JP2010160620A - Communication terminal, method of preventing unauthorized transfer of electronic mail in the same, and program for preventing unauthorized transfer of electronic mail in the communication terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication terminal for preventing a third party who has found a communication terminal from leaking mail information in the communication terminal having a function for quoting past transmission/reception mails for transferring mails. <P>SOLUTION: It is determined whether the destination of a mail coincides with the transmission source or destination of a mail in a quotation origin when creating a mail to which a quotation or a quotation file has been added by quoting past transmitted or received mails (steps 105, 114). When they do not agree, mail creation processing is suspended (step 106). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a communication terminal having a communication function, and in particular, an e-mail transmission / reception method, an e-mail transfer control method for a communication terminal, and an unauthorized e-mail transfer prevention program for a communication terminal.

2. Description of the Related Art In recent years, portable terminals having a wireless communication function have been popularized in accordance with the reduction in size and weight of communication terminals and the spread of wireless communication lines. A mobile terminal having a wireless communication function has a data communication function in addition to a voice communication function by telephone, and transmits / receives e-mail (hereinafter simply referred to as mail), browses a website on the Internet, and the Internet. It is used for various purposes such as merchandise transactions using shopping. In particular, technological development related to mail transmission / reception is particularly active, and not only can a document be transmitted to a desired destination, but image data other than the document can be attached to the mail as a so-called attached file. .

In addition, the received mail can be transferred to a third party as necessary, or the received mail can be quoted and a message can be added to the third party after being copied in addition to the received text.

Along with the development of e-mail transmission / reception technology using such a mobile terminal, opportunities for transmitting / receiving personal information and business-related information using, for example, a mail function of a mobile phone, which is one of the mobile terminals, are increasing. Since the service provision range of the wireless communication line used by the mobile phone is very wide, the user of the mobile phone can easily send and receive e-mails including personal information and business-related information wherever they are.

With the improvement of the convenience of such mobile phones, so-called corporate mobile phones in which corporate employees exchange information with mobile phones, not for personal use, are becoming popular. In addition, cellular phones that link with computers having a wired communication function and perform mail transmission / reception in conjunction with Internet mail transmitted / received by the computer have become widespread. With the widespread use of these mobile phones, opportunities for sending or receiving e-mails to a large number of destinations have greatly increased.

With the spread of the mail function of mobile phones, information leakage caused by loss of mobile phones has become a problem in recent years. When a lost mobile phone is picked up by a third party, the image data attached to the e-mail is transferred or copied from the third party to another third party, as well as the text of the mail received or transmitted by the mobile phone. There is a risk of information leakage.

In addition, the mail transmitted by the mail sender is stored in a mail server on the Internet. Then, when the recipient acquires the stored mail, the mail is transmitted and received. Due to such a series of processes, once the mail is sent, the mail sender cannot cancel the mail transmission or change the text. Therefore, there is a problem that information leakage occurs when mail is forwarded by specifying an incorrect destination, or when a mail reply with a quote is added to the wrong destination. Since the transmission of mail can specify a large number of destinations at the same time, if the mail is mistakenly sent to a large number of destinations, the influence of information leakage becomes large.

In order to solve these problems, there is a demand for the development of a technique for preventing mail transfer and storage by a third party and inadvertent mail transfer. As an example, by sending an email with a so-called forwarding prohibition flag that the email sender forbids email forwarding by the email recipient, forwarding the email with the forwarding prohibition flag added, and saving the email body and attached file The technique to control is open | released (for example, refer patent document 1). In addition, a condition for prohibiting mail transfer is set in advance in the transfer prohibition condition table. In addition, a technique for controlling not to transfer a mail satisfying a preset condition such as a mail from a destination including a specific domain or a mail that arrives at a specific time has been disclosed (for example, Patent Document 2). reference).

JP 2004-151783 A JP 2002-288087 A

However, when a mail using the technique disclosed in Patent Document 1 is transmitted to, for example, a large number of destinations, it is necessary to assign a transfer prohibition flag corresponding to each destination, and a complicated operation is required for the mail sender. Required. Further, in the mail transfer prohibition setting according to Patent Document 2, it is necessary to specify in advance a destination for which transfer is permitted or a destination for which transfer is prohibited, which may impair the convenience of the user.

By the way, if you predict the act of leaking information by forwarding the incoming mail or outgoing mail of the mobile phone picked up by a third party, edit and change the destination so that the forwarded mail does not reach the original mail sender It seems that the mail is forwarded after that. From these characteristics, if the mail transfer is controlled depending on whether the destination of the mail to be transmitted has been edited or changed, it is possible to prevent information leakage without performing complicated settings.

The present invention has been made to solve the above problems, and when creating a mail with a quote or a quote file added, the mail is sent to a different address from the address given to the quoted mail. Provided are a communication terminal for preventing a situation, a method for preventing unauthorized transfer of electronic mail in a communication terminal, and a program for preventing unauthorized transfer of electronic mail in a communication terminal.

