN 101938740 A CN101938740 A CN 101938740A CN 2009100884800 A CN2009100884800 A CN 2009100884800A CN 200910088480 A CN200910088480 A CN 200910088480A CN 101938740 A CN101938740 A CN 101938740A
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- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000012795 verification Methods 0.000 claims abstract description 84
- 238000012423 maintenance Methods 0.000 claims description 21
- 238000012790 confirmation Methods 0.000 claims description 15
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- 238000012544 monitoring process Methods 0.000 claims description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/10—Integrity
- H04W12/106—Packet or message integrity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
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Abstract
The invention discloses an information issuing method for an earthquake tsunami alarm system, and the method comprises the following steps: leading a base station to send a public key for information verification key centering; leading a mobile terminal to receive the public key and store; leading the base station to use a private key for the information verification key centering to carry out digital signature on ETWS initial information, adding the ETWS initial information and the digital signature to a paging message and sending; and leading the mobile terminal to receive the paging message, verifying the ETWS initial information carried in the received paging message through the digital signature carried in the received paging message and the stored public key, and emitting a disaster alarm according to the verification result. The invention simultaneously discloses an information issuing system for the earthquake tsunami alarm system, which comprises the base station and the mobile terminal. The adoption of the method and the system can issue the ETWS information in a safe and timely manner.
Description
Technical Field
The invention relates to an Earthquake and Tsunami Warning System (ETWS), in particular to an ETWS information issuing method and System.
Background
ETWS is an alert system proposed by the third generation partnership project (3GPP) for natural disasters. The ETWS carries out natural disaster notification through the mobile communication network, and the ETWS has good application prospect because the mobile communication network almost covers the whole world and the popularization of mobile terminals.
Currently, there are several ways to publish ETWS information:
firstly, ETWS information is sent through a paging channel; the method has the advantages that the capacity of the paging channel is limited, the information quantity carried by a single paging message body cannot be too large, so that ETWS information carried by the paging message cannot be too large and only can comprise some brief information related to disasters;
secondly, ETWS information is sent through a broadcast channel; in the method, because the periodic time interval exists between the broadcast channel receiving and releasing messages, the real-time performance is poor, the time interval between the time when the disaster is detected and the actual occurrence time of the disaster is usually very short, especially the sudden natural disaster, and before the disaster occurs, the mobile terminals can not receive the ETWS information in time and can not play a role of alarming;
thirdly, ETWS information is sent through enhanced multimedia broadcast and multicast service (E-MBMS); due to the fact that the application of the E-MBMS is not wide enough at present, a large number of mobile terminal users which do not use the service can not be alarmed by the disaster.
In order to avoid the problems of the methods, a method of sending ETWS initial information through a paging channel and sending ETWS detailed information and verification information through a broadcast channel is often adopted at present, but the authenticity of the ETWS initial information sent by the paging channel in the method needs to be verified by the verification information of the broadcast channel, and people can take defensive measures at the first time of obtaining an alarm, and after receiving the verification information sent by the broadcast channel, false alarms can cause harm and disturb daily work and life of people; therefore, how to safely release the ETWS information and avoid the spreading of malicious and fake ETWS information is a problem which needs to be solved urgently by the ETWS at present.
Disclosure of Invention
In view of the above, the present invention is directed to an information distribution method and system for an earthquake and tsunami warning system, which can distribute ETWS information safely and timely.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an information issuing method of an earthquake and tsunami warning system comprises the steps that a base station sends a public key in an information verification key pair; the mobile terminal receives and stores the public key; the method further comprises the following steps:
the base station carries out digital signature on the ETWS initial information by using a private key in the information verification key pair, and adds the ETWS initial information and the digital signature to the paging message and sends the paging message;
and the mobile terminal verifies the ETWS initial information carried by the received paging message through the digital signature carried by the received paging message and the stored public key, and sends out a disaster alarm according to a verification result.
