KR20130139498A - Personal information data safeguarding and tracing method for mobile telecommunication terminal - Google Patents

Abstract

The present invention relates to a method for encrypting and tracking data included in a mobile communication terminal when the mobile communication terminal including personal information or USIM chip is lost. According to the present invention, the data encrypting and tracking method for a mobile communication terminal which is managed by a subscriber management system and includes a given loss management program comprises the steps of: operating a loss determination algorithm when the mobile communication terminal is on; preventing the data on personal information from being displayed when the loss determination algorithm determines the mobile terminal is lost; encrypting the hidden data on personal information; transmitting all the data on personal information included in the mobile communication terminal to the subscriber management system when the encrypted mobile communication terminal is able to communicate; and decrypting the data on personal information received by the subscriber management system. [Reference numerals] (1) No service area;(2) Detect an illegal information download;(3) If there is no USIM chip (set a given time);(4) USIM chip is different (compare with an existing USIM chip);(AA) Start;(BB) Power on;(CC,HH,II,JJ,MM,PP,QQ) No;(DD) End;(EE) Subscriber management system;(FF,GG,KK,LL,NN,OO,RR) Yes;(S201) Operate a loss determination alforithm;(S203) Lost?;(S205) Is a user option deletion?;(S207) Delete personal information;(S209) Invisible;(S211) No service area?;(S213,S225) Are communications possible?;(S215) Input a user password;(S219) Visible;(S221) Encryption?;(S223) Encrypt the data on personal information;(S227) Personal information encryption algorithm after determining loss;(S229) Receive the encrypted information and inserted USIM card information by a subscriber management system;(S231) Receive by the subscriber management system;(S233) Decrypt the personal information;(S235) Notify changed USIM chip information;(S237) Collect the mobile communication terminal

Description

PERSONAL INFORMATION DATA SAFEGUARDING AND TRACING METHOD FOR MOBILE TELECOMMUNICATION TERMINAL}

The present invention relates to a method of encrypting and tracking data in a mobile communication terminal when the mobile communication terminal is lost.

Japanese Patent Laid-Open No. 2002-351720 discloses a PIM data management device that uses a PIM function regardless of the memory capacity of a mobile communication terminal according to the method of determining the priority to detect a lost situation and recover important data in the terminal. And management methods.

However, the prior art requires the selection of the data recovery target, or to determine the priority by referring to the schedule, modification and date of the data, which is a problem that the data can not be recovered as intended by the user have.

In order to solve this problem, a mobile terminal device and a data recovery method capable of controlling the priority of data recovery with a single indicator and efficiently recovering data under a limited power amount based on a single indicator are disclosed in the Korean patent application. Is presented in 2005-0122855.

In addition, according to Korean patent application 2003-0101356 "Remote control capable mobile communication terminal and its manufacturing method", if the mobile communication terminal is lost, the user loses the remote control by remotely controlling the mode of the lost mobile communication terminal by sending an SMS message. Turn off all display devices of the mobile communication terminal to prevent illegal use attempts, save battery power, increase the GPS module operating time of the mobile communication terminal, increase the recovery probability, and ESN (Electronic Serial Number) ), And a method for preventing a change or reading of terminal unique information such as a mobile identification number (MIN) is provided.

However, in order to control the lost mobile communication terminal to restrict use of the illegal acquirer, it must maintain a communication state with the lost mobile communication terminal. Currently smartphones (3G phones) and LTE (Long Term Evolution, the technology that 'evolved' 3G generation 3G) has a variety of personal information, content input and output information, encryption information, etc. Communication can be confirmed by checking, and if you remove it, you cannot realistically communicate. Therefore, the remote control presented in the Korean Patent Application No. 2003-0101356 is virtually impossible, and thus it is still difficult to prevent illegal use of the terminal, and it can be said that the problem of terminal retrieval is also difficult.

In addition, Korean Patent Application No. 2006-0122748, filed by Samsung Electronics under the name of “Tracking device and method of mobile terminal”, is a device and method for increasing the recovery rate for a lost portable terminal in a portable terminal including a SIM card. It is described. When the SIM card is installed on the SIM card, the SIM card information is extracted and the SIM card information is compared with the SIM card information preset in the mobile terminal. By limiting the use and by transmitting a text message including the receiver's phone number, the information of the mobile terminal and the contents of the message to the corresponding mobile terminal corresponding to the setting information, the illegal use of the lost mobile communication terminal is prevented. In addition, it suggests a way to track and recover the terminal.