In order to achieve the above object, the present invention provides input means for inputting figures, characters or instructions,
A communication means for communicating through a telecommunication line; an e-mail receiving means for receiving an e-mail transmitted via the telecommunication line; and an e-mail created using the input means. An e-mail transmitting means for transmitting via the communication means; a storing means for storing a transmitted mail transmitted by the e-mail transmitting means or a received mail received by the e-mail receiving means; and When creating a new outgoing mail by quoting the contents of the stored outgoing mail or the received mail, if the destination is different from the destination given to the cited outgoing mail or the received mail, And an e-mail creating means for interrupting the creation of a new outgoing mail.

The method for preventing unauthorized transfer of electronic mail of a communication terminal according to the present invention includes an input means for inputting graphics, characters or instructions, a communication means for communicating via an electric communication line, and transmitted via the electric communication line. An electronic mail receiving means for receiving the received e-mail via the communication means, and an e-mail transmitting means for sending an e-mail created using the input means via the communication means. A method of preventing unauthorized transfer of mail, wherein the transmitted mail transmitted by the electronic mail transmitting means or the received mail received by the electronic mail receiving means is stored in a storage means, and the display means and the input means are used. A new outgoing mail is created, and the new outgoing mail is created by quoting the contents of the outgoing mail or the received mail stored in the storage means. When the case of a different destination than the cited outgoing mail or destination that is given to the received mail is characterized by interrupting the creation of the new outgoing mail.

In addition, the electronic mail unauthorized transfer preventing program of the communication terminal according to the present invention is transmitted via the telecommunication line, the input means for inputting graphics, characters or instructions, the communication means for performing communication via the telecommunication line. An electronic mail receiving means for receiving the received e-mail via the communication means, and an e-mail transmitting means for sending an e-mail created using the input means via the communication means. A program for preventing unauthorized transfer of mail, a storage function for recording a transmission mail transmitted by the electronic mail transmission means or a reception mail received by the electronic mail reception means in a storage means, the display means and the input means A function for creating a new outgoing mail using the outgoing mail stored in the storage means or the incoming mail. When you create the new outgoing mail with reference to the content,
It has an e-mail creation function for interrupting the creation of the new transmission mail when the destination is different from the address given to the quoted transmission mail or the reception mail.

According to the present invention, when a mobile terminal transmits a mail with a quote or a quote file added, the mobile terminal checks the destination of the mail transmission. If the destination of the email transmission includes a source other than the source of the email that is the citation source or a destination other than the destination, the forwarding of the email and the transmission of the quoted portion are prohibited. Thereby, it is possible to prevent the received mail from reaching an unintended third party. Furthermore, since the mail receiving side sets the mail transfer prohibition, it is possible to save the trouble of the sender's mail transfer processing setting.

The figure which shows the structure of the external appearance of the foldable mobile telephone which is an example of the portable terminal which concerns on embodiment of this invention. The figure which shows the structure of the other external appearance of the foldable mobile telephone which is an example of the portable terminal which concerns on embodiment of this invention. The figure which shows the structure inside the mobile telephone in this embodiment. The conceptual diagram of the network connection which connects the transmission side mobile telephone in this embodiment, and a reception side mobile telephone. 5 is a flowchart of processing for canceling mail creation at the time of unauthorized mail transfer according to the first embodiment of the present invention. The flowchart of the process which erases an email quotation part at the time of the unauthorized mail transfer which concerns on the 2nd Embodiment of this invention. The flowchart of the process which transmits the mail which erase | eliminated the mail quotation location at the time of the mail unauthorized transfer which concerns on the 3rd Embodiment of this invention. The example of a screen display of the main display in the transmission side mobile phone and the reception side mobile phone of each embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an external configuration of a folding mobile phone 1 which is an example of a communication terminal according to the present invention. FIG. 1A shows an external configuration of the mobile phone 1 viewed from the front when the mobile phone 1 is opened at about 180 degrees, and FIG. 1B is a side view when the mobile phone 1 is in the open state. The structure of the appearance is shown.

As shown in FIGS. 1 (a) and 1 (b), in the mobile phone 1, the first housing 2 and the second housing 3 are hinge-coupled via a hinge portion 6 at the center. And is foldable in the direction of the arrow X. At a predetermined position inside the mobile phone 1, an antenna for transmission / reception (
An antenna 21) shown in FIG. 3 to be described later is provided, and radio waves are transmitted to and received from a radio base station 84 to be described later via a built-in antenna.

The first housing 2 is composed of numeric keys from “0” to “9”, a call / incoming key, a redial key, a call end / power key, a clear key, a first menu key, and the like on the surface. An operation key 4 is provided. Further, a side key 5 including a manner mode key, a second menu key, and the like is provided on the side surface of the first housing 2. The user presses the operation key 4
Alternatively, various instructions and data are input to the mobile phone 1 using the side keys 5. For simplicity of explanation, the operation keys 4 and the side keys 5 are hereinafter collectively referred to as input means 55.

The first housing 2 is provided with a microphone 7 below the operation keys 4, and the microphone 7 collects user voice during a call.

Note that a battery 9 is attached to the first housing 2 on the back side, and when the end call / power key is pressed for a long time and the cellular phone 1 is turned on, the battery 9 supplies power to each circuit unit described later. Supply.

On the other hand, the second housing 3 is provided with a main display 10 on the front surface thereof, which can display a setting screen of a mobile phone, mail, a website, and the like. The main display 10 is a display configured by, for example, an LCD (Liquid Crystal Display) or an organic EL (Electro Luminescence). A receiver 8 is provided at the upper part of the main display 10, and the user can listen to the voice transmitted from the other party using this.