Further, the method further comprises: issuing the ETWS detailed information through a broadcast channel, which specifically comprises the following steps:
the base station broadcasts ETWS detailed information; the mobile terminal receives the ETWS detail information.
Further, the base station sends a public key in the information verification key pair; the mobile terminal receiving the public key and storing comprises:
the base station randomly selects a key pair from a key pair pool per se at set time intervals, and replaces the currently stored information verification key pair of the base station with the selected key pair;
when the initially selected cell is resident or cell switching is carried out, the base station sends a public key in the information verification key pair to the mobile terminal through the connection established in the bidirectional authentication process of the mobile terminal and the base station;
the mobile terminal replaces the public key stored therein with the received public key.
Further, before adding the ETWS initial information and the digital signature to the paging message and sending, the method further includes: adding the ETWS information identifier to the paging message, specifically:
adding an ETWS information identifier into a paging message as a first paging record of the paging message;
correspondingly, before verifying the ETWS initial information carried by the received paging message, the method includes: determining whether the paging message carries ETWS initial information and a digital signature, specifically:
checking whether a first paging record in the paging message is an ETWS information identifier or a device identifier, if the first paging record is the ETWS information identifier, and if the first paging record is the ETWS information identifier, the first paging record is considered to carry ETWS initial information and a digital signature, verifying the ETWS initial information carried by the received paging message, and then performing a paging process; if the paging message is the device identifier, the paging message is considered to not carry the ETWS initial information and the digital signature, and then a paging process is carried out.
Further, said digitally signing the ETWS initial information comprises:
the base station generates summary information for the ETWS initial information by adopting a Hash algorithm; encrypting the generated digest information by using a private key through an asymmetric encryption algorithm to obtain a digital signature;
the verifying the ETWS initial information carried by the received paging message and sending a disaster alert according to the verification result includes:
the mobile terminal decrypts the abstract information from the digital signature carried by the paging message by using the public key through an asymmetric decryption algorithm; the mobile terminal generates summary information for ETWS initial information carried by the paging message by adopting a Hash algorithm;
the mobile terminal compares whether the decrypted abstract information is the same as the generated abstract information, and if so, a disaster alarm is given; otherwise, the disaster warning is not issued.
Further, the method further comprises: according to the timestamp carried by the received paging message, verifying that the public key stored by the mobile terminal is not expired, specifically:
after the base station randomly selects the key pair from the key pair pool of the base station at set time intervals, the method further comprises the following steps: the base station replaces the timestamp stored currently by the current time;
correspondingly, when the base station sends the public key in the information verification key pair to the mobile terminal, the method further includes: the base station sends a timestamp stored currently to the mobile terminal;
after the mobile terminal uses the received public key to replace the public key stored by the mobile terminal, the method further comprises the following steps: the mobile terminal replaces the timestamp stored by the mobile terminal with the received timestamp;
before adding the ETWS initial information and the digital signature to the paging message and sending, the method further includes: adding a timestamp currently stored by a base station to the paging message;
before verifying the ETWS initial information carried by the received paging message, the method further includes: and if the time stamp carried by the paging message is the same as the time stamp stored by the mobile terminal, the public key stored by the mobile terminal is considered to be unexpired.
The invention also provides an information issuing system of the earthquake and tsunami warning system, which comprises: a base station and a mobile terminal; wherein,
the base station is used for sending a public key in the information verification key pair; the ETWS initial information is digitally signed by using a private key in an information verification key pair, and the ETWS initial information and the digital signature are added to the paging message and are sent;
the mobile terminal is used for receiving and storing the public key; and the ETWS system is used for receiving the paging message, verifying the ETWS initial information carried by the received paging message through the digital signature carried by the received paging message and the stored public key, and sending out a disaster alarm according to a verification result.
