JP4551375B2 - Message delivery system, message transfer apparatus, message transfer method, and message transfer program - Google Patents

Description

  The present invention relates to a message delivery system, a message transfer apparatus, a message transfer method, and a message transfer program for delivering a message addressed to a message address including a user identifier for identifying a user and a keyword. A message delivery system, a message transfer device, and a message transfer method that can reduce the burden of address management, easily identify a leak source and easily invalidate only the leaked message address when the message address leaks And a message transfer program.

  In recent years, with the increase in spam mail, various techniques for preventing spam mail have been developed. For example, by registering multiple keywords and using an email address that combines the registered keyword and user ID (hereinafter referred to as “keyword address”) as a valid email address, multiple email addresses can be used with a single email account. If a keyword is leaked and the keyword address is used in spam mail, a technology has been developed to prevent spam mail by invalidating only the keyword address (for example, patents) Reference 1).

  More specifically, kw1 to kwn are registered as keywords and user ID.kw1 to user ID.kwn are set as valid e-mail addresses. The keyword kwi is leaked and user ID.kwi is used in spam mail. In such a case, spam mail can be prevented by invalidating only the user ID.kwi.

JP 2003-196216 A

  However, the conventional keyword address realization method has the following two problems because it is necessary to register all effective keywords. First, in order to generate and notify different keyword addresses to the notification destination of the email address, it is necessary to register a newly generated keyword address in the server that forwards the email for each notification of the email address. There is a problem that the burden is heavy. Second, since the storage resources of the server that stores the keywords increase in proportion to the number of keywords to be registered, there is a problem that the number of keyword addresses that can be used as a mail forwarding agent is limited.

  For this reason, in a typical usage pattern, the user notifies the same keyword to a plurality of notification destinations. For example, when it is necessary to notify an e-mail address by EC (electronic commerce), all e-mail addresses having “ec” as a keyword are notified.

  As a result, there is a problem that when a mail address is leaked, it is difficult to specify the leak source. In addition, there is a problem that it is necessary to request all communication partners who have used the leaked mail address to change the mail address.

  The present invention has been made in order to solve the above-described problems caused by the prior art. The burden of managing a message address such as an e-mail address is small for a user, and when the message address leaks, It is an object of the present invention to provide a message delivery system, a message transfer device, a message transfer method, and a message transfer program that can be easily specified and can simply invalidate a leaked message address.

  In order to solve the above-described problems and achieve the object, the invention according to claim 1 is a message delivery system for delivering a message whose destination is a message address including a user identifier for identifying a user and a keyword. Corresponding to the user identifier extracted from the message address among the valid words stored in the valid word storage means. Transferability determination means for comparing each of the one or more valid words with a keyword extracted from the message address and determining that the message can be transferred when any of the valid words partially matches the keyword; It is provided with.

  Further, in the invention according to claim 2, in the above invention, the transfer permission / inhibition judging means extracts one or more valid words corresponding to the user identifier extracted from the message address from the message address. It is characterized in that it is determined that the message can be transferred when any of the valid words matches the keyword forward compared to the keyword.

  The invention according to claim 3 further comprises invalid word storage means for storing a user identifier and one or more invalid words in association with each other in the above invention, wherein the transfer permission / inhibition judging means comprises the invalid word. One or more invalid words corresponding to the user identifier extracted from the message address among the invalid words stored in the storage means are compared with the keyword extracted from the message address, and any one of the invalid words is selected. It is characterized in that it is determined that the message cannot be transferred when it completely matches the keyword.

  The invention according to claim 4 further comprises disclosure word storage means for storing a user identifier and one or more disclosure words in association with each other in the above invention, wherein the transfer availability determination means is the message address. If any one or more valid words corresponding to the user identifier extracted from the message partially match the keyword extracted from the message address, it is determined that the message can be transferred and the keyword is If registered in the disclosed word storage means and does not partially match any of the one or more valid words, the user extracted from the message address among the disclosed words stored in the disclosed word storage means Each of the one or more disclosure words corresponding to the identifier is compared with the keyword, and any of the disclosure words is completed in the keyword. And judging the message transfer allowed when matching.

