KR100298074B1 - Security method for storing an amount of money - Google Patents

Abstract

The present invention relates to a security method when charging the amount of money, and in particular, the amount of money charged by encrypting and transmitting the amount of money data exposed on the transmission channel when charging the amount of money to the electronic card using wireless, and receiving and decrypting the transmitted amount data The purpose is to provide security and reliability. To this end, the present invention performs a step of separately transmitting the charge amount and the charge amount up to now in the wireless operator system on the transmitting side, and the first and second transmissions transmitted from the transmitting side in the portable terminal on the receiving side Decoding each signal; determining whether the total amount stored up to a predetermined number of times in the card and the total amount restored from the secondary signal transmitted from the transmitting unit are identical; and if the total amount is identical, Judges that the amount of charge transferred is justified and stores it in the card.

Description

SECURITY METHOD FOR STORING AN AMOUNT OF MONEY}

The present invention relates to a portable terminal, and more particularly, to a security method for charging money using wireless.

The use of cards has become commonplace based on the development of the information industry.

Currently, a payment service is provided for payment of a fee in an amount charged in a card without cash or a ticket as a payment method.

Cards for providing such services generally use a contactless radio recognition card.

Communication between the card and a reader or charger capable of reading / writing information in the card uses an Amplitude Modulation (AM).

The RF card contains a radio frequency (RF) chip, which is used as a means of supplementing money and paying transportation costs.

Such a card can save time and hassle to purchase a ticket when using public transportation, and has the advantage of eliminating the inconvenience of giving and receiving change.

However, the conventional card has a problem of having to visit the charging station to charge the amount of money used, and also causing a loss to the user when the card is lost.

Therefore, in order to improve the problem in the conventional card, a technology that can provide convenience to the user by combining the portable terminal and the chargeable electronic card to charge the amount wirelessly has been proposed.

However, this technique requires security for money charging and use.

Accordingly, the present invention provides security and reliability for the charged amount by encrypting and transmitting the amount data exposed on the transmission channel when charging the amount to the electronic card using wireless, and receiving and decrypting the transmitted amount data. It is an object of the present invention to provide a security method when charging the amount created.

For this purpose, the present invention secures stability and security by a double signal transmission method, which secures independence from general call and money charging by a transmission pattern, and applies multiple encryption and RANDOM FUNCTION techniques for money charging. This allows the implementation of transport protocols to achieve complete security.

1 is a block diagram of an apparatus for practicing the present invention.

2 is a block diagram of a network for implementing the present invention.

3 is a signal flow diagram for practicing the present invention.

4 is an exemplary view showing transmission information applied to a numeric calling method.

5 illustrates an exemplary transmission structure according to FIG. 4;

6 is an exemplary view showing transmission information applied to a text call method.

7 illustrates an exemplary transmission structure according to FIG. 6;

8 is an exemplary view showing a specific bit conversion of a specific digit when called in the present invention.

9 is an exemplary view illustrating a signal transmission flow of a fast radio call method.

10 is an exemplary view showing a frame structure in FIG.

11 is an exemplary view showing a transmission structure of the present invention according to FIG.

12 is an exemplary view showing a transmission structure for a numeric call of a fast radio calling method.

13 is an exemplary view showing a transmission structure for a text call of a fast radio call method.

14 is a signal flow diagram illustrating a data extraction process in a high-speed numeric call of the present invention.

15 is a signal flow diagram illustrating a data extraction process in a fast text call of the present invention.

Explanation of symbols on the main parts of the drawings

210: radio signal receiving block 211: high frequency processing unit

212: key input unit 213: display unit

214: tone signal generator 215: microcomputer

220: operation logic block 221: wireless interface unit

222: non-contact interface 223: CPU (CPU)

224: RAM 225: ROM

230: memory block 240: non-contact block

241: variation demodulation unit 242: non-contact operation unit

The present invention provides a method for storing an amount of money in an electronic card in order to achieve the above object. Decoding each of the first and second primary signals, determining whether the total amount of money stored in the card a predetermined number of times and the total amount restored from the secondary signal transmitted by the transmitting side are identical; If this is matched, it is characterized in that the receiving side includes the step of determining the charge amount transmitted from the transmitting side as being justified and storing it in the card.