Further, the base station includes: the system comprises a key maintenance module, a digital signature module and a first information adding module; wherein,
the key maintenance module is used for randomly selecting a key pair from the key pair pool of the key maintenance module per se at set time intervals, and replacing the currently stored information verification key pair with the selected key pair; when the initially selected cell is resident or cell switching is carried out, a public key in the information verification key pair is sent to the mobile terminal through the connection established in the bidirectional authentication process of the mobile terminal and the base station;
the digital signature module is used for digitally signing the ETWS initial information by using a private key in the information verification key pair;
a first information adding module, configured to add the ETWS initial information and the digital signature to the paging message and send the paging message when it is monitored that the digital signature module completes digital signature on the ETWS initial information;
correspondingly, the mobile terminal comprises: the system comprises a key storage module and a digital signature verification module; wherein,
the key storage module is used for receiving the public key and replacing the public key stored by the key storage module by using the received public key;
and the digital signature verification module is used for receiving the paging message, verifying the ETWS initial information carried by the received paging message through the digital signature carried by the received paging message and the stored public key, and sending out a disaster alarm according to a verification result.
Further, the base station further includes:
a second information adding module, configured to add, when it is monitored that the digital signature module completes digital signature on the ETWS initial information, the ETWS information identifier as a first paging record of the paging message to the paging message;
correspondingly, the mobile terminal further comprises: the device comprises an information confirmation module and a paging module; wherein,
an information confirmation module, configured to check whether a first paging record of a paging record group in the paging message received by the digital signature verification module is an ETWS information identifier or a device identifier, and instruct the digital signature verification module to verify ETWS initial information when a check result is the ETWS information identifier; when the checking result is the equipment identifier, indicating a paging module to perform a paging process;
and the paging module is used for monitoring the digital signature verification module and performing a paging process when the digital signature verification module is monitored to finish the verification of the ETWS initial information or an instruction of the information confirmation module is received.
Further, the system further comprises:
the time limit confirmation module is used for verifying that the public key stored by the time limit confirmation module is not expired according to the time stamp carried by the received paging message;
specifically, the deadline confirming module comprises a timestamp maintenance module and a third information adding module which are arranged on the base station, and a timestamp storage module and a determining module which are arranged on the mobile terminal; wherein,
the timestamp maintenance module is used for replacing the timestamp stored currently by the current time when the key maintenance module is monitored to replace the currently stored information verification key pair, and sending the timestamp stored currently to the timestamp storage module;
a third information adding module, configured to add a timestamp currently stored by the timestamp maintenance module to the paging message when it is monitored that the digital signature module completes digital signature on the ETWS initial information;
the timestamp storage module is used for replacing the timestamp stored by the timestamp storage module with the received timestamp;
and the determining module is used for determining that the time stamp carried by the paging message received by the digital signature verifying module is the same as the time stamp stored by the mobile terminal, considering that the public key stored by the mobile terminal is not expired, and sending the determining result to the digital signature verifying module.
According to the information issuing method and system for the earthquake and tsunami warning system, digital signature and digital signature verification are carried out on the ETWS initial information, so that the ETWS information is issued safely and timely. The invention also has the following advantages and characteristics:
1. each base station respectively maintains a key pair pool and an information verification key pair, so that the damage range of the malicious and false ETWS information is limited to the cell of the base station which is maliciously attacked, and the large-range damage caused by the malicious and false ETWS information can be effectively prevented; the information verification key pair is updated at set intervals, so that long-time damage caused by malicious and fake ETWS information can be prevented;
2. the mutual verification is carried out when the mobile terminal and the base station are connected, so that the connection established in the bidirectional authentication process of the mobile terminal and the base station is considered to be safe and reliable, and the public key can be safely transmitted through the connection;
3. after the ETWS initial information is subjected to Hash algorithm to generate summary information, the summary information is encrypted, so that the information quantity of a digital signature can be reduced, channel resources occupied by the digital signature are further reduced, and the decryption speed is increased;
4. the ETWS information identifier is used as a first paging record, when inquiring, whether the paging message carries the ETWS initial information and the digital signature or not can be determined through the first paging record, and then the paging process is carried out, so that the disaster warning speed is increased;
5. after the base station digitally encodes the disaster name and the disaster level included in the ETWS initial information, the base station digitally signs the code, so that the information amount borne by a paging channel when the ETWS initial information is issued is reduced, and the paging channel resource is saved;
6. and verifying that the public key stored in the mobile terminal is not expired through the timestamp so as to ensure that the expired public key is not used for digital signature verification and further ensure the correctness of a digital signature verification result.