  Further, in the invention according to claim 5, in the above invention, when it is determined that the message is transferred to the user by the transfer permission determination unit, the message address is rewritten to an actual address and extracted from the message address. A transfer means for transferring a keyword together with the message, a reply message to the message transferred by the transfer means is received together with the keyword, the message address is reproduced using the received keyword, and the reproduced message address is sent from the sender And a reply means for transferring a reply message.

  The invention according to claim 6 is a message transfer apparatus for transferring a message whose destination is a message address including a user identifier for identifying a user and a keyword, and the user identifier extracted from the message address One or more valid words corresponding to, and each of the obtained valid words is compared with a keyword extracted from the message address, and any of the valid words partially matches the keyword. It is characterized by comprising transferability determination means for determining that transfer is possible.

  The invention according to claim 7 is a message transfer method of a message transfer apparatus for transferring a message whose destination is a message address including a user identifier for identifying a user and a keyword, which is extracted from the message address. One or more valid words corresponding to the identified user identifier are obtained, and each of the obtained valid words is compared with a keyword extracted from the message address, and any of the valid words partially matches the keyword. A transfer permission / non-transfer determining step for determining that the message can be transferred.

  The invention according to claim 8 is a message transfer program for transferring a message whose destination is a message address including a user identifier for identifying a user and a keyword, the user identifier extracted from the message address One or more valid words corresponding to, and each of the obtained valid words is compared with a keyword extracted from the message address, and any of the valid words partially matches the keyword. The computer is caused to execute a transfer permission / inhibition determination procedure for determining whether or not a file is transferable.

  According to the first, second, sixth, seventh or eighth invention, each of the one or more valid words corresponding to the user identifier extracted from the message address is compared with the keyword extracted from the message address. Since the message is determined to be transferable when any of the words partially matches the keyword, the user can create and use a large number of keyword addresses from one valid word. Therefore, the user can easily use a different keyword address for each communication partner, and can easily specify the leakage source when the keyword address leaks. Further, it is possible for the mail transfer company to reduce the resources necessary for storing the keyword.

  According to the third aspect of the present invention, each of the one or more invalid words corresponding to the user identifier extracted from the message address among the invalid words is compared with the keyword extracted from the message address. Since it is determined that the message cannot be transferred when either of them completely matches the keyword, the user can easily invalidate only the leaked keyword address by registering it as an invalid word.

  According to the invention of claim 4, when any one or more valid words corresponding to the user identifier extracted from the message address partially matches the keyword extracted from the message address, If the message is determined to be transferable and the keyword is registered as a disclosure word and does not partially match any of the one or more valid words, one or more corresponding to the user identifier extracted from the message address Each of the disclosed words is compared with the keyword, and when any of the disclosed words completely matches the keyword, it is determined that the message can be forwarded. Therefore, even if the valid word is deleted, the deleted valid word is deleted. Since keywords including words are registered as disclosure words, the disclosed keyword addresses will continue to be used. The ability. Therefore, the user can continue to use the disclosed keyword address even when the leaked valid word is deleted.

  According to the invention of claim 5, when it is determined that the message is to be transferred to the user, the message address is rewritten to the real address, the keyword extracted from the message address is transferred together with the message, and the reply message to the transferred message Is received together with the keyword, the message address is reproduced using the received keyword, and the reply message is transferred using the reproduced message address as the transmission source. Therefore, leakage of the real address from the reply message can be prevented.

  Exemplary embodiments of a message delivery system, a message transfer apparatus, a message transfer method, and a message transfer program according to the present invention will be described below in detail with reference to the accompanying drawings. Here, the case where the present invention is applied to a mail delivery system will be mainly described.

  In the first embodiment, after describing the configuration of the mail delivery system according to the first embodiment, the processing procedure will be described focusing on the filter processing of the mail delivery system, and finally the effects of the first embodiment will be described.