In the above, N-order transform technique and random function technique are performed to encrypt primary and secondary transmission signals.

The inverse transform of the N-order transform scheme and the inverse transform of the random function scheme are performed to decode the primary and secondary transmission signals.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a block diagram of an apparatus for implementing the present invention, as shown therein, when receiving a radio signal to determine whether it is general radio call information or money charge information, and if it is determined as general radio call information to display the call contents. And the amount of charging information in the wireless signal receiving block 210 for determining whether there is a transmission error, a memory block 230 for storing the charged amount, and the amount of charging information in the wireless signal receiving block 210. The serial number of the wireless signal reception block 210 is compared with the previously stored serial number, and if the serial numbers match, the subscriber's unique identification name (user identification name, chip identification name) and the amount of data are decoded through decoding of the charge information. Extracts and determines whether there is an error, and if there is no error, stores the amount data in the memory block 230 and A calculation logic block 220 for reading the charge amount data stored in the memory block 230 and transmitting the charge amount data stored in the memory block 230 to the wireless signal receiving block 210 in the case of the signal for checking the charge amount details in the wireless signal receiving block 210 and a card charger; And a non-contact block 240 which detects the amount of charge signal in Equation 2 and converts the signal into a predetermined format and stores it in the memory block 230.

The radio signal reception block 210 is a high frequency processor 211 for amplifying and decoding a radio signal, a key input unit 212 for inputting an arbitrary key signal, and the radio call information or the operation logic block 220 to decode Tone for generating a specific sound for a specific letter or number for the display unit 213 for displaying the amount of charge information passed through the process in letters or numbers, and the result of decoding the amount of charge information in the operation logic block 220 The signal generator 214 and the output signal of the high frequency processor 211 are read to determine whether it is general radio call information or money charge information. In the case of general radio call information, the signal is transmitted to the display unit 213. In the case of reordering the charge amount information in a predetermined format suitable for the arithmetic logic block 220 and transmitting it to the arithmetic logic block 220, the specific character which has undergone the decoding process accordingly. Displays a number on the display unit 213 and simultaneously drives the tone signal generator 214. When the key signal from the key input unit 212 is read as a charge amount indication signal, the operation logic block 220 And a microcomputer 215 receiving the charge information and transmitting the received information to the display unit 213.

The arithmetic logic block 220 may include a wireless interface unit 221 for transmitting and receiving information with the wireless signal receiving block 210 and a serial number of the wireless signal receiving block inputted to the wireless interface unit 221. If it compares with the serial number stored at 230, the amount of charge information is decrypted to extract the subscriber unique key value and the amount data, and the subscriber unique key value is compared with the subscriber unique key value stored in the memory block 230 to determine whether the subscriber is legitimate. If the subscriber is a legitimate subscriber, the amount data is stored in the memory block 230, and when the charge amount history request signal is input through the air interface unit 221, the charge amount details are read from the memory block 230 and the air interface unit 221 is read. CPU (223) for transmitting to the wireless signal receiving block 210 through the, and the security program, the amount charge management program, etc. by storing the Is composed of ROM (ROM) (225) and a RAM (RAM) (224) for storing operation data of the ssipiyu 223 provided in oil 223. The

The memory block 230 is configured by allocating the charge amount details and various authentication information to a separate storage area and separately allocating an area for storing the charge amount details.

The contactless block 240 detects a high frequency signal from the card charger, converts the signal into a predetermined format, and transmits the converted predetermined format signal to the memory block 230 to charge money. After the predetermined format signal passed through the modulation / demodulation unit 241 is processed by the non-contact calculation unit 242, the amount of money data is generated, and the amount of data is transferred to the memory block 230 and stored.

Referring to the operation and effect of the embodiment of the present invention configured as described above are as follows.

For the present invention, the wireless operator should provide the subscriber with a deposit and withdrawal service in connection with a financial institution.