Drawings
FIG. 1 is a flow chart of an implementation of an information distribution method of an earthquake and tsunami warning system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an information distribution system of an earthquake and tsunami warning system according to an embodiment of the present invention.
Detailed Description
The implementation flow of the information issuing method of the earthquake and tsunami warning system in the embodiment of the invention is shown in fig. 1, and comprises the following steps:
step 101: the base station sends a public key in the information verification key pair; the mobile terminal receives and stores the public key;
the public key in the information verification key pair sent by the base station is specifically:
the base station randomly selects a key pair from a key pair pool per se at set time intervals, and replaces the currently stored information verification key pair of the base station with the selected key pair;
and when the initially selected cell is resident or the cell is switched, the base station sends the public key in the information verification key pair to the mobile terminal through the connection established in the bidirectional authentication process of the mobile terminal and the base station.
Here, each base station respectively maintains its own key pair pool and information verification key pair, so that when a certain base station is maliciously attacked, the damage range of the maliciously attacked false ETWS information is limited to the cell of the maliciously attacked base station, and the large-range damage caused by the maliciously attacked false ETWS information can be effectively prevented; and the information verification key pair is updated at set time intervals, so that the damage time of the malicious fake ETWS information can be controlled within the set time, and the long-time damage caused by the malicious fake ETWS information can be prevented.
Wherein, the mobile terminal receives the public key and stores the public key specifically as follows: the mobile terminal replaces the public key stored therein with the received public key.
Here, since the mobile terminal and the base station are authenticated with each other when establishing a connection, it is considered that the connection established in the mutual authentication process of the mobile terminal and the base station is secure and reliable, and it is considered that the common key can be securely transmitted through the connection.
Step 102 a: the base station carries out digital signature on the ETWS initial information by using a private key in the information verification key pair, and adds the ETWS initial information and the digital signature to the paging message and sends the paging message;
wherein, the ETWS initial information comprises brief information such as disaster name, disaster level and the like;
here, the digital signature on the ETWS initial information specifically includes:
step A1, the base station generates summary information for the ETWS initial information by adopting a Hash algorithm;
step B1, the base station encrypts the generated abstract information by using a private key through an asymmetric encryption algorithm to obtain a digital signature;
after the initial ETWS information is subjected to Hash algorithm to generate the digest information, the digest information is encrypted, so that the information quantity of the digital signature can be reduced, channel resources occupied by the digital signature can be further reduced, and the decryption speed is improved.
Before adding the ETWS initial information and the digital signature to the paging message and sending, step 102 may further include: adding the ETWS information identifier to the paging message, specifically:
and adding the ETWS information identifier into the paging message as a first paging record of the paging message.
Here, a paging message includes a paging record group, a plurality of paging records may be added to a paging record group, and a paging record corresponds to a paging of a mobile terminal to which an equipment identifier included in the paging record belongs; after the mobile terminal receives the paging message, that is, starting from the first paging record, the mobile terminal queries each paging record in the paging record group one by one to determine whether the paging record group has the paging record containing the own device identifier, so that the ETWS information identifier is used as the first paging record, and when querying, the mobile terminal determines whether the paging message carries the ETWS initial information and the digital signature through the first paging record, and then performs the paging process, thereby accelerating the disaster warning speed.
Here, in order to reduce the amount of information carried by the paging channel when the ETWS initial information is released, the base station may digitally encode the disaster name, such as earthquake, tsunami, tornado, volcanic eruption, hail, debris flow, etc., and the disaster level included in the ETWS initial information, and then digitally sign the encoded disaster name, where the encoded format is a format recognizable by the mobile terminal, such as ASCII code.