However, the Korean patent application 2006-0122748 does not consider various situations that may occur after the mobile communication terminal is lost. For example, after receiving the lost mobile communication terminal, the recipient may take the action of turning off the power or removing the SIM chip to make communication impossible. If this behavior occurs before the loss of the mobile communication terminal can cause a number of problems. In addition, if communication is not possible even after detecting the loss, this also cannot control the lost mobile communication terminal. Serious problems can arise if the recipient takes steps to make the lost mobile terminal uncontrollable for illegal use. This is because e-mail information in a lost mobile communication terminal, a phone book, an official certificate, and information contained in a memo pad may be used for another illegal purpose. In other words, the method proposed in the Korean Patent Application No. 2006-0127748 has a problem in that a countermeasure cannot be taken when such a serious problem occurs.

The present invention has been made in view of the above-described state of the art, and allows a loss management program to be installed in a mobile communication terminal of a user granted from a subscriber management system, and the loss management program can perform a loss determination algorithm, encryption algorithm, and decryption. It is an object of the present invention to provide a method of protecting and tracking personal information data of a mobile communication terminal for encrypting and tracking data in the mobile communication terminal when the mobile communication terminal is lost, including functions.

In order to solve the problems of the prior art, the present invention allows a loss management program to be installed in a mobile communication terminal of a user granted from a subscriber management system, and the loss management program has a function of performing a loss determination algorithm, encryption algorithm, and decryption. To be included.

In addition, the loss determination algorithm includes a plurality of setting means that the user can determine to be lost, and includes a function for presetting whether to delete or hide the mobile communication terminal determined to be lost.

The present invention operates an algorithm for estimating loss by a loss management program downloaded and installed from a subscriber management system when the mobile communication terminal is lost. When the loss management program is operated, a loss determination algorithm set by a user is determined. The loss determination algorithm is a very important process because the loss is determined and the personal information data is deleted or hidden through the determination result.

The loss determination algorithm may be designed in various cases, and the first condition is when the mobile communication terminal is located in an area where communication is impossible and communication is not possible. The second condition may be set to a case where the loss management program detects this by inserting a source for detecting down a phone book, a notepad, a mail, a certificate, and the like. The third condition may be set to an algorithm including a condition to determine the loss when a predetermined time has passed after the removal of the SIM chip in the lost mobile communication terminal. The fourth condition is that when the SIM chip is inserted, the previously stored SIM chip information is compared with the newly inserted SIM chip information, and if it is different, it is determined to be lost. More specifically, such condition setting may be configured to adapt to the environment of the subscriber management system.

Giving a predetermined time under the third condition is a very important factor considering the case where the user accidentally removes the SIM chip or when the mobile communication terminal is removed by an external shock. If the SIMP chip is accidentally removed in the power off state If the SIMP chip is replaced in the power off state, no problem occurs.

However, if the SIM chip is powered on in the power-off state, the SIM chip does not exist. Therefore, the SIM card is judged to be lost by the loss determination algorithm, and the INVISIBLE and encryption processes are performed. Remote control can be used to face unwanted situations that require a return. In consideration of such a condition, a predetermined time is given after the power-on, and when the U-SIM chip is remounted within that time, it is determined to be normal and the algorithm is not performed after an unwanted loss determination.

In the encryption algorithm, if the mobile communication terminal determined to be lost by the loss determination algorithm is set to invisible in the subscriber management program, it is determined whether to perform encryption according to the cause of the loss determination. Encrypt information data.

In general, the control method of the mobile communication terminal analyzes the monitoring or control request of the IT management information received from the personal mobile communication terminal and transmits it to the IT management server and transmits the IT management information received from the IT management server to the personal mobile terminal. It can be configured to include a relay server to search and control various faults, network performance, system performance, database and application performance, and of course, encryption and decryption can be performed through this process.