[Configuration of mail delivery system (Example 1)]
First, the configuration of the mail delivery system according to the first embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating the configuration of the mail delivery system according to the first embodiment. The mail delivery system shown in the figure connects a user A terminal 220 and a user B terminal 320 via a user A side IP network 240, the Internet 400, and a user B side IP network 340. Mail delivery for delivering mail addressed to the user A230 sent from the user B terminal 320 to the user A terminal 220 via the user B mail server 310 and the user A mail server 210. System.

  The user A terminal 220 and the user B terminal 320 are terminal devices used when the user A 230 and the user B 330 exchange mail via the Internet 400, respectively, and are widely used personal computers (PC). WEB browser software and electronic mail software (mailer) are installed on the user A side IP network 240 and the user B side IP network 340 via the router R, respectively. The user A side IP network 240 and the user B side IP network 340 are connected to the Internet 400 via the router R, respectively.

  User A mail server 210 and user B mail server 310 are so-called existing mail servers. That is, the user A mail server 210 receives mail transmitted from the user A terminal 220 and transmits it to the mail destination, and also receives mail to the user A terminal 220 and transmits it to the user A terminal 220. The user B mail server 310 receives the mail transmitted from the user B terminal 320 and transmits it to the mail destination, and also receives the mail to the user B terminal 320 and transmits it to the user B terminal 320. To do. For convenience of explanation, only two terminal devices and a mail server are shown here, but this mail delivery system is composed of a large number of terminal devices and mail servers.

  In addition, this mail delivery system delivers mail addressed to a keyword address in addition to mail addressed to an actual mail address held by the user (hereinafter referred to as “real address”) itself. Here, the reason for using the keyword address is that the user may not want to disclose the real address to the communication partner. For example, if the communication partner is a mail order dealer on the Internet, if you disclose the real address unnecessarily, this real address will spread to other vendors through mailing lists, etc., and direct mail etc. that do not require users This is because there may be a situation where it is necessary to receive a call.

  In the case of a keyword address, if it seems that the correspondence between the keyword address and the callee cannot be understood at a glance, the use efficiency is low, for example, the caller makes a wrong address when creating an email. The user address and the keyword “kw” are combined with the domain name “kwmail.ne.jp” indicating the keyword address to form the destination address “userid.kw@kwmail.ne.jp”.

  Thus, in this mail delivery system, since a keyword address can be used, a mail transfer server 110 that performs filtering of mail by keyword, a word registration server 120 that performs registration processing of a word used for the keyword, and the like A data management server 130 that manages the words to be used is provided. In other words, mail having a keyword address as a destination is sent to the mail transfer server 110, and the mail transfer server 110 converts the destination into a real address and transfers it. The mail transfer server 110, the word registration server 120, and the data management server 130 are connected to a LAN 100 connected to the Internet 400 via a router R and a firewall FW.

  The mail transfer server 110 is a server device that performs a filtering process and a transfer process for mail whose destination is a keyword address, and includes a mail communication unit 111, a filter processing unit 112, and a transfer processing unit 113. Such a mail transfer server 110 can be realized by installing a program corresponding to these functional units in a commercially available PC or workstation (WS).

  The mail communication unit 111 is a processing unit that receives a mail whose destination is a keyword address from a mail server on the transmission side and transmits the filtered mail to a mail server on the reception side.

  The filter processing unit 112 is a processing unit that performs filtering of mail whose destination is a keyword address. Specifically, the filter processing unit 112 determines whether or not the keyword address of the mail destination is valid. If it is not valid, the mail is discarded.

  Here, the filter processing unit 112 determines that the keyword address is valid when a valid word is included in front of the keyword and the keyword is not an invalid word. For example, in the keyword address shown in FIG. 2, “suzuki” is the user ID and “web060620” is the keyword. If the valid word is “web”, the keyword “web060620” includes the valid word “web” in the front, so if the keyword “web060620” is not an invalid word, the keyword address “suzuki.web060620” @ kwmail.ne.jp "is determined to be valid.