Here, in order to ensure that each mobile terminal can receive the ETWS initial information, the paging message carrying the ETWS initial information and the digital signature may be repeatedly sent without interruption.
Step 103 a: and the mobile terminal verifies the ETWS initial information carried by the received paging message through the digital signature carried by the received paging message and the stored public key, and sends out a disaster alarm according to a verification result.
The verifying the ETWS initial information carried by the received paging message and sending out a disaster alert according to the verification result specifically includes:
the mobile terminal decrypts the abstract information from the digital signature carried by the paging message by using the public key through an asymmetric decryption algorithm; the mobile terminal generates summary information for ETWS initial information carried by the paging message by adopting a Hash algorithm;
the mobile terminal compares whether the decrypted summary information is the same as the generated summary information, if so, the ETWS initial information is considered to be real and complete, and a disaster warning is sent; otherwise, the initial ETWS information is considered as malicious and fake ETWS information or is maliciously tampered, and a disaster alarm is not sent out; wherein, the disaster alarm can be realized by ringing, displaying characters or figures and the like.
Here, before verifying the ETWS initial information carried in the received paging message, step 103a further includes: determining whether the paging message carries ETWS initial information and a digital signature, specifically:
checking whether a first paging record of a paging record group in a paging message is an ETWS information identifier or a device identifier, if the first paging record is the ETWS information identifier, and if the first paging record is the ETWS information identifier, the first paging record is considered to carry ETWS initial information and a digital signature in the paging message, verifying the ETWS initial information carried by the received paging message, and then performing a paging process; if the paging message is the device identifier, the paging message is considered to not carry the ETWS initial information and the digital signature, and then a paging process is carried out.
The paging process specifically includes:
the mobile terminal inquires whether a paging record group in the paging message contains a paging record containing a self equipment identifier, and if the paging record group in the paging message contains the paging record group, the mobile terminal establishes connection with the base station; if not, no connection is established with the base station.
The embodiment of the invention can also comprise: verifying whether a public key stored by the mobile terminal is expired or not according to a timestamp carried by the received paging message, and if not, executing a step 103 a; if so, step 104a is performed.
Verifying whether a public key stored by the mobile terminal is expired specifically as follows:
after the base station randomly selects a key pair from its own key pair pool at set time intervals, step 101 further includes: the base station replaces the timestamp stored currently by the current time;
when the base station sends the public key in the information verification key pair to the mobile terminal, step 101 further includes: the base station sends a timestamp stored currently to the mobile terminal;
after the mobile terminal uses the received public key to replace the public key stored by itself, step 101 further includes: the mobile terminal replaces the timestamp stored by the mobile terminal with the received timestamp;
before adding the ETWS initial information and the digital signature to the paging message and sending, step 102a further includes: adding a timestamp currently stored by a base station to the paging message;
before verifying the ETWS initial information carried by the received paging message, step 103a further includes determining that the timestamp carried by the paging message is the same as the timestamp stored by the mobile terminal itself, and if not, determining that the public key stored by the mobile terminal is expired.
Step 104 a: the mobile terminal establishes a secure link with the base station; the base station sends a public key and a timestamp in a currently stored verification key pair to the mobile terminal through the established secure link; the mobile terminal replaces the public key and the time stamp stored in itself with the received public key, and returns to step 103 a.
The method for establishing the secure link between the mobile terminal and the base station specifically comprises the following steps:
a mobile terminal initiates random access based on competition to a base station; after the random access is successful, the mobile terminal establishes RRC connection with the base station, namely the establishment of the security link is completed.
The embodiment of the invention can also comprise: issuing the ETWS detailed information through a broadcast channel, which specifically comprises the following steps:
step 102 b: the base station broadcasts ETWS detailed information;
the ETWS detailed information comprises information such as disaster occurrence places, how to save self and driving routes.