Herein, the encryption of the mobile communication terminal is performed by encrypting a string such as a PKI method for maintaining the security of the network and the Internet during data communication on the network, or by acquiring the source address and the destination address of the data packet to correspond to the existing general identifiable string. It is possible to perform various encryption algorithms, such as encrypting a string by converting the corresponding string differently from case to case based on the value obtained from the operation result of the source address and the destination address.

Since the encryption method according to the present invention is related to a special situation of the loss of the mobile communication terminal, in consideration of this, it is preferable to embed an encryption algorithm in the mobile communication terminal itself so that encryption can be performed even when communication is impossible.

Since the encryption of the personal information data is performed in the mobile communication terminal itself, it is not affected by the communication state of the terminal. In addition, since personal information data that is determined to be lost and invisible may be leaked by a high-level expert in the relevant field, an additional function of encrypting the personal information data in the lost mobile communication terminal is performed after performing an invisible function. By ensuring that personal information data is protected. The personal information data of the mobile communication terminal is more securely protected. Of course, it can also be decrypted in the controllable terminal center by communicating with the encrypted mobile communication terminal.

The decryption algorithm transmits the encrypted personal information data of the user mobile communication terminal to the subscriber management system when communication is possible between the user mobile communication terminal and the subscriber management system after performing encryption by the loss determination algorithm. The subscriber management system can track the illegal use of the mobile communication terminal by decrypting the received encrypted personal information data.

In addition, when a user subscribed to the subscriber management system accidentally removes the SIM chip, even after the predetermined time elapses, use of the personal information data of the user and normal communication become difficult. Therefore, if the administrator of the subscriber management system requests to return to the normal state to return to the normal state, the process of remotely performing decryption after the subscriber identity verification is included.

The present invention relates to a method of encrypting and tracking data in a mobile communication terminal when a personal information data or a mobile communication terminal including a SIM chip is lost. The present invention is managed by a subscriber management system, and thus a predetermined loss management program. In the mobile communication terminal having a built-in, the process of operating the loss determination algorithm when the mobile communication terminal is in the power-on state, and if the result of the loss determination algorithm is determined to be lost personal information data is displayed on the screen of the mobile communication terminal And a process of performing encryption of the hidden personal information data, and transmitting all personal information data existing in the mobile communication terminal to the subscriber management system when the encrypted mobile communication terminal becomes communicable. Process, and the subscriber tube And to include the process of performing the decoding of the personal information data received by the system.

Also, according to the present invention, since the mobile communication terminal receives the mobile communication terminal, the mobile communication terminal can perform the communication according to the time, the situation where the communication is impossible, the algorithm before and after the removal of the chip, And to provide a method for protecting valuable customer information contained in a terminal and further for recovering a lost mobile communication terminal. In addition, the terminal may apply an algorithm that can be executed even when there is no SIM chip.

Preferably, consideration should be given to situations that may be intended to be returned to the owner of the mobile communication terminal after receipt. The present invention is to provide a method of recovering the most desirable data loss terminal in consideration of the various situations as described above after the mobile communication terminal is lost.

As described above, according to the method for protecting and tracking personal information data of a mobile communication terminal proposed by the present invention, the personal information data can be safely protected according to a situation in which the lost mobile communication terminal is disposed. In addition, according to the present invention can recover the recovery rate by analyzing all the user information of the lost mobile communication terminal.

1 is a block diagram schematically illustrating a remote control system for deleting personal information stored in a lost mobile communication terminal according to an embodiment of the prior art;
2 is a diagram illustrating a method for encrypting and tracking data in a mobile communication terminal according to an exemplary embodiment of the present invention.
3 is a diagram illustrating a method of tracking personal information data and tracking chip information in an encrypted mobile communication terminal in a subscriber management system according to an exemplary embodiment of the present invention.

Hereinafter, the principle of operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

It should be noted that only the parts necessary for understanding the operation according to the embodiment of the present invention will be described in the following description, and the description of other parts will be omitted within the scope of the present invention.

The terms or words used in the claims of the present invention described below should not be construed as limited to ordinary or dictionary meanings and the inventor should appropriately interpret the invention in terms of terms in the best way possible It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, it should be understood that various equivalents and modifications may be made without departing from the spirit and scope of the present invention.