  In this way, the filter processing unit 112 determines whether or not the keyword address is valid based on whether or not a valid word is included in front of the keyword (whether or not the keyword front partially matches the valid word). Therefore, it is possible to easily generate a large number of keywords by adding arbitrary words to the effective words, and it is possible to use different keywords for each communication partner. In addition, the filter processing unit 112 determines whether or not the keyword address is valid based on whether or not the keyword including the valid word is an invalid word (whether or not it completely matches the invalid word). When a keyword is leaked, only the keyword is set as an invalid word, so that other keywords having the same valid word can be used continuously. The function of the filter processing unit 112 corresponds to the transfer permission / inhibition determining unit described in the claims.

  Also, here, in order to determine whether or not the keyword address is valid based on whether or not a valid word is included in front of the keyword, this is particularly distinguished from a conventional keyword address based on complete keyword matching. The keyword address can also be called a “front matching keyword address”.

  The transfer processing unit 113 is a processing unit that changes the mail address determined by the filter processing unit 112 to be valid as a keyword address to a real address and transfers the mail address. Specifically, the transfer processing unit 113 transfers the mail by changing the destination to the real address corresponding to the user ID.

  The data management server 130 manages the valid and invalid words used by the filter processing unit 112 for the filtering process and the real addresses used by the transfer processing unit 113 for the transfer process.

  The word registration server 120 is a server device that performs processing for registering valid words, invalid words, and the like in the data management server 130, and includes an HTTP communication unit 121, a valid word registration processing unit 122, and an invalid word registration processing unit 123. Have Similar to the mail transfer server 110, the word registration server 120 can be realized by installing a program corresponding to these functional units in a commercially available PC or WS.

  The HTTP communication unit 121 is a processing unit that performs communication according to HTTP (Hyper Text Transfer Protocol). For example, the HTTP communication unit 121 receives registration requests for valid words and invalid words that are performed by a user using WEB browser software. It passes to the valid word registration processing unit 122 and the invalid word registration processing unit 123.

  The valid word registration processing unit 122 is a processing unit that accepts a valid word registration request performed by the user using the WEB browser software and registers the valid word in the data management server 130. The ID and the valid word are received and the data management server 130 is requested to register.

  The invalid word registration processing unit 123 is a processing unit that accepts an invalid word registration request performed by the user using the WEB browser software and registers the invalid word in the data management server 130. Specifically, the invalid word registration processing unit 123 registers the invalid word with the user. The ID and the invalid word are received, and the data management server 130 is requested to register.

  The data management server 130 is a server device that manages valid words, invalid words, and real addresses, and includes a real address table 131, a valid word table 132, and an invalid word table 133. Similar to the mail transfer server 110 and the word registration server 120, the data management server 130 can be realized by installing a program for managing data in a commercially available PC or WS.

  The real address table 131 is a table that stores user IDs and real addresses in association with each other. FIG. 3 is a diagram illustrating an example of the real address table 131. As shown in the figure, the real address table 131 stores the real address “suzuki1010@anywhere.ne.jp” corresponding to the user ID “suzuki” and the real address “sunaka” corresponding to the user ID “tanaka”. “taro@isp-A.ne.jp” is stored, and the real address “yamada-k@anywhere.ne.jp” is stored in association with the user ID “yamada”.

  The valid word table 132 is a table that stores a user ID and a valid word list in association with each other. FIG. 4 is a diagram illustrating an example of the valid word table 132. As shown in the figure, this valid word table 132 stores valid words “web” and “ml” corresponding to the user ID “suzuki”, and valid word “shop” corresponding to the user ID “tanaka”. And “news” are stored, and the valid words “blog”, “shopping”,... Are stored in association with the user ID “yamada”. The valid word table 132 corresponds to the valid word storage means described in the claims.

  The invalid word table 133 is a table that stores a user ID and an invalid word list in association with each other. Note that the invalid word is a keyword for which it is determined whether or not it completely matches the keyword included in the destination, unlike the valid word. FIG. 5 is a diagram illustrating an example of the invalid word table 133. As shown in the figure, the invalid word table 133 stores the invalid word “web060612” in association with the user ID “suzuki”, and the invalid word “shopABC” in correspondence with the user ID “tanaka”. The valid word “shoppingY” is stored in association with the user ID “yamada”. The invalid word table 133 corresponds to invalid word storage means described in the claims.