Here, in order to ensure that each mobile terminal can receive the ETWS detailed information, the ETWS detailed information may be repeatedly broadcast without interruption.
Step 103 b: the mobile terminal receives the broadcasted ETWS details.
In the embodiment of the present invention, when the disaster forecasting center monitors a disaster, steps 102a and 103a are executed, the ETWS initial information is issued through a paging channel, steps 102b and 103b are executed, and the ETWS detailed information is issued through a broadcast channel, wherein steps 102a and 102b can be executed simultaneously.
The structure of the information distribution system of the earthquake and tsunami warning system in the embodiment of the invention is shown in fig. 2, and comprises the following components:
a base station and a mobile terminal; wherein,
the base station is used for sending a public key in the information verification key pair; the ETWS initial information is digitally signed by using a private key in an information verification key pair, and the ETWS initial information and the digital signature are added to the paging message and are sent;
the mobile terminal is used for receiving and storing the public key; and the ETWS system is used for receiving the paging message, verifying the ETWS initial information carried by the received paging message through the digital signature carried by the received paging message and the stored public key, and sending out a disaster alarm according to a verification result.
Wherein the base station comprises: the system comprises a key maintenance module, a digital signature module and a first information adding module; wherein,
the key maintenance module is used for randomly selecting a key pair from the key pair pool of the key maintenance module per se at set time intervals, and replacing the currently stored information verification key pair with the selected key pair; when the initially selected cell is resident or cell switching is carried out, a public key in the information verification key pair is sent to the mobile terminal through the connection established in the bidirectional authentication process of the mobile terminal and the base station;
the digital signature module is used for digitally signing the ETWS initial information by using a private key in the information verification key pair;
a first information adding module, configured to add the ETWS initial information and the digital signature to the paging message and send the paging message when it is monitored that the digital signature module completes digital signature on the ETWS initial information;
correspondingly, the mobile terminal comprises: the system comprises a key storage module and a digital signature verification module; wherein,
the key storage module is used for receiving the public key and replacing the public key stored by the key storage module by using the received public key;
and the digital signature verification module is used for receiving the paging message, verifying the ETWS initial information carried by the received paging message through the digital signature carried by the received paging message and the stored public key, and sending out a disaster alarm according to a verification result.
Further, the base station further includes:
a second information adding module, configured to add, when it is monitored that the digital signature module completes digital signature on the ETWS initial information, the ETWS information identifier as a first paging record of the paging message to the paging message;
correspondingly, the mobile terminal further comprises: the device comprises an information confirmation module and a paging module; wherein,
an information confirmation module, configured to check whether a first paging record of a paging record group in the paging message received by the digital signature verification module is an ETWS information identifier or a device identifier, and instruct the digital signature verification module to verify ETWS initial information when a check result is the ETWS information identifier; when the checking result is the equipment identifier, indicating a paging module to perform a paging process;
and the paging module is used for monitoring the digital signature verification module and performing a paging process when the digital signature verification module is monitored to finish the verification of the ETWS initial information or an instruction of the information confirmation module is received.
Further, the system further comprises:
the time limit confirmation module is used for verifying that the public key stored by the time limit confirmation module is not expired according to the time stamp carried by the received paging message;
specifically, the deadline confirming module comprises a timestamp maintenance module and a third information adding module which are arranged on the base station, and a timestamp storage module and a determining module which are arranged on the mobile terminal; wherein,
the timestamp maintenance module is used for replacing the timestamp stored currently by the current time when the key maintenance module is monitored to replace the currently stored information verification key pair, and sending the timestamp stored currently to the timestamp storage module;
a third information adding module, configured to add a timestamp currently stored by the timestamp maintenance module to the paging message when it is monitored that the digital signature module completes digital signature on the ETWS initial information;
the timestamp storage module is used for replacing the timestamp stored by the timestamp storage module with the received timestamp;
and the determining module is used for determining that the time stamp carried by the paging message received by the digital signature verifying module is the same as the time stamp stored by the mobile terminal, considering that the public key stored by the mobile terminal is not expired, and sending the determining result to the digital signature verifying module.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. An information issuing method of an earthquake and tsunami warning system is characterized in that a base station sends a public key in an information verification key pair; the mobile terminal receives and stores the public key; the method further comprises the following steps:
the base station carries out digital signature on the ETWS initial information by using a private key in the information verification key pair, and adds the ETWS initial information and the digital signature to the paging message and sends the paging message;
and the mobile terminal verifies the ETWS initial information carried by the received paging message through the digital signature carried by the received paging message and the stored public key, and sends out a disaster alarm according to a verification result.
