KR20060034338A - Method for transmitting and receiving encryption message in mobile phone - Google Patents

Abstract

The present invention provides a method for encrypting and transmitting a text message according to a predetermined password at a transmitting terminal, and reading a received message by decrypting an encryption code of the receiving message using a password input by a user at the receiving terminal. A first step of setting a number input by a user as a password for encrypting the message and decrypting the encrypted message; When the user inputs a message to the transmitting terminal and instructs the message to be encrypted and transmitted, the transmitting terminal encrypts the input message using the set password and transmits the received message to the receiving terminal; And a third step of decrypting the encrypted message received from the transmitting terminal by using the password inputted by the user and displaying the received message.

Password, text message, send, receive, terminal

Description

Method for transmitting and receiving encryption message in mobile terminal {Method for transmitting and receiving encryption message in mobile phone}             

1 is a block diagram of a mobile communication terminal to which the present invention is applied.

2 is a flowchart illustrating a method for transmitting and receiving an encrypted message of a mobile communication terminal according to an embodiment of the present invention.

3A and 3B illustrate screens for explaining a process of transmitting and receiving an encrypted message of a mobile communication terminal according to the present invention.

Explanation of symbols on the main parts of the drawings

10: keypad 20: memory

30: control unit 40: LCD screen

50: radio frequency processor 60: speaker

70: microphone

The present invention relates to a method for transmitting and receiving an encrypted message of a mobile communication terminal, and in particular, a sender terminal encrypts and transmits a text message according to a predetermined password, and uses a password input by a user at a receiving terminal. The present invention relates to a method of reading a received message by decrypting an encryption code.

Recently, although a mobile communication terminal provides various additional services, users are mainly provided with a call service or a short message service (SMS) through the mobile communication terminal. In the case of the call service, since the sender confirms the receiver through a direct voice call and exchanges secret contents by voice, secret information between the sender and the receiver of the mobile communication terminal is rarely leaked to the outside.

However, when the sender sends the text message to the receiving terminal, the receiving terminal immediately displays the received text message on the LCD screen, so that a third party other than the user of the terminal can easily check the received text message. Accordingly, in the short message service method provided on the conventional mobile communication terminal, there is a problem in that confidential information between the sender and the receiver is easily leaked to the outside.

In order to solve this problem, Patent Application No. 2001-0042574 proposed a method for transmitting and receiving a short message with a secret attribute on a mobile communication terminal.

The caller uses the keypad to select a menu for sending the short message. Then, the controller gradually displays a screen for inputting the message content, the receiver's telephone number, and the caller's telephone number on the display unit, and receives the corresponding contents from the user. The sender writes out the contents of the message to be sent, and inputs the other party's phone number and the telephone number to be contacted. Then, the control unit displays the letter attribute setting menu on the display unit. In the letter attribute menu, there are 'normal letter', 'urgent letter', 'quick letter' and secret letter ', and the short message is sent according to the letter attribute selected by the user.

The user selects 'secret letter' among the letter attributes and sends a short message. When the receiver's mobile communication terminal receives the short message, the controller determines whether the attribute of the received short message is a secret message. If the received short message has a secret letter attribute, the control unit notifies the display of the arrival of the secret letter, and if the user wants to see the short message, pressing a predetermined message view button displays a password input screen. When the receiver inputs the password, the controller performs a procedure of confirming the password input by the receiver by referring to the memory. In the memory, a user of a mobile communication terminal stores a password for short message security or a password for setting an existing lock function in advance. The procedure for confirming a password includes a password inputted by a controller and a password stored in a memory. This is done by searching for a match.

If, as a result of the password confirmation procedure of the control unit, the password input by the receiver is different from the password stored in the memory, a screen requesting to re-enter the password is displayed. If the control unit matches the password stored in the search result memory of the password input by the receiver, the controller displays the corresponding short message on the display unit. In addition, when the recipient deletes the short message with the secret letter attribute, the recipient deletes the password after confirming the password. In this case, after the receiver confirms that the secret letter has arrived, pressing the predetermined delete button provided on the keypad confirms the password and then deletes the short message.

However, in the case of the conventional short message transmission and reception method as described above, since the short message sent from the transmitting terminal is not encrypted and is transmitted in the same manner as the general short message, the short message is completely secure. I don't have it

The present invention has been made to solve the above problems, and transmits the encrypted text message according to a predetermined password in the transmitting terminal and decrypts the encryption code of the receiving message using the password input by the user in the receiving terminal The purpose is to provide a method for reading a received message.