That is, the configuration of the communication network for the present invention, as shown in the configuration diagram of Figure 2, the wireless operator should be established with the communication network with the exchange office, financial institutions, merchants, card companies and VAN operators, the addition Value network operators should establish a network between card charging stations, their merchants and financial institutions.

In addition, in order to charge a desired amount in the electronic card using the communication network, the subscriber must open an account with a financial institution associated with the wireless carrier.

The charging operation of the desired amount of money in the electronic card using such a communication network is the same as the signal flow diagram of FIG. 3.

First, the subscriber can charge using the telephone to wirelessly charge the electronic card coupled to the pager.

Calling their pager number using a telephone enters the call request signal into the wireless operator system via the switching center.

At this time, the wireless operator system determines whether the number is available, and if the number is available, executes an automatic answering function to call the phone number, voice memo, Send a voice message to the calling subscriber via the switching center to request selection of 'charge the money' or 'suspend'.

Therefore, if the subscriber wants to charge the electronic card, he or she presses the number key or the symbol key corresponding to the 'charge amount', and the wireless service provider automatically responds to enter the amount of money to be determined as 'charge amount'. When the function is executed and the subscriber presses a numeric key corresponding to the desired amount, the subscriber detects this and sends a voice message to the subscriber to select whether or not to exit.

Here, in the case of 'charging the money' or 'suspension of use' it is required to enter the password at the beginning of the operation.

Therefore, if a subscriber inputs a desired amount in response to an automatic response for 'charging the amount', the wireless operator system opens a communication through a value-added communication network (van) or directly with a financial institution directly linked to the desired amount of the account of the subscriber. If there is enough money to require and charge a search to see if the subscriber is in charge, the subscriber's pager will be called to send the charge amount data.

In this case, the wireless operator system encrypts the charge amount data and transmits it.

In the present invention, the charge amount encryption is encryption for the first charge amount signal and the second sum amount ACK signal.

First, different user identification names and chip identification names are stored in advance in a chip embedded in an electronic card combined with a pager in order to generate and confirm the first charge amount signal and the second sum amount signal ACK.

In the present invention, a case in which the user recognition name is a 7-digit hexadecimal number and the chip recognition name is an 8-digit number in hexadecimal will be described by way of example.

In this case, the reason for using two recognition names is a dual transmission scheme in which the first charge amount signal and the second total amount signal are both received and successfully received in order to provide a one-time charge service. This is to use a primary signal and a secondary signal interchangeably using a recognition name.

First, the encryption process of the primary transmission signal will be described.

To generate the charge amount signal for the first transmission, multiply each digit of the decimal number (DEC) by each recognition name, multiply the recognition name (DEC) and the charge amount (DEC) by the chip, and convert the result into a hexadecimal value. .

Here, the unit of the charge amount is 10,000 won unit, for example, 30,000 if the multiplied by '3'.

At this time, each recognition name is converted into a decimal number and multiplied by the charged amount because the amount unit is a decimal system, and the result is converted into a hexadecimal number because the wireless call transmission system can transmit the hexadecimal system. This is because the transmission is more efficient than the decimal system.

For example, a two-digit number is transmitted when a decimal number '12' is transmitted, but a single-digit number 'C' can be transmitted in a hexadecimal number.

After that, the positions corresponding to the specific digits are exchanged between the hexadecimal converted results.

For example, inverting each other for a number greater than or equal to a certain value, or inverting the number of left and right based on the number greater than or equal to the specific value, which is used to not expose the chip identification name and the charge amount.

Subsequently, the hexadecimal value of the user recognition name is subtracted from the result of the digit conversion, and the subtracted result is taken as a complement of (16 ^ r -1) for the remaining number except the first digit.

This means that the complementary value is performed to hide the result of subtracting the unique number only. The reason for excluding the first digit is that the first digit is recognized as '0' when the result of the complement of the first digit is '0'. This is to prevent the total number of digits from decreasing.

Subsequently, the result of taking the complement takes one's complement of one or two bits for a specific bit of a specific digit.