2. The earthquake and tsunami warning system information distribution method as claimed in claim 1, further comprising: issuing the ETWS detailed information through a broadcast channel, which specifically comprises the following steps:
the base station broadcasts ETWS detailed information; the mobile terminal receives the ETWS detail information.
3. The information distribution method of the earthquake and tsunami warning system according to claim 1 or 2, characterized in that the base station transmits a public key in an information verification key pair; the mobile terminal receiving the public key and storing comprises:
the base station randomly selects a key pair from a key pair pool per se at set time intervals, and replaces the currently stored information verification key pair of the base station with the selected key pair;
when the initially selected cell is resident or cell switching is carried out, the base station sends a public key in the information verification key pair to the mobile terminal through the connection established in the bidirectional authentication process of the mobile terminal and the base station;
the mobile terminal replaces the public key stored therein with the received public key.
4. The information issuing method of earthquake and tsunami warning system according to claim 1 or 2, wherein the adding the ETWS initial information and the digital signature to the paging message before sending further comprises: adding the ETWS information identifier to the paging message, specifically:
adding an ETWS information identifier into a paging message as a first paging record of the paging message;
correspondingly, before verifying the ETWS initial information carried by the received paging message, the method includes: determining whether the paging message carries ETWS initial information and a digital signature, specifically:
checking whether a first paging record in the paging message is an ETWS information identifier or a device identifier, if the first paging record is the ETWS information identifier, and if the first paging record is the ETWS information identifier, the first paging record is considered to carry ETWS initial information and a digital signature, verifying the ETWS initial information carried by the received paging message, and then performing a paging process; if the paging message is the device identifier, the paging message is considered to not carry the ETWS initial information and the digital signature, and then a paging process is carried out.
5. The method for issuing information of an earthquake and tsunami warning system according to claim 1 or 2, wherein the digitally signing the ETWS initial information comprises:
the base station generates summary information for the ETWS initial information by adopting a Hash algorithm; encrypting the generated digest information by using a private key through an asymmetric encryption algorithm to obtain a digital signature;
the verifying the ETWS initial information carried by the received paging message and sending a disaster alert according to the verification result includes:
the mobile terminal decrypts the abstract information from the digital signature carried by the paging message by using the public key through an asymmetric decryption algorithm; the mobile terminal generates summary information for ETWS initial information carried by the paging message by adopting a Hash algorithm;
the mobile terminal compares whether the decrypted abstract information is the same as the generated abstract information, and if so, a disaster alarm is given; otherwise, the disaster warning is not issued.
6. The earthquake and tsunami warning system information distribution method as claimed in claim 3, further comprising: according to the timestamp carried by the received paging message, verifying that the public key stored by the mobile terminal is not expired, specifically:
after the base station randomly selects the key pair from the key pair pool of the base station at set time intervals, the method further comprises the following steps: the base station replaces the timestamp stored currently by the current time;
correspondingly, when the base station sends the public key in the information verification key pair to the mobile terminal, the method further includes: the base station sends a timestamp stored currently to the mobile terminal;
after the mobile terminal uses the received public key to replace the public key stored by the mobile terminal, the method further comprises the following steps: the mobile terminal replaces the timestamp stored by the mobile terminal with the received timestamp;
before adding the ETWS initial information and the digital signature to the paging message and sending, the method further includes: adding a timestamp currently stored by a base station to the paging message;
before verifying the ETWS initial information carried by the received paging message, the method further includes: and if the time stamp carried by the paging message is the same as the time stamp stored by the mobile terminal, the public key stored by the mobile terminal is considered to be unexpired.