Another object of the present invention is to decrypt and read the encrypted message transmitted from the sending terminal according to the password input by the user in the receiving terminal, the user can maintain the security of the secret information sent and received through the mobile communication terminal To provide a method.

Another object of the present invention is to set a password on the mobile communication terminal for transmitting and receiving users to encrypt and decrypt the message, so that the password for decrypting the encryption code of the received message is stolen by a third party. It provides a way to prevent this from happening.

It is still another object of the present invention to provide a method for verifying a password by inputting a predetermined boilerplate to a mobile communication terminal when a user of a sending side or a receiving side does not remember a password for encrypting and decrypting a message.

In order to achieve the above object, the present invention provides a method in which a transmitting terminal encrypts and transmits a message, and a receiving terminal decrypts and reads an encrypted reception message, according to a user's instruction. The first step of setting the number input by the user as a password for encrypting the message and decryption of the encrypted message; If a user inputs a message to the sender terminal and instructs the message to be encrypted and transmitted, the second terminal encrypts the input message using the set password and transmits the message to the receiver terminal; And a third step of the receiving terminal decoding the encrypted message received from the transmitting terminal using the password input by the user and displaying the received message.

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

1 is a block diagram of a mobile communication terminal to which the present invention is applied.

Referring to FIG. 1, a mobile communication terminal to which the present invention is applied includes a keypad 10 for inputting user commands and various user commands related to transmission and encryption of a text message, and encryption of a text message or an encryption code of a text message. Memory 20 for storing the password for decryption of the various information and additional service information, such as phone number, and encrypts and transmits the text message according to the user's instructions input through the keypad 10, the keypad 10 Decrypting the encryption code of the received message using the password input through the control unit 30 for controlling the call service and the provision of various additional services, and displaying the text message and various information delivered by the control unit 30 The liquid crystal display (LCD) 40 and the baseband signal transmitted by the control unit 30 is converted into a high frequency signal and transmitted to the outside and the base station A radio frequency processor 50 for converting a high frequency signal received through the baseband signal to be connected to the controller 30, a speaker 60 for outputting a sound signal transmitted by the controller 30 to the outside, and A microphone 70 is provided for receiving a sound signal from the microphone.

The keypad 10 receives a password for encrypting a text message or decrypts an encrypted received message and transmits the password to the controller 30, receives a user command regarding transmission and encryption of the text message, and transmits the received password to the controller 30. It also receives user commands for calls and the use of various supplementary services.

The memory 20 stores an execution program related to providing a call and various additional services, and stores a program for encrypting and decrypting a text message according to the present invention.

The control unit 30 controls the provision of the call and various additional services and the transmission and encryption of the text message according to the user's instruction input through the keypad 10. The operation thereof will be described in detail as follows.

When a user inputs a password for encryption of a text message or decryption of an encryption code through the keypad 10 and instructs setting of the password, the controller 30 stores the input password in the memory 20.

When the user inputs a text message using a key and instructs the message to be encrypted and transmitted, the controller 30 encrypts the input message according to the password stored in the memory 20 and transmits the encrypted message.

When the encrypted text message sent from the counterpart terminal is received through the RF processor 50, the controller 30 decodes the encryption code of the received message using the password stored in the memory 20 and displays the received message on the LCD screen 40. Display).

A process of executing a method for transmitting and receiving an encrypted message according to the present invention on a mobile communication terminal having such a configuration will be described in detail with reference to FIG. 2.

Referring to FIG. 2, first, two or more mobile communication terminals used by different users set a password for encrypting a text message and decrypting an encryption code. When the menu item related to the setting is selected (S201), each terminal sets a password input mode (S202).

In the password input mode, when each user presses a numeric key to input a password, for example, "1234" and instructs the setting of this number (S203), each user's terminal encrypts the entered number in a text message and an encryption code. Set as a password for decryption (S204). Here, the password is set to 4 digits, that is, "1234", but is not limited thereto.

In addition, each user stores a phone number of the other party's terminal when a password is set in his terminal. This means that the receiver checks the sender of the encrypted text message and inputs the corresponding password into the terminal to decrypt the encryption code of the received message. It is to make it possible.

In addition, each user can also store the boilerplate text when setting a password on their terminal. This boilerplate is to allow each user to check the password set in the terminal when the user does not remember the password. For example, when a user sets his terminal to the password search mode using a key and inputs a predetermined boilerplate, The terminal searches the memory, reads the password stored with the boilerplate, and displays the password on the LCD screen. That is, since the boilerplate is used for checking a password that the user does not remember, it is preferable that the boilerplate uses a phrase that is easy for the user to remember, for example, a counterpart name.