This is because the hexadecimal representation consists of 4 digits in one digit, of which '0' is converted to '1' and '1' is converted to another hexadecimal number for a particular bit. .

Here, the purpose of converting a specific bit is to take a '1' complement to a specific bit in order to further secure this since the conversion up to this point has performed only a conversion of a number, that is, a conversion of 4 bits.

Thereafter, after performing the first encryption as described above, the second encryption is finally performed using a random function method using various functions defined as follows. For example, if five functions are defined, they are as follows.

In this case, if five functions are arranged in the case of 5 ^ 5 = 3125 according to the number of times of transfer of the charged amount data, it may be expressed as a random function as follows.

f_1 f_1 f_1 f_1 f_1, f_1 f_1 f_1 f_1 f_2, ..., f_3 f_3 f_3 f_5 f_4, f_3 f_3 f_3 f_5 f_5, ..., f_5 f_5 f_5 f_5 f_4, f_5 f_5 f_5 f_5 f_5

In this case, the reason for using the random function function is to perform different function values every time the money request is made for the method that is converted to a certain law, so that even if the subscriber keeps charging the money, it is different from the previously transmitted data. It is intended to be inferred from being sent to

In addition, the pager can be used to decode the random function by incrementing the counter value by '1' for each charge.

Accordingly, the final primary transmission signal is a value obtained by adding a counter value to a decimal number and adding one of the result values '0 to 4' corresponding to the last digit to the final random function execution result value.

This is to check the number of charges of the pager, that is, the counter value.

If the counter does not match, the operation will be performed differently in the execution of the random function function and eventually an error will occur.

After that, when the primary transmission signal is encrypted and transmitted by the above process, an encryption process for the total amount is performed using various conversion techniques and random function functions to transmit the secondary transmission signal. .

First, the amount charged for a predetermined number of times (for example, four times) and the amount to be charged now are added, the result value is divided by '10000', and the result of division is subtracted from the specific three-digit value DEC.

This is to use a subtracted value from a certain number to prevent the total amount from being sent.

In this case, the subtracted result is converted to hexadecimal and multiplied by the sum of the user recognition name and the chip recognition name.

This method has the advantage of using both the decimal and hexadecimal systems while using the two distinguished names using the hexadecimal system in the primary signal, while using the distinguished names in the primary signal.

Thereafter, the last digit of the value converted from the number of charges into a decimal number is determined as a decimal number and multiplied by '1111 (DEC)'.

The result is one of '0000, 1111, 2222, 3333, 4444', which is converted to hexadecimal and added to the result of multiplying the total amount.

This is to check the counter value in the pager even in the secondary transmission signal.

Thereafter, the specific digit position exchange is performed in the same manner as in the encryption process for the primary transmission signal, the purpose of which is not to expose the chip identification name and the charge amount as in the primary transmission signal.

Thereafter, the resultant takes the complement of (16 ^ r -1) for the remaining digits except the first digit, and converts a specific bit for a specific digit for the resultant result in the same manner as the primary transmission signal. Its purpose is to take a '1' complement on a specific bit to improve security, since the conversion up to this point, like the primary transmission signal, has performed only the conversion of numbers, that is, conversion of 4 bits. .

Here, the specific bit conversion of the specific digit may be the same as or different from the specific bit of the specific digit of the primary transmission signal.

Thereafter, operations using a random function function in the encryption process of the primary transmission signal are sequentially performed on the result of bit conversion.

After that, one of '0, 1, 2, 3, 4' corresponding to the last digit is added to the result value of performing the random function as the hexadecimal number, and the result value is added. It calculates by the 2nd total amount signal.

In this case, the reason why the total amount of money is transmitted in the secondary transmission signal is used to determine whether the primary transmission signal is decoded to the amount to be charged.

Therefore, when the encrypted charge amount data is transmitted by the above operation, the wireless pager that receives the decrypted data charges the desired amount to the card when normal data is transmitted. The operation thereof is as follows.

First, when the subscriber's wireless pager is called, the radio signal receiving block 210 converts the received signal into a digital signal and transmits the received signal to the microcomputer 215.