[Valid word registration process (Example 1)]
Next, a processing procedure of valid word registration processing by the mail delivery system according to the first embodiment will be described. FIG. 6 is a sequence diagram illustrating a processing procedure of valid word registration processing by the mail delivery system according to the first embodiment. Here, a case where user A230 registers a valid word will be described.

  As shown in the figure, in this valid word registration process, the user A terminal 220 accepts input of a registered word to be registered as a valid word from the user A 230 (step S110), and a valid word registration request is received together with the user ID and the registered word. Is performed on the word registration server 120 (step S120). For example, the user A terminal 220 makes a valid word registration request to the word registration server 120 together with the user ID “suzuki” and the registration word “ec”.

  Then, the valid word registration processing unit 122 of the word registration server 120 receives the user ID and the registered word, and requests the data management server 130 to add the registered word to the valid word list corresponding to the user ID (step). S130). When the registration to the valid word table 132 is completed, the valid word registration processing unit 122 transmits a valid word registration response to the user A terminal 220 (step S140).

  As described above, the valid word registration processing unit 122 of the word registration server 120 requests the data management server 130 to register a valid word based on a request from the user A 230, thereby registering the valid word in the valid word table 132. can do. As shown in FIG. 7, the user A230 can use the registered valid word “ec” to use the keyword address “suzuki.ec060621@kwmail.ne.jp” for inputting an EC order page. .

[Mail transfer processing (Example 1)]
Next, a processing procedure of mail transfer processing by the mail delivery system according to the first embodiment will be described. FIG. 8 is a sequence diagram illustrating a processing procedure of mail transfer processing by the mail delivery system according to the first embodiment. Here, a case will be described as an example in which the user B330 transmits an email to the user A230 using the keyword address “suzuki.ec060621@kwmail.ne.jp” notified from the user A230.

  As shown in the figure, in this mail transfer process, the user B terminal 320 receives a mail transmission request addressed to the keyword address “suzuki.ec060621@kwmail.ne.jp” from the user B330 and receives the user B It transmits to the mail server 310 (step S210). Then, the user B mail server 310 transmits the mail to the mail transfer server 110 because the transmission destination is the keyword address “suzuki.ec060621@kwmail.ne.jp” (step S220).

  Then, the filter processing unit 112 of the mail transfer server 110 that has received the mail refers to the valid word table 132 and the invalid word table 133 to perform filter processing, that is, whether to transfer the mail (step S230). Details of this filtering process will be described later.

  As a result, when the filter processing unit 112 determines that the transfer is possible, the transfer processing unit 113 refers to the real address table 131 to acquire the mail address of the transfer destination, that is, the real address (step S240), and sends the mail to the acquired real address. The address is changed and the mail is transmitted to the user A mail server 210 (step S250). Then, the mail received by the user A mail server 210 is temporarily stored.

  Thereafter, when the user A terminal 220 requests the user A mail server 210 to confirm the arrival mail based on the instruction from the user A 230 (step S260), the user A mail server 210 uses the temporarily stored mail as the user A. It transmits to the terminal 220 (step S270).

  As described above, the filter processing unit 112 of the mail transfer server 110 refers to the valid word table 132 and the invalid word table 133 to determine whether or not the mail addressed to the keyword address can be transferred, and the filter processing unit 112 determines that the transfer is possible. Only in this case, the transfer processing unit 113 refers to the real address table 131 and changes the keyword address to the real address to transfer the mail, so that it is possible to prevent the reception of spam mail and the like.

[Filter processing (Example 1)]
Next, the process procedure of the filter process (process corresponding to step S230 shown in FIG. 8) by the filter processing unit 112 will be described. FIG. 9 is a flowchart illustrating the processing procedure of the filter processing by the filter processing unit 112. Here, a case where the destination address is “suzuki.ec060621@kwmail.ne.jp” will be described as an example.