FIG. 2 is a diagram showing an external configuration when the foldable mobile phone 1 which is an example of the mobile terminal according to the present invention is folded. FIG. 2A shows an external configuration viewed from the front when the mobile phone 1 is in the closed state, and FIG. 2B shows an external configuration viewed from the side when the mobile phone 1 is in the closed state. Show.

On the surface of the second housing 3, a sub-display 11 made of, for example, an LCD is provided. For example, an antenna picture indicating the radio wave intensity level received by the mobile phone 1 and the remaining amount of the battery 9 are indicated. Battery pictogram or current time is displayed. The second housing 3
The side key 5 provided on the mobile phone 1 is provided at a position where it can be operated even when the cellular phone 1 is closed.

  FIG. 3 is a block diagram illustrating an internal configuration of the mobile phone 1 according to the present embodiment.

A radio signal transmitted from a radio base station 84 to be described later is received by the antenna 21 and then input to the receiving circuit (RX) 23 via the antenna duplexer (DUP) 22. Receiver circuit 23
The received radio signal and the local transmission signal output from the frequency synthesizer (SYN) 24 are mixed and frequency-converted (down-converted) into an intermediate frequency signal. Then, the down-converted intermediate frequency signal is demodulated by the receiving circuit 23 and output as a received baseband signal. Also, time signal information transmitted from a GPS satellite (not shown) as a radio signal is output as a received baseband signal through the same processing as the radio signal transmitted from the radio base station 84.

The reception baseband signal output from the reception circuit 23 is a CDMA (Code Div.
(Sion Multiple Access) signal processing unit 26. The CDMA signal processing unit 26 includes a Rake receiver (not shown). In this Rake receiver, a plurality of paths included in the received baseband signal are despread with each spreading code (that is, the same spreading code as the spread code of the spread received signal). Then, the signal of each path subjected to the despreading process is subjected to coherent Rake synthesis after rotating the phase. The data sequence after Rake combining is subjected to deinterleaving and channel decoding (error correction decoding), and then binary data determination is performed. As a result, the CDMA signal processing unit 26 generates received packet data in a predetermined transmission format. The received packet data is input from the CDMA signal processing unit 26 to the compression / decompression processing unit 27. The CDMA signal processing unit 26 is a DSP.
(Digital Signal Processor).

The compression / decompression processing unit 27 separates the received packet data output from the CDMA signal processing unit 26 for each medium such as an audio signal, a data signal, or time signal information transmitted from the GPS by a demultiplexing unit (not shown). The decryption process is performed corresponding to the separated media.

On the other hand, the user's voice signal input to the microphone 7 is amplified to an appropriate level by the transmission amplifier 30 and then PCM-encoded by the PCM codec 28. This PCM
The encoded digital audio signal is input to the compression / decompression processing unit 27. Also,
A data signal such as a mail generated by the control unit 31 is also input to the compression / decompression processing unit 27.

The compression / decompression processing unit 27 compresses and encodes the digital audio signal output from the PCM codec 28 or the data signal output from the control unit 31 in a format corresponding to a predetermined transmission data rate. Thereafter, the compression-coded signal is multiplexed according to a predetermined transmission format by a demultiplexer (not shown) and then packetized. The transmission packet data after being packetized is output to the CDMA signal processing unit 26.

The CDMA signal processing unit 26 performs spread spectrum processing on the transmission packet data output from the compression / decompression processing unit 27 to generate a spread signal. This spread spectrum process is performed using a spread code assigned to the transmission channel. The spread signal generated by the CDMA signal processing unit 26 is output to the transmission circuit (TX) 25. The transmission circuit 25 modulates the spread signal using a digital modulation method such as a QPSK (Quadrature Phase Shift Keying) method. Further, the transmission circuit 25 synthesizes the spread signal and the local transmission signal generated from the frequency synthesizer 24, and performs frequency conversion (up-conversion) into a radio signal. Then, the transmission circuit 25 amplifies the radio signal that has been up-converted so as to satisfy the transmission power level instructed by the control unit 31. This amplified radio signal is
The signal is supplied to the antenna 21 via the antenna duplexer 22, and a radio signal is transmitted from the antenna 21 toward a radio base station 84 described later.

The mobile phone 1 is provided with a clock signal generator (timer) 39 that calculates a predetermined period and supplies a clock signal to the control unit 31 at each predetermined period. The power supply circuit 34 provided in the mobile phone 1 supplies a predetermined operation power supply voltage vcc generated by analog / digital conversion of the analog voltage output of the battery 9 to each circuit unit described above.

The control unit 31 includes a CPU (Central Processing Unit), a ROM
(Read Only Memory) and RAM (Random Access)
Memory). The CPU executes processing according to a program stored in the ROM or various application programs loaded in the RAM. Further, the CPU processes signals supplied from each circuit unit described above, generates various control signals, and supplies them to each circuit unit. Through these processes, the CPU comprehensively controls the mobile phone 1. The RAM stores data necessary for the CPU to execute various processes. In addition, the control unit 31 includes a video RAM (not shown), and stores information related to video displayed on the main display 10. The storage unit 32 is, for example, a flash memory element that is an electrically rewritable or erasable nonvolatile memory, or an HDD (Hard).
Disc Drive) and the like. The storage unit 32 stores various application programs and data groups that are executed by the CPU of the control unit 31. In addition, a predetermined number (eg, 100) of past received mails and outgoing mails are stored in the storage unit 32. The mail address of the other party (transmission destination or transmission source) is given to the received mail and the transmitted mail.