In the present invention, a state in which communication is possible and a state in which communication is impossible are interlocked and programmed. That is, after receiving the mobile communication terminal, the mobile communication terminal can perform the communication according to the temporal flow, the communication impossible state, and the algorithm before and after the removal of the wasting chip, And to provide a method for recovering a lost mobile communication terminal. In addition, the terminal may be capable of applying an algorithm that can be performed even when there is no wasted chip (means for substituting wasted chips in the terminal).

In addition, the core of the present invention is that when the mobile communication terminal is lost by the loss determination algorithm, the customer information in the lost mobile communication terminal is invisible (INVISIBLE) and the encryption of the invisible information to the receiver forcibly data To prevent collection. In addition, the customer information in the mobile communication terminal that is determined to be lost is invisible and encrypted by the loss determination algorithm, and then stored outside the unstable area or by inserting a SIM chip (the SIM chip is the original user or another illegal user). If any one of them is sufficient), when the communication is enabled, the program is configured to transmit the user's SIM chip information and the newly inserted SIM chip information to the subscriber management system simultaneously or either. Include it. In addition, it is possible to provide the subscriber management system with means for tracking the lost mobile communication terminal by decrypting the received encrypted customer information.

In addition, a loss management program can be installed in a subscriber mobile communication terminal by a user in the subscriber management system, and the program includes functions such as a loss determination algorithm, an encryption algorithm, and a decryption.

1 is a block diagram schematically illustrating a system for deleting personal information stored in a lost mobile communication terminal according to an embodiment of the prior art.

The personal information protection system of the prior art includes a user terminal 120, a mobile communication network 110, subscriber management system 100 and the like.

The user terminal 120 inputs a short message according to a user's key value input, and then attempts to call the wireless base station 111 including the base station 113 and the base station controller 112 and transmits the input short message to the mobile communication network ( 110 is a mobile communication terminal 120 for transmission. The user terminal 120 is a model capable of using a short message, and is a terminal subscribed to a short message service in order to use a short message. In the exemplary embodiment of the present invention, the mobile communication terminal 120 is used as an apparatus for inputting and transmitting a short message. However, a web browser may be installed and a computer capable of internet access for inputting and transmitting a short message on the web may be included. In addition, the user terminal 120 is connected to the mobile communication network 110 to perform a normal voice call by wireless communication with the destination terminal, and automatically performs a session establishment procedure in response to a session establishment request from the mobile communication network 110. And a terminal for transmitting and receiving packet data.

The user terminal 120 checks the personal information through the personal terminal information DB 101 of the subscriber management system 100 and transmits a control signal to the mobile communication switching station 114 through a program embedded in the personal information deleting server 102. Send and receive a delete command message from the SMSC (115) SMS center to delete the personal information stored in the memory of the user terminal 120. Herein, the personal information means information including any one or more of a list of telephone numbers, pictures, videos, call history, short message transmission / reception, personal files, and the like stored in the user terminal 100.

Here, the delete command message is a message for controlling the user terminal 120 to delete the contents of the memory in which the personal information is stored. When the delete command message is received by the user terminal 120, the control unit of the terminal controls the application program. It recognizes and analyzes the delete command message and deletes all personal information stored in the memory of the user terminal. In order to implement such a function, the application program and the controller stored in the user terminal 120 include a function of recognizing and processing a delete command message.

The prior art described in FIG. 1 generates a control message request signal and transmits it to an SMS center to obtain the status and location information of the terminal. The control message is transmitted to the user terminal through a call channel and stored in a memory of the user terminal. Delete personal information. In addition, when it is impossible to transmit a control message from the personal information deleting server to the user terminal, periodically transmits the J message to the user terminal to determine the communication status to delete the personal information in the user terminal as described above.

Such a prior art cannot control the lost mobile communication terminal unless communication is allowed according to the state of the lost mobile communication terminal or the state of the wireless communication network. Therefore, in order to solve the problems of the prior art, the present invention waits for a program through a loss determination algorithm in a lost mobile communication terminal, and deletes itself without any communication when a predetermined predetermined condition is determined to be lost. To provide. In addition, the subscriber management system that provides the service allows the user to select INVISIBLE, which is a data hiding function, in addition to deletion when it is determined to be lost upon initial membership.

In particular, prior to performing the algorithm, it may be remotely controlled as in the prior art by communicating with the subscriber management system through the loss report.