At this time, the microcomputer 215 searches for the presence or absence of a predetermined pattern of signals in the digital signal from the high frequency processor 211 to determine whether it is a general wireless call or money charging information.

Accordingly, when there is no signal of a certain pattern (for example, '1010' in the case of a number pager) indicating that the charge amount is information in the signal pattern, and the microcomputer 215 determines it as general wireless call information, the microcomputer 215 converts the number or letter into a display unit 213 Call the subscriber with the call information.

On the contrary, when the signal of the pattern received from the high frequency processor 211 has a predetermined pattern of signal indicating the amount of charge information and determines the amount of charge information, the microcomputer 215 is in a predetermined format suitable for the arithmetic logic block 220. Rearrange the information to determine if a transmission error has occurred.

At this time, when it is determined that a transmission error occurs, the microcomputer 215 generates a transmission error signal (for example, '2001') and transmits it to the display unit 213 and simultaneously transmits a specific sound signal corresponding to '2001' to the tone signal generator. And transmits an error to the subscriber.

Therefore, when a charge amount error occurs, the subscriber sets the retransmission mode while listening to the voice memo from the wireless operator system, and the wireless operator system transmits the charging amount information again.

When there is no transmission error, the microcomputer 215 transmits the rearrangement of the amount of charge information, that is, 48 bits or less under the checksum bit, to the arithmetic logic block 220 together with two bits following the '1010' bit. .

At this time, the CPI 223 in the operation logic block 220 is a radio signal reception block stored in the memory block 230 in a transmission signal from the radio signal reception block 210 received through the radio interface unit 221. It is compared with the serial number (pager identification name) of 210, and if it does not match, the CPI 223 is determined to be an illegal user and invalidates the currently charged amount charging information.

If the serial number of the wireless signal reception block 210 is identical, the CPI 223 determines whether the amount of charging information or stoppage information is used, and if it is determined as the amount of charging information, the CUI 223 determines the wireless signal receiving block ( The amount of charge information, which is the primary transmission signal received at 210, is decoded. The decoding process is as follows.

First, the CPI 223 converts the counter value stored in the pager into a decimal number, converts the last digit into a hexadecimal number, and subtracts the converted value from the value transmitted from the wireless signal receiving block 210 and subtracts the converted value. An inverse transform of the random function function is performed on the result value with the counter value converted into a decimal number.

Thereafter, the CUI 223 determines data position information and performs a specific bit conversion of a specific digit on the value finally restored by the inverse transformation of the random function function, except for the first digit. Take the (16 ^ r -1) complement of the remaining digits and add that value to the hexadecimal value of the user's distinguished name.

Thereafter, the CPI 223 converts the value restored in the previous process to a specific digit, converts it to a decimal value, and converts the decimal value of the chip recognition name and each digit of the decimal number of the user recognition name and the chip recognition name. The multiplied value divides the converted decimal value to determine whether the remainder is '0'.

If the remainder is not '0', the CPI 223 determined to be an operation error transmits an operation error signal (eg, '2003') to the wireless signal reception block 210 and displays it on the display unit 213.

When the remainder is '0', the CPI 223 determines whether the share obtained in the above process is equal to or greater than a predetermined amount by adding up the remaining balance.

If it is determined that the total amount is greater than or equal to a predetermined amount, for example, when the memory area is set so that the memory block 230 can be charged up to '990,000 won', the sum of the charge amount and the balance stored in the memory block 230 are summed. When the amount exceeds 990,000 won, the CPI 223 transmits an overflow signal (for example, '2003') to the wireless signal receiving block 210 through the wireless interface unit 221.

Accordingly, the wireless signal receiving block 210 transmits the overflow signal to the display unit 213 and simultaneously transmits an error sound driving signal to the tone signal generator 214 to exceed the amount that can be charged in the memory block 230. Let the subscriber know that you have done so.

On the contrary, if the sum amount is smaller than the predetermined amount, the CPI 223 determines that the charged amount data is normally received and decodes the secondary transmission signal input from the wireless signal receiving block 210 to store the charged amount data. Will be performed.