Next, a functional configuration of the mobile phone according to the embodiment will be described. The cellular phone according to the embodiment includes a mail receiving unit 51, a mail creating unit 52, a destination instruction unit 53, and a mail transmitting unit 54. Note that the functional configuration described here is not limited to this, and some of the components may be eliminated or added. Further, the constituent elements described here may be configured by either software or hardware.

The mail receiving unit 51 receives the received mail 50 output from the compression / decompression processing unit 27 to the control unit 31 and outputs it to the storage unit 32.

The mail creation means 52 creates the text of the outgoing mail according to the user's instruction. Further, in response to a user instruction, a process of adding a past received mail stored in the storage unit 32 or a duplicate of the transmitted mail as a transmitted mail body is performed.

The destination instruction means 53 sets the destination of the outgoing mail according to the user's instruction. The user can directly input the destination address, or input the address by referring to the phone book stored in the storage unit 32, stored in the storage unit 32, or the destination address referring to the sender address of the received mail 50 stored in the storage unit 32.
Set the destination of outgoing mail.

The mail transmission means 54 reads the mail created by the mail creation means 52 described above,
The data is transmitted to the destination designated by the destination designation unit 53.

FIG. 4 shows a connection between the mobile phone 70 on the mail transmitting side and the mobile phone 71 on the mail receiving side.
It is the conceptual diagram which showed network A (80) and B (90) connection. Each network A (8
0) and B (90) are at least exchange devices A (87) and B (97) and mail server A (8).
6), B (96) and radio base stations A (84), B (94), control devices A (85), B (
95).

The radio base stations A (84) and B (94) modulate a wired signal flowing between the networks A (80) and B (90) into a radio signal and transmit it to the mobile phones 70 and 71 and the like. The mobile phone 70
, 71 and the like are demodulated into wired signals and transmitted into networks A (80) and B (90).

Switching devices A (87) and B (97) design a line route to the mail transmission destination according to the destination information of the transmitted mail. Furthermore, according to the designed circuit route, network A (80),
A so-called line switching process is performed to switch the line connection between B (90) and between switching apparatuses A (87) and B (97).

The control devices A (85) and B (95) hold presence information of communication terminals including the mobile phones 70 and 71 located in the networks A (80) and B (90). In addition, Network A (
80) and B (90), and holds information relating the communication terminals including the mobile phones 70 and 71 located in the B (90) and the mail servers A (86) and B (96) providing mail service to the communication terminals. .

The mail servers A (86) and B (96) are communication terminals including mobile phones 70 and 71 located in the networks A (80) and B (90) to which the mail servers A (86) and B (96) belong. When a mail is sent to, the sent mail is temporarily stored. Furthermore, the control device A
Mail data is output to the cellular phones 70, 71, etc. in accordance with the mail data output device from (85), B (95).

Here, the transmitting mobile phone 70 belonging to the network A (80) is connected to the network B.
Processing when mail is transmitted to the receiving-side mobile phone 71 belonging to (90) will be described.

First, a mail transmission operation is performed from the transmission-side mobile phone 70 to the reception-side mobile phone 71 as the destination. The transmitting-side mobile phone 70 converts the mail into wireless packet data, and transmits the wireless packet data to the radio base station A (84). When receiving the radio packet data, the radio base station A (84) demodulates the received signal and transmits the demodulated wired packet data (hereinafter simply referred to as mail) to the control device A (85). Control device A (85) that received the mail
Is the network B (in the mail address field to which the receiving mobile phone 71 belongs)
90).

When the control device A (85) recognizes the address of the network B (90), the mail server B (96) is sent to the control device B (95) belonging to the network B (90).
The address inquiry signal is output. The control device B (95) receives the address inquiry signal and transmits the address information of the mail server B (96) to the control device A (95). The control device A (85) that has received the address information sends the control device A (85) and the mail server B (96).
) Is designed. For the design of a circuit route, OSPF (Open Shortest Pass Fast), which is a protocol for setting a communication cost for each circuit in advance and selecting a route that minimizes the total communication cost applied to the circuit route, is used. When the circuit path is designed, the control device A (85) transmits a mail to the switching device A (87). Switching apparatus A (87) and switching apparatus B (87) perform circuit switching processing according to the designed circuit path, and send mail to mail server B (96). Mail server B (96)
Stores the received mail in an information recording medium held by itself.

Next, the reception-side mobile phone 71 transmits a mail reception instruction to the radio base station B (94) of the network B (90). The radio base station B (94) transmits the mail reception instruction to the mail server B (96). The mail server B (96) reads the mail stored therein in response to the mail reception instruction and transmits it to the radio base station B (94). Radio base station B (94)
Transmits the mail to the mobile phone 71 on the receiving side. With the above operation, mail is transmitted and received.

The above are the radio base stations A (84), B (94), the control devices A (85), B (95),
The case where the mail servers A (86) and B (96) and the exchange devices A (87) and B (97) are configured as separate devices has been described, but some of these devices are regarded as one device. A combined configuration may be used. For example, the control device A (85) and the exchange device A (8
7) may be combined into a single device.