As described above, the present invention provides a loss determination algorithm embedded in a member's mobile communication terminal when a member of a certain subscription group (bank, securities, insurance, etc., a service related company, etc.) is not able to be remotely controlled due to a communication inability to lose a mobile communication terminal. Install the program.

The embedded program includes an option for selecting whether to delete or invisible customer information when it is determined that the mobile communication terminal is found to be lost. Deleting customer information completely is useful for selecting when the customer's judgment is that the personal information data in the lost terminal contains high-level information such as core technology in a specific industry, and it is important information with risks such as enormous ramifications if it is leaked. Function.

However, even if the lost mobile communication terminal is not found, the customer who wants to look up his information again and the customer who wants to recover the lost mobile communication terminal must select INVISIBLE as an option.

In addition, the uncommunicable state is possible even if the receiver of the lost mobile communication terminal intentionally removes the SIM chip. In this case, because the communication is not possible, the receiver of the lost mobile communication terminal is equipped with a program in which the loss determination algorithm is embedded in the mobile communication terminal so that the deleted and invisible program can be operated in the lost mobile communication terminal itself. It can prevent the act of cheating.

In addition, as will be described later, it is possible to program to automatically save whenever there is a change in the user's SIM chip information in case the receiver of the lost mobile communication terminal is equipped with a new SIM chip. By doing so, it is possible to prevent the recipient of the lost mobile communication terminal from using it illegally.

2 is a diagram illustrating a method of encrypting information in a mobile communication terminal and a tracking method of the mobile communication terminal according to an exemplary embodiment of the present invention.

The mobile communication terminal managed by the subscriber management system can be lost at any time, and if it is lost, it is necessary to accurately determine the loss and to prevent the leakage of all personal information data in the lost mobile communication terminal afterwards. Referring to FIG. 2, when the mobile communication terminal is powered on, the loss determination algorithm may operate by a preset loss management program.

As shown in step S201 is made by downloading a program including a loss determination algorithm of the mobile communication terminal through the subscriber management system.

The loss determination algorithm may be designed in various cases, and the first condition is when the mobile communication terminal is located in an area where communication is impossible and communication is not possible. The second condition may be set to a case where the loss management program detects this by inserting a source for detecting down a phone book, a notepad, a mail, a certificate, and the like. The third condition may be set to an algorithm including a condition to determine the loss when a predetermined time has passed after the removal of the SIM chip in the lost mobile communication terminal. The fourth condition is that when the SIM chip is inserted, the previously stored SIM chip information is compared with the newly inserted SIM chip information, and if it is different, it is determined to be lost. More specifically, such condition setting may be configured to adapt to the environment of the subscriber management system.

Giving a predetermined time under the third condition is a very important factor considering the case where the user accidentally removes the SIM chip or when the mobile communication terminal is removed by an external shock. If the SIMP chip is accidentally removed in the power off state If the SIMP chip is replaced in the power off state, no problem occurs. However, if the SIM chip is powered on in the power-off state, the SIM chip does not exist. Therefore, it is determined to be lost by the loss determination algorithm, and the INVISIBLE and encryption process are performed. You can face unwanted situations where you need to perform remote control by remote control. In consideration of such a condition, a predetermined time period after power-on should be given so that it can be judged to be normal when the SIMP chip is remounted within that time, so that the algorithm after the unwanted loss determination must not be performed. In addition, the same process should be performed when the SIM chip is removed in the power-on state. However, the user can set a predetermined time that can be set in the loss management program very short (also set to 0) so that if the SIM chip is removed, it can be determined to be lost within a very short time.

Next, if it is determined in step S203 to be lost and determined to be no, the situation is not immediately lost. If it is determined to be lost, in step S205, an option set by the user after the initial program download or later set by the user is deleted or invisible ( INVISIBLE) performs the following operation.

If the user option is a deletion, all the information is deleted as in step S207, and such deletion may be limited to the case where the owner of the original mobile communication terminal selects it as very important or special secret information inside the terminal.

In step S209, if the user option is selected to be invisible (INVISIBLE), the receiver of the lost mobile communication terminal performs a hidden function so that the personal information cannot be viewed. If the local area in step S213 to check whether the communication is possible repeatedly in the communication state in step S215 to enter the user password set in the loss management program. If the preset password and the password input by the user match, it is visible to return to the normal state.