7. An earthquake and tsunami warning system information distribution system, characterized in that the system comprises: a base station and a mobile terminal; wherein,
the base station is used for sending a public key in the information verification key pair; the ETWS initial information is digitally signed by using a private key in an information verification key pair, and the ETWS initial information and the digital signature are added to the paging message and are sent;
the mobile terminal is used for receiving and storing the public key; and the ETWS system is used for receiving the paging message, verifying the ETWS initial information carried by the received paging message through the digital signature carried by the received paging message and the stored public key, and sending out a disaster alarm according to a verification result.
8. The earthquake and tsunami warning system information distribution system according to claim 7, wherein the base station comprises: the system comprises a key maintenance module, a digital signature module and a first information adding module; wherein,
the key maintenance module is used for randomly selecting a key pair from the key pair pool of the key maintenance module per se at set time intervals, and replacing the currently stored information verification key pair with the selected key pair; when the initially selected cell is resident or cell switching is carried out, a public key in the information verification key pair is sent to the mobile terminal through the connection established in the bidirectional authentication process of the mobile terminal and the base station;
the digital signature module is used for digitally signing the ETWS initial information by using a private key in the information verification key pair;
a first information adding module, configured to add the ETWS initial information and the digital signature to the paging message and send the paging message when it is monitored that the digital signature module completes digital signature on the ETWS initial information;
correspondingly, the mobile terminal comprises: the system comprises a key storage module and a digital signature verification module; wherein,
the key storage module is used for receiving the public key and replacing the public key stored by the key storage module by using the received public key;
and the digital signature verification module is used for receiving the paging message, verifying the ETWS initial information carried by the received paging message through the digital signature carried by the received paging message and the stored public key, and sending out a disaster alarm according to a verification result.
9. The earthquake and tsunami warning system information distribution system as claimed in claim 8, wherein the base station further comprises:
a second information adding module, configured to add, when it is monitored that the digital signature module completes digital signature on the ETWS initial information, the ETWS information identifier as a first paging record of the paging message to the paging message;
correspondingly, the mobile terminal further comprises: the device comprises an information confirmation module and a paging module; wherein,
an information confirmation module, configured to check whether a first paging record of a paging record group in the paging message received by the digital signature verification module is an ETWS information identifier or a device identifier, and instruct the digital signature verification module to verify ETWS initial information when a check result is the ETWS information identifier; when the checking result is the equipment identifier, indicating a paging module to perform a paging process;
and the paging module is used for monitoring the digital signature verification module and performing a paging process when the digital signature verification module is monitored to finish the verification of the ETWS initial information or an instruction of the information confirmation module is received.
10. The earthquake and tsunami warning system information distribution system as claimed in claim 8, further comprising:
the time limit confirmation module is used for verifying that the public key stored by the time limit confirmation module is not expired according to the time stamp carried by the received paging message;
specifically, the deadline confirming module comprises a timestamp maintenance module and a third information adding module which are arranged on the base station, and a timestamp storage module and a determining module which are arranged on the mobile terminal; wherein,
the timestamp maintenance module is used for replacing the timestamp stored currently by the current time when the key maintenance module is monitored to replace the currently stored information verification key pair, and sending the timestamp stored currently to the timestamp storage module;
a third information adding module, configured to add a timestamp currently stored by the timestamp maintenance module to the paging message when it is monitored that the digital signature module completes digital signature on the ETWS initial information;
the timestamp storage module is used for replacing the timestamp stored by the timestamp storage module with the received timestamp;
and the determining module is used for determining that the time stamp carried by the paging message received by the digital signature verifying module is the same as the time stamp stored by the mobile terminal, considering that the public key stored by the mobile terminal is not expired, and sending the determining result to the digital signature verifying module.
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