A process of transmitting and receiving an encrypted text message between a transmitting terminal and a receiving terminal having the same password set as described above will be described below.

First, when a sender, a user of the sending terminal, inputs a short message using a key (S205), selects the "message password" item as shown in FIG. 3A, and instructs encryption of the short message (S206). The inputted short message is encrypted using a predetermined password (S207). When the sender presses a key to instruct transmission, the transmitting terminal transmits the encrypted short message to the receiving terminal (S208).

Here, a method of encrypting a short message using a predetermined password by the transmitting terminal, first, the transmitting terminal converts the predetermined password into a binary number and then executes a predetermined encryption program to change the order of the converted binary numbers. Occurs. The sending terminal attaches the generated random number to the short message to encrypt the short message.

For example, when the binary number in which the transmitting terminal converts a predetermined password is "110010110111", the transmitting terminal executes a predetermined encryption program to change the order of the binary number "110010110111" to generate a random number "001111011101". The random number generated (i.e. the cipher code) is appended to the short message.

When the short message encrypted by the above method is received by the receiving terminal, the receiving terminal displays the received encryption message on the LCD screen (S209). At this time, if the user instructs the display of the received message by pressing the confirmation key (S210), the receiving terminal displays a screen window requesting the input of a password for decrypting the encryption code of the received message as shown in Figure 3b (S211). ).

In the state where the password input window is displayed as shown in the drawing, when the user inputs a predetermined password, for example, "1234" using the key (S212), the receiving terminal decrypts and decrypts the encrypted short message using the input password. It is determined whether or not (S213). If the determination result is not decrypted, the receiving terminal indicates that the output of the received message is impossible (S214).

If the determination result is decrypted, the receiving terminal displays the encrypted reception message on the LCD screen (S215).

Here, a method of decrypting a cipher code of a received message using a password inputted by a receiving terminal, first, the receiving terminal converts the input password into binary and then executes a predetermined decryption program to convert the binary number. To generate the decryption code. The receiving terminal decrypts the encryption code of the received message through the decryption code generated.

For example, when the binary number in which the receiving terminal converts the input password is "110010110111", the receiving terminal executes a predetermined decryption program to change the order of the binary number "110010110111" to generate the decryption code "001111011101". The decryption code generated as described above is the same as the encryption code of the received message, so that the receiving terminal decrypts the encrypted received message using the decryption code.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, according to the present invention, the encrypted message transmitted from the transmitting terminal is read and decrypted according to the password inputted by the user at the receiving terminal, thereby maintaining the security of secret information exchanged through the mobile communication terminal. In addition, it is possible to prevent the password from being stolen by third parties by arbitrarily setting the password used therefor.

Claims (8)

In a method in which a transmitting terminal encrypts and transmits a message, and a receiving terminal decrypts and reads the encrypted receiving message. In response to a user's instruction, the transmitting terminal and the receiving terminal set a number input by the user as a password for encrypting the message and decrypting the encrypted message; If a user inputs a message to the sender terminal and instructs the message to be encrypted and transmitted, the second terminal encrypts the input message using the set password and transmits the message to the receiver terminal; And The receiving terminal decrypts an encrypted message received from the transmitting terminal using a password input by a user and displays a receiving message; Method of transmitting and receiving an encrypted message comprising a. The method of claim 1, In the first step, when the password is set in the transmitting terminal and the receiving terminal, a commercial phrase is also stored, characterized in that for transmitting and receiving encrypted messages. The method of claim 2, When the user inputs the boilerplate and requests confirmation of the password, the transmitting terminal or the receiving terminal displays the password stored together with the boilerplate on the LCD screen. The method of claim 1, In the second step, the transmitting terminal transmits and receives an encrypted message by converting a predetermined password into a binary number and then executing a predetermined encryption program to change the order of the converted binary numbers to generate an encryption code. . The method of claim 4, wherein And said transmitting terminal transmits an encrypted message by attaching said generated encryption code to said input message. The method according to any one of claims 1 to 5, In the third step, the receiving terminal transmits and receives an encrypted message by converting the input password into a binary number and then executing a predetermined decryption program to change the order of the converted binary numbers to generate a decryption code. Way. The method of claim 6, And the receiving terminal displays the received message if the generated decryption code and the encryption code of the received message are the same. The method of claim 6, And if the decryption code generated and the encryption code of the received message do not match, the receiving terminal indicates that output of the received message is impossible.

Images