Next, processing when the transmitting-side mobile phone 70 transmits mail to the receiving-side mobile phone 71 using the electronic mail unauthorized transfer preventing function according to the present embodiment will be described.

(First embodiment)
In the first embodiment shown in FIG. 5, when creating a new mail with a quote or a quote file added, if a mail is sent to a destination other than the sender or the sender of the quote, The mail creation process is canceled. This prevents leakage of a quoted text or quoted file to a third party due to the cancellation of mail creation. FIG. 8 shows a screen display example of the main display 10 in the transmitting-side mobile phone 70 performed in accordance with the mail transmission process. Further, it is assumed that a predetermined number of past received mails and transmitted mails are stored in the storage unit 32 before this operation.

First, upon receiving a mail creation instruction from the input means 55, the mail creation means 52 starts a mail creation process (see step 100, the screen of FIG. 8A). Then, the mail creation means 52 receives an instruction from the input means 55 to quote mail received in the past (step 10).
1), the mail creation means 52 inputs a copy of the received mail specified in the mail text (step 102). Next, the mail creating means 52 receives the text input instruction and the destination input instruction from the input means 55, and creates a mail text (step 103) and designates a destination (step 104).

In response to the designation of the destination, the destination instructing means 53 determines whether or not the designated destination is the same as the sender of the mail that is the citation source (step 105). If the designated destination and the transmission source do not match (Yes in step 105, refer to the screen in FIG. 8C), the mail creation process is stopped (refer to the screen in step 106, FIG. 8D). On the other hand, they match (
When the mail transmission instruction is received from the input means 55 (Yes in step 107), the mail transmission means 54 sends the created mail to the radio base station A (84). ) (Step 108). If the mail sending instruction is not given by the input means 55 (No in Step 107), the mail creating means 52 returns to Step 103 and waits for the creation of the mail text and the destination designation (Step 104) again. If there is no mail transmission instruction even after waiting for a predetermined time, it may be set to automatically suspend.

Similarly, when the control unit 31 receives from the input means 55 an instruction to quote a mail transmitted in the past (Yes in Step 110), the mail creating means 52 inputs a copy of the transmitted mail specified in the mail body ( Step 111). When a copy is input to the mail body, the mail body is input by the input means 55 (step 112) and the destination is specified (step 113).
) Is performed. When the e-mail text is created and the destination is specified, the destination instructing means 53 determines whether or not the specified destination is the same as the destination of the e-mail that is the citation source (
Step 114). If they do not match (Yes in step 114, FIG. 8C)
The mail creation process is interrupted (see step 106, the screen of FIG. 8D). On the other hand, when they match (see step 114, see the screen in FIG. 8B), when the mail transmission means 54 receives an instruction for mail transmission from the input means 55 (Yes in step 115).
s), the mail transmission means 54 transmits the created mail to the radio base station A (84) (
Step 108). If the mail transmission instruction is not given by the input means 55 (No in Step 115), the mail creating means 52 returns to Step 112 and waits for the creation of the mail text and the input of the destination (Step 113) again. Similarly, if there is no mail transmission instruction even after waiting for a predetermined time, it may be set to automatically suspend.

When quoting from the past transmitted / received mail is not performed (No in Step 110), the mail body is created by the input means 55 (Step 120) and the destination is designated (Step 121). When the mail transmission means 54 receives an instruction for mail transmission from the input means 55 (Yes in step 122), the created mail is transmitted to the radio base station A (84) (step 108). If no instruction to send mail is given (No in step 122)
), The mail creation means 52 returns to step 120 and waits for the creation of the mail text and the designation of the destination (step 121) again. Similarly, if there is no mail transmission instruction even after waiting for a predetermined time, it may be set to automatically suspend.

As described above, according to the first embodiment, when attempting to send a mail with a quote or a quote file added to a destination other than the destination or source of the quote mail, the control unit 31 forcibly interrupts the mail transmission process. The By this processing, it is possible to prevent a situation in which a quote text or a quote file is transmitted to a destination other than the mail receiver or mail sender of the citation and which causes information leakage. Further, since the determination of canceling mail creation is performed using the destination information, there is no need to perform complicated individual transfer prohibition settings, and there is an advantage that convenience for the user is maintained.

(Second Embodiment)
In the second embodiment shown in FIG. 6, when creating a new mail with a quote or a quote file added, if a destination instruction is given to the destination of the mail that is the citation source or a destination other than the sender, The quoted text or the quoted file is deleted from the mail text. Thereby, leakage of the quoted sentence or the quoted file to the third party is prevented by deleting the quoted portion. Note that the same FIG. 8 is referred to for the screen display of the main display 10 in the transmitting-side mobile phone 70 performed in accordance with the mail transmission process. Before this operation,
It is assumed that a predetermined number of past received mails and transmitted mails are stored in the storage unit 32.