First, the CPI 223 checks the pattern of the signal transmitted from the radio signal reception block 210 and checks the checksum bit in the case of the sum ACK pattern to confirm the occurrence of a transmission error, and if there is no transmission error, the radio signal. The serial number (pager identification name) of the reception block 210 and the serial number (pager identification name) stored in the memory block 230 are compared and judged.

At this time, if the serial numbers match, the CPI 223 inversely converts the sequence number information included in the charge amount information transmitted from the wireless signal reception block 210 to subtract '1' and the counter value stored in the pager. Compares the last digit converted to a decimal number to match.

Accordingly, when the comparison result of the sequence number information and the counter value does not match, the CPI 223 generates a counter value error signal (eg, '2004') and transmits the radio signal receiving block 210 through the air interface unit 221. By transmitting to the display unit 213 and the tone signal generation unit 214 therein, the subscriber is notified that a counter value error has occurred.

On the contrary, if the comparison result between the sequence number information and the counter value is identical, the CPI 223 converts the last digit of the decimal value of the counter value stored in the pager into hexadecimal and converts the value to the wireless signal receiving block 210. After subtracting from the transmitted value, the inverse transform of the random function function is performed on the subtracted result.

Thereafter, the CPI 223 decrypts the data position information and discards the random number if it is present.

The number of digits in the final encrypted value of the total amount in the secondary transmission signal may vary depending on the amount of charge in the primary transmission signal, so the number of digits in the final encrypted hexadecimal number for the 4-bit data position information following the checksum 6 bits. 8 is converted to and transmitted as shown in the example of FIG. 8, and thus, after decrypting the data position information in the decryption process, the number is taken and the rest is not a random number.

Thereafter, the CUI 223 performs a specific bit inverse conversion of a specific digit on the result value of the previous process and takes a (16 ^ r −1) complement on the remaining digits except the first digit.

Thereafter, the CPI 223 performs reverse inversion of specific digits with respect to the result value of taking the (16 ^ r −1) complement.

At this time, the CPI 223 converts the last digit of the decimal conversion value of the number of charges into a decimal number, multiplies the '1111 (DEC)', and subtracts the result of the conversion from the inverse transform value of the previous process.

Thereafter, the CPI 223 divides the subtraction result obtained in the previous process by the sum of the hexadecimal digits of each recognition name and determines whether the remainder is '0'.

In this case, if the remainder is '0', it is determined that there is no operation error, and the CPI 223 converts the result of the quotient into a decimal number and the result is converted into a specific 3-digit value (DEC) in the encryption process. Since the total amount of charges is subtracted, the total amount of charges up to a predetermined time is obtained by subtracting from the specific 3-digit value (DEC) again.

Accordingly, the CPI 223 determines whether the sum of the amount restored in the primary transmission signal and the sum of the amounts charged in the memory block 230 and the sum amount restored in the secondary transmission signal match.

Accordingly, if the sum amounts coincide, the CPI 223 stores the current charge amount restored from the primary transmission signal in the memory block 230 and increases the counter value of the number of charges by '1'.

On the other hand, the above encryption and decryption process can be applied to both the POCSAG radio calling method and the FLEX (FLEXible high speed paging) method.

First, the components of the number transmission information according to the POCSAG standard is the same as the illustration of FIG. 4 and the transmission structure is the same as the illustration of FIG.

At this time, the encryption of the position information and the sequence information in the encryption process, as shown in the example of Figure 8 (a), the first bit to the fourth bit, the second bit to the third bit, the third bit to the first bit In this case, the 4th bit is converted into the 2nd bit and '1' is converted to '0' and '0' is converted to '1' for each bit.

The components of the text transmission information according to the POCSAG standard are the same as those of FIG. 6, and the transmission structure is the same as the example of FIG. 7.

Where 'SO; 'Shift Out / English' indicates the start of the ASCII code. Shift In / Hangul 'indicates the starting point of Korean code.