If it is not in step S211, if it is not encrypted in step S221, it is determined whether encryption is already performed, and if it is not encrypted, then in step S223, the encryption is performed, and in step S225, the communication state is checked by repeatedly checking the communication status. In step S229 to transmit the encrypted information and inserted SIM card information to the subscriber management system.

In step S221, the encryption has already been performed, and in the next step S225, the communication state is repeatedly checked. In this case, after a predetermined time elapses after power-on, it is determined to be lost and the power is turned off after encryption is performed. When the power is turned on again, the encryption is already performed, so step S225 is performed.

Thereafter, the subscriber management system receives the information through the step S231 and performs the decryption in step S233, so that the information on the element owner of the lost mobile communication terminal can be grasped, and furthermore, inserted by the receiver of the lost mobile communication terminal. After identifying the SIM chip information, step S235 may be performed to notify the institution that processes the SIM chip information. Eventually, the mobile terminal can be recovered at step S237. Of course, the subsequent administrative processing may be different depending on the situation of the subscriber management agency.

3 is a diagram illustrating an algorithm for encrypting and decrypting the user information data in a mobile communication terminal according to an embodiment of the present invention.

Referring to FIG. 3, the encryption step S223 of the personal information data encryption flow (S227) after the loss determination will be described in more detail.

In step S301, the loss management program downloaded and installed from the subscriber management system managing the lost terminal generates a data burst signal for requesting encryption after performing INVISIBLE if it is determined to be lost.

S303 receives the burst signal from S301 and receives the generated encryption request to encrypt the personal information data area within the terminal. Subsequently, in step S305, the personal information data area in the SIM chip attached to the mobile communication terminal is encrypted, and in step S307, the personal information data area in the removable memory is encrypted. In this way, when the encrypted personal information data can be communicated by inserting a SIMP chip in step S309, the subscriber management system generates a personal information data decryption request burst signal in step S311 to perform decryption of the personal information data area in the terminal in step S313. In the step of decrypting the personal information data area in the SIMP chip, and in step S317 to decrypt the other personal information data area in the removable memory.

In addition, the subscriber management system may perform decryption remotely at the request of the user.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

100: subscriber management system, 110: mobile communication network,
111: radio base station, 112: base station controller,
113: base station, 120: mobile communication terminal (user terminal).

Claims (8)

In a mobile communication terminal managed by a subscriber management system and containing a predetermined loss management program,
A loss determination algorithm operating when the mobile communication terminal is powered on;
Preventing personal information data from being displayed on the screen of the mobile communication terminal when it is determined that the loss determination algorithm result is lost;
Performing encryption of the hidden personal information data;
Transmitting all personal information data existing in the mobile communication terminal to the subscriber management system when the encrypted mobile communication terminal becomes available for communication;
And encrypting the personal information data received by the subscriber management system. The method of claim 1, further comprising: repeatedly checking a communication possible state when the mobile communication terminal including the hidden personal information data is in a dead zone;
Requesting input of a user password preset to the loss management program when the communication is enabled;
And if the user password matches a preset user password, displaying the personal information data on the screen of the mobile communication terminal. The method of claim 1, further comprising: determining that the signal is lost when a signal for downloading content in the mobile communication terminal is downloaded to download the data in the mobile communication terminal. The data encryption method of claim 1, further comprising: determining that the lost chip is removed when the predetermined time period is elapsed in the loss management program after the removal of the SIM chip in the mobile communication terminal. And tracking method. The method of claim 1, further comprising: determining that the chip is lost when the SIM chip is inserted into the mobile communication terminal when the SIM chip is different from the existing SIM chip information. [2] The method of claim 1, wherein priority is given to the priority of the data in the mobile communication terminal according to importance. The data in the mobile communication terminal according to claim 1, further comprising: after performing the encryption of the mobile communication terminal, transmitting all the SIM chip information in the mobile communication terminal to the subscriber management system when the mobile communication terminal can communicate. Encryption and tracking methods. The method of claim 1, further comprising tracking changed SIMP chip information after decrypting the data information received by the subscriber management system.

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