First, upon receiving a mail creation instruction from the input means 55, the mail creation means 52 starts a mail creation process (see step 200, the screen of FIG. 8A). The mail creation means 52 receives an instruction from the input means 55 to quote a mail received in the past (Yes in step 201).
s), the mail creation means 52 inputs a copy of the received mail specified in the mail body (
Step 202). Next, the mail creation means 52 receives the text input instruction and the destination input instruction from the input means 55, and creates a mail text (step 203) and designates a destination (step 204). In response to the creation of the mail text and the designation of the destination, the destination instructing means 53 determines whether or not the designated destination is the same as the source of the received mail that is the citation source (step 205). When the designated destination and the transmission source do not match (Yes in Step 205, refer to the screen of FIG. 8C), the mail creating means 52 deletes the quoted text or the quoted file from the mail text (Step 206). , See the screen of FIG. 8 (e)). When the mail creation means 52 deletes the quote text or the quote file, it receives a text input instruction and a destination input instruction from the input means 55 again, and creates a mail text (step 207) and designates a destination (step 208). . Thereafter, when receiving the mail transmission instruction from the input means 55 (Yes in Step 209), the mail transmission means 54 transmits the mail to the radio base station A (84) (Step 210). Alternatively, when the designated destination and the transmission source match (No in step 215, refer to the screen in FIG. 8B), the mail transmission unit 54 receives the mail transmission instruction from the input unit 55 (step 215). 209 Yes), radio base station A (
84) (step 210). If there is no mail transmission instruction even after waiting for a predetermined time, it may be set to automatically suspend.

Similarly, when the control unit 31 receives from the input means 55 an instruction to quote an email sent in the past (Yes in step 211), the email creation means 52 inputs a copy of the sent email specified in the email body (step 212). Next, the mail creation means 52 is input by the input means 55.
In response to a body text input instruction and a destination input instruction from the mail (step 213)
Then, designation of the destination (step 214) is performed. When the e-mail text is created and the destination is designated, the destination instructing means 53 determines whether or not the designated destination is the same as the destination of the outgoing mail that is the citation source (step 215). . If the designated destination does not match the destination (Yes in step 215, refer to the screen in FIG. 8C), the mail creating means 52 deletes the quoted text or the quoted file from the mail text (step 206). , FIG.
(See screen (e)). When the mail creation means 52 deletes the quote text or the quote file, it receives a text input instruction and a destination input instruction from the input means 55 again, and creates a mail text (step 207) and designates a destination (step 208). . Thereafter, when the mail transmission means 54 receives an instruction for mail transmission from the input means 55 (Yes in step 209),
A mail is transmitted to the radio base station A (84) (step 210).

When quoting from past sent / received mail is not performed (No in step 211), creation of a mail body by the input means 55 (step 207) and designation of a destination (step 208)
Is done. When receiving the mail transmission instruction from the input means 55 (Yes in Step 209), the mail transmission means 54 transmits the created mail to the radio base station A (84) (Step 210).

As described above, according to the second embodiment, when a mail with a quote or a quote file added is to be transmitted to a destination other than the mail sender or the destination, the controller 31 forcibly sends the mail quote or quote. The file is deleted. By this processing, it is possible to prevent a situation in which a quote text or a quote file is transmitted to a destination other than the mail receiver or mail sender of the citation and which causes information leakage. In addition, since the determination of erasure of the quoted sentence or the quoted file by the control unit 31 is performed using the destination information, it is not necessary to perform complicated individual transfer prohibition settings, and the convenience of the user is maintained. . Furthermore, even when the user adds a quote or a quote file and mistakenly designates a destination other than the transmission destination and the transmission source, only the quoted portion is deleted, and the user can continue to create the mail. As a result, the user does not need to re-create the mail due to a wrong address designation, and convenience is maintained.

(Third embodiment)
In the third embodiment shown in FIG. 7, when creating a new mail with a quote or a quote file added, if a destination instruction to the destination of the mail that is the citation source or other than the sender is given, the mail Sends an email with the quotes deleted when sending. That is, by sending an email in which the quoted text or the quoted file is deleted, leakage of the quoted text or the quoted file to a third party is prevented. For the screen display of the main display 10 in the transmitting-side mobile phone 70 and the receiving-side mobile phone 71 performed according to the mail transmission process, the same FIG. Further, it is assumed that a predetermined number of past received mails and transmitted mails are stored in the storage unit 32 before this operation.

First, upon receiving a mail creation instruction from the input means 55, the mail creation means 52 starts a mail creation process (see step 300, the screen of FIG. 8A). The mail creating means 52 receives an instruction from the input means 55 to quote a mail received in the past (Yes in step 301).
s), the mail creation means 52 inputs a copy of the received mail specified in the mail body (
Step 302). Next, the mail creating means 52 receives the text input instruction and the destination input instruction from the input means 55, and creates a mail text (step 303) and designates a destination (step 304). Thereafter, upon receiving a mail transmission instruction from the input means 55 (Yes in step 305), the flow proceeds to a mail transmission process. In the mail transmission process, first, the destination instructing unit 53 receives the designation of the destination, and determines whether or not the designated destination is the same as the source of the received mail that is the citation source (step 306). The mail creation means 52 determines that the designated destination does not match the transmission source (Yes in step 306, see the screen in FIG. 8C).
Deletes the quoted text or the quoted file from the mail text when the sent mail is delivered to the mail sending means 54 (step 307). Thereafter, the mail transmitting means 54 transmits the mail from which the quoted sentence or the quote file is deleted to the radio base station A (84) (see step 308, the screen of FIG. 8 (f)). Alternatively, if the designated destination and the transmission source match (No in step 306, refer to the screen in FIG. 8B), the mail transmission means 54 sends the mail with the quoted text to the radio base station A (84). (Step 308).