At this time, the encryption of the position information and the sequence information in the encryption process, as shown in the example of Fig. 8 (b), the upper three bits are fixed, the fourth bit is the seventh bit for the lower four bits, the fifth bit is The 6th bit, the 6th bit is the 4th bit, the 7th bit is the 5th bit, and the order is converted to '0' and '0' is converted to ASCII code value for each bit. do.

Therefore, during the decoding process, the transmission pattern of 14 bits is checked to determine whether the charge amount is data, and the charge amount is confirmed by decoding the 48 bits following the data position information.

In addition, the high-speed radio calling (FLEX) method was developed by Motorola and is currently selected as a domestic standard method.It is currently in service, and it provides high-speed transmission, error correction performance, extended battery life and system scalability compared to the POCSAG method. That's the way.

The signal transmission form of the fast radio call method is illustrated in FIG. 9.

Here, 'Cycle' is a cycle of 4 minutes with 15 cycles repeated every hour from hourly cycle '0' every hour. 'Frame' is a transmission unit. 128 frames with a frame length of 1.875 sec. In one cycle, 'Block' is a basic unit of data transmission. In the case of 1600bps, 8 codewords (8 * 32 bits), 16 codewords in 3200bps, and 32 codewords in 6400bps are transmitted.

At this time, the structure of the frame is as shown in FIG.

Here, 'Sync1' is transmitted at 1600bps speed with 2-level FM modulation and informs the synchronization and data type and modulation of the whole system.

In addition, 'FI (frame information)' is a 32-bit codeword transmitted at a two-level FM modulated 1600bps rate, 'Sync2' is synchronization time information for a high-speed frame, and 'BI (block information)' is a frame. There must be one in the frame, and 2,3,4 BI includes roaming system information, time information, and calendar information.

In addition, an 'Addr Field' is classified into a short address of 1 word and a long address of 2 words, and a 'Vector Field' starts at a location designated by BI and has a one-to-one relationship with an address field. Indicates the start word and message length of the associated message, the 'Message Field' contains the message word specified by the vector field, and the 'Idle Block' is an unused block of '1' and '0' Alternately use the pattern of.

In the embodiment of the present invention, the format shown in Fig. 11 is used as the basic transmission form.

In determining that the call is a high-speed numeric radio call using the basic transmission format, it is determined as bits 5, 6, and 7 (V_0, V_1, and V_2) in the vector field. The (message field) is shown in the example of FIG. 12 and the data extraction process is shown in the signal flowchart of FIG.

Also, in determining that the call is a fast text radio call, it is determined as bits 5, 6, and 7 (V_0, V_1, and V_2) in the vector field. The components of the transmission information are shown in the example of FIG. 13 is the same as in the example of FIG.

As described in detail above, the present invention can separate the signals according to the transmission pattern to ensure the independence of the general call and the charge amount, and also to secure the safety and security of the amount transmission by the primary and secondary signal transmissions. It works.

In particular, the present invention has an effect of improving the reliability and security of charging the amount by applying a double encryption technique for each transmission signal.

Claims (3)

A method for storing an amount of money in an electronic card by wireless communication, the method comprising: firstly encrypting an amount to be charged first and then transmitting the second amount by encrypting a total amount of a predetermined number of charges including a current amount to be charged; And a third step of decoding the total amount of the predetermined number of times, including the amount to be charged currently and the amount to be charged, from the primary and secondary transmission signals, and the predetermined number of times stored in the card. Performing a fourth step of determining whether the total amount of the charged amount and the current amount to be charged matches the total amount decoded from the secondary transmission signal, and storing the current amount to be charged on the card only when the total amount is matched; Security method when charging amount. The method of claim 1, wherein the first and second transmission signals include a user identification name, a chip identification name, and a number of charges. The method of claim 1, wherein the first and second steps include: a first encryption by adding a user identification name and a chip unique identification name to the transmission data and performing first-order encryption on position conversion of a specific digit and a complement operation on a specific bit of a specific digit And a second conversion step of secondly encrypting the first converted information into a random function determined according to the number of transmissions, respectively.