Similarly, when the mail creating means 52 receives an instruction to quote a previously sent mail from the input means 55 (Yes in step 310), the mail creating means 52 inputs a copy of the sent mail specified in the mail body ( Step 311). When a copy of the mail text is input, the input means 55 inputs the mail text (step 312) and specifies the destination (step 313). Thereafter, upon receiving a mail transmission instruction from the input means 55 (Yes in step 314), the flow proceeds to a mail transmission process. In the mail transmission process, as in the case of quoting the received mail, if the designated destination does not match the destination (Yes in step 315, FIG. 8 (
c), the mail creation means 52 deletes the quote or quote file from the mail text when passing the sent mail to the mail sending means 54, and the mail sending means 54 sends the mail to the radio base station A (84). ) (Step 308). Alternatively, if the designated destination matches the destination (No in step 315, refer to the screen in FIG. 8B), the mail transmission means 54 sends the mail with the quoted text to the radio base station A (84). (Step 308).

When quoting from past sent / received mail is not performed (No in Step 310), creation of a mail text by the input means 55 (Step 320) and designation of a destination (Step 321)
Is done. Then, when the mail transmission means 54 receives the mail transmission instruction from the input means 55 (Yes in step 322), the mail transmission means 54 transmits the created mail to the radio base station A (84) (step). 308).

As described above, according to the third embodiment, when an email with a quote or a quote file added is to be transmitted to a destination other than the email transmission source or the transmission destination, the control unit 31 forcibly transmits the email. The email quote or quote file is deleted and the email is sent. With this process, it is possible to prevent a situation in which a quote text is transmitted to a destination other than the mail receiver or mail sender of the citation to cause information leakage. In addition, since the determination of erasure of the quoted sentence or the quoted file by the control unit 31 is performed using the destination information, it is not necessary to perform complicated individual transfer prohibition settings, and the convenience of the user is maintained. . Further, the quotation is deleted without being notified to the screen (user) of the transmitting-side mobile phone 70. Therefore,
Even when a third party attempts to transmit a quoted sentence illegally, information leakage can be prevented without the third party noticing.

(Unauthorized e-mail transfer control by BCC address monitoring)
The interruption of the mail creation process or the process of deleting the mail quote or quote file described in the above embodiment is performed by recognizing the mail destination, but the present invention is not limited to this. For example, the above-described processing may be performed by recognizing that a destination having a BCC (Blind Carbon Copy) attribute is added among the destinations.

That is, when a destination having a To attribute and a CC (Carbon Copy) attribute is added and mail is transmitted, the sender and receiver of the mail can recognize to which destination the mail is transmitted. On the other hand, when a destination having the BCC attribute is added, the recipient of the mail cannot recognize the separately sent destination, and therefore cannot cope with the leakage of the quotation. From these characteristics, it is conceivable that a third party who has picked up the mobile phone transmits an e-mail to a destination having the BCC attribute. Therefore, by performing the illegal transfer prevention process only when a destination having the BCC attribute is added, the user does not need to perform complicated transfer prohibition setting, and information leakage using the confidentiality of the BCC attribute is performed. Can be prevented.

As described above, according to the mobile phone of this embodiment, when creating a mail with a quote or a quote file added, the sender of the mail that is the citation source or the destination of the destination and the mail being created It is determined whether or not the destination matches. If this does not match, the creation of the mail is interrupted, or the quotation is prevented from being leaked by deleting the quotation or the quotation file. By this operation, it is possible to prevent a third party who has picked up the mobile phone from causing a situation in which the internal information of the mobile phone is leaked. In addition, since it is determined whether or not to perform unauthorized transfer prevention processing using the destination information of the created mail, it is not necessary to perform complicated individual transfer prohibition settings, and user convenience is maintained. Mobile phone can be obtained.

In the embodiment described here, a mobile phone has been described. But,
The scope of the present invention is not limited to this. For example, a PDA (Personal Di)
It can also be applied to a digital assistant), a wired terminal, a small information processing device, and the like.

Further, in the embodiment, the folding mobile phone has been described as an example, but the present invention can also be applied to a slide-type mobile terminal and a bar-type mobile terminal having no movable mechanism.

The present invention is not limited to the above-described embodiment, and the constituent elements may be modified and embodied as long as they do not depart from the gist of the invention. Various inventions may be formed by proper combinations of a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in each embodiment.

DESCRIPTION OF SYMBOLS 1 Cellular phone 2 1st housing | casing 3 2nd housing | casing 4 Operation key 5 Side key 7 Microphone 8 Receiver 9 Battery 10 Main display 11 Sub display 21 Antenna 22 Antenna duplexer 23 Reception circuit 25 Transmission circuit 26 CDMA signal processing part 31 Control Unit 32 storage unit 50 received mail 51 mail receiving unit 52 mail creating unit 53 destination instruction unit 54 mail transmitting unit 55 input unit 70 transmitting side mobile phone 71 receiving side mobile phone 80 network A
84 Radio base station A
85 Controller A
86 Mail server A
87 Exchanger A
90 Network B
94 Radio base station B
95 Controller B
96 Mail server B
97 Exchanger B

Claims (10)

Input means for inputting figures, characters or instructions;
A communication means for communicating via a telecommunication line;
An e-mail receiving means for receiving an e-mail transmitted via the telecommunication line via the communication means;
An e-mail transmitting means for transmitting an e-mail created using the input means via the communication means;
Storage means for storing the outgoing mail transmitted by the electronic mail transmitting means or the incoming mail received by the electronic mail receiving means;
When creating a new transmission mail by quoting the contents of the transmission mail or the reception mail stored in the storage means, a destination different from the destination given to the transmission mail or the reception mail cited And a communication terminal having an e-mail creating means for interrupting the creation of the new outgoing mail. Input means for inputting figures, characters or instructions;
A communication means for communicating via a telecommunication line;
An e-mail receiving means for receiving an e-mail transmitted via the telecommunication line via the communication means;
An e-mail transmitting means for transmitting an e-mail created using the input means via the communication means;
Storage means for storing the outgoing mail transmitted by the electronic mail transmitting means or the incoming mail received by the electronic mail receiving means;
When creating a new outgoing mail by quoting the contents of the outgoing mail or the incoming mail stored in the storage means, the destination is different from the destination given to the cited outgoing mail or the received mail. A communication terminal comprising: an e-mail creating unit that erases and creates the content of the cited sent mail or received mail. 3. The communication terminal according to claim 2, wherein the content of the quoted transmitted mail or the received mail is erased at the stage of output to the electronic mail transmitting means. 3. The communication terminal according to claim 1, wherein the interrupting or erasing operation is performed when a destination designated by the e-mail creating unit is a BCC address. An input means for inputting a figure or a character or an instruction;
A communication means for communicating via a telecommunication line;
An e-mail receiving means for receiving an e-mail transmitted via the telecommunication line via the communication means;
An e-mail sending means for sending an e-mail created using the input means via the communication means, and a method for preventing unauthorized transfer of e-mail in a communication terminal comprising:
Storing the transmitted mail transmitted by the e-mail transmitting means or the received mail received by the e-mail receiving means in the storage means;
Create a new outgoing mail using the display means and the input means,
When creating the new outgoing mail by quoting the contents of the outgoing mail or the incoming mail stored in the storage means, an address different from the destination given to the cited outgoing mail or the received mail In such a case, the creation of the new outgoing mail is interrupted. An input means for inputting a figure or a character or an instruction;
A communication means for communicating via a telecommunication line;
An e-mail receiving means for receiving an e-mail transmitted via the telecommunication line via the communication means;
An e-mail sending means for sending an e-mail created by using the display means and the input means via the communication means,
Storing the transmitted mail transmitted by the e-mail transmitting means or the received mail received by the e-mail receiving means in the storage means;
Create a new outgoing mail using the display means and the input means,
When creating the new outgoing mail by quoting the contents of the outgoing mail or the incoming mail stored in the storage means, an address different from the destination given to the cited outgoing mail or the received mail In this case, the method for preventing unauthorized transfer of electronic mail of a communication terminal, wherein the content of the quoted transmitted mail or received mail is deleted and created. 3. The method for preventing unauthorized transfer of electronic mail in a communication terminal according to claim 2, wherein the content of the quoted transmitted mail or received mail is deleted at the stage of output to the electronic mail transmitting means. An input means for inputting a figure or a character or an instruction;
A communication means for communicating via a telecommunication line;
An e-mail receiving means for receiving an e-mail transmitted via the telecommunication line via the communication means;
An e-mail unauthorized transfer prevention program for a communication terminal, comprising: an e-mail transmitting unit that transmits an e-mail created using the display unit and the input unit via the communication unit,
A storage function for recording a transmission mail transmitted by the electronic mail transmission means or a reception mail received by the electronic mail reception means in a storage means;
A function for creating a new outgoing mail using the display means and the input means, wherein the new outgoing mail is created by quoting the contents of the outgoing mail or the received mail stored in the storage means. In this case, the communication terminal has an e-mail creation function that interrupts the creation of the new transmission mail when the destination is different from the address given to the quoted transmission mail or the reception mail. E-mail fraud prevention program. An input means for inputting a figure or a character or an instruction;
A communication means for communicating via a telecommunication line;
An e-mail receiving means for receiving an e-mail transmitted via the telecommunication line via the communication means;
An e-mail unauthorized transfer prevention program for a communication terminal, comprising: an e-mail transmitting unit that transmits an e-mail created using the display unit and the input unit via the communication unit,
A storage function for storing, in a storage unit, a transmission mail transmitted by the electronic mail transmission unit, or a reception mail received by the electronic mail reception unit;
A function for creating a new outgoing mail using the display means and the input means, wherein the new outgoing mail is created by quoting the contents of the outgoing mail or the received mail stored in the storage means. In this case, if the destination is different from the destination given to the quoted sent mail or the received email, an email creation function is created to erase and create the content of the quoted sent email or the received email. An electronic mail unauthorized transfer prevention program for a communication terminal, comprising: 10. The erasure of the contents of the quoted transmitted mail or received mail by the e-mail creating function is performed at the stage of output to the e-mail transmitting means.
E-mail unauthorized transfer prevention program for communication terminals described in 1.

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