  As shown in the figure, in this filter processing, the filter processing unit 112 acquires the user ID (u) and the keyword (k) from the destination address (step S231). Here, “suzuki” is acquired as u, and “ec060621” is acquired as k.

  Then, the filter processing unit 112 acquires the valid word list WL corresponding to the user ID from the valid word table 132 (step S232). Here, it is assumed that the valid word list WL = {web, ml, ec}.

  Then, the filter processing unit 112 sets the element in the valid word list WL to w, and whether or not there is w included in the front part of the keyword k, that is, matches the keyword k forward (partly matches forward). It is determined whether or not there is w (step S233).

  As a result, when there is w included in the front part of the keyword k, the filter processing unit 112 acquires the invalid word list BL corresponding to the user ID from the invalid word table 133 (step S234). Here, it is assumed that the invalid word list BL = {web060612}.

  Then, the filter processing unit 112 sets the element in the invalid word list BL to b, and determines whether there is b that matches (completely matches) the keyword k (step S235). As a result, if there is no b that matches the keyword k, the filter processing unit 112 determines that mail transfer is possible (step S236a). On the other hand, if there is b that matches the keyword k, or if there is no w included in the front part of the keyword k, the filter processing unit 112 determines that mail transfer is not possible (step) S236b).

  As described above, when the filter processing unit 112 determines whether mail can be transferred based on whether or not there is a valid word w included in the front part of the keyword k, and determines that transfer is possible from the point of the valid word. Furthermore, by finally determining whether or not mail can be transferred based on whether or not there is an invalid word b that matches the keyword k, a large number of keyword addresses can be used with a small number of valid words, and the keyword address is leaked. In this case, it is possible to easily prevent the reception of the spam mail using the leaked keyword address.

  In this example, since the keyword “ec060621” includes the valid word “ec” and the keyword “ec060621” does not match the invalid keyword “ec060612”, it is determined that transfer is possible. Also, here, the transfer enable / disable determination based on the invalid word is performed after the transfer enable / disable determination based on the valid word. However, the transfer enable / disable determination based on the valid word is performed after the transfer enable / disable determination based on the invalid word. You can also.

[Invalid word registration process (Example 1)]
Next, a processing procedure of invalid word registration processing by the mail delivery system according to the first embodiment will be described. FIG. 10 is a sequence diagram illustrating a processing procedure of invalid word registration processing by the mail delivery system according to the first embodiment. Here, a case where the user A 230 notices that the keyword address “suzuki.ec060621@kwmail.ne.jp” has been used as a mail address of spam mail will be described as an example.

  As shown in the figure, in this invalid word registration process, the user A terminal 220 receives an invalid word to be registered as an invalid word from the user A 230 (step S310), and the invalid word along with the user ID and invalid word is received. A registration request is made to the word registration server 120 (step S320). For example, the user A terminal 220 makes an invalid word registration request to the word registration server 120 together with the user ID “suzuki” and the invalidation word “ec060621”.

  Then, the invalid word registration processing unit 123 of the word registration server 120 receives the user ID and the invalidation word, and requests the data management server 130 to add the invalidation word to the invalid word list corresponding to the user ID. (Step S330). When registration in the invalid word table 133 is completed, the invalid word registration processing unit 123 transmits an invalid word registration response to the user A terminal 220 (step S340).

  As described above, the invalid word registration processing unit 123 of the word registration server 120 requests the data management server 130 to register the invalid word based on the request of the user A 230, thereby registering the invalid word in the invalid word table 133. When a keyword address is leaked, it is possible to prevent the reception of spam mail using the leaked address.

[Effects of Example 1]
As described above, according to the first embodiment, the data management server 130 stores the valid word table 132, and the valid word that the filter processing unit 112 of the mail transfer server 110 matches with the keyword of the destination address is the valid word table. Since it is determined whether or not the mail can be transferred based on whether or not it is registered in 132, a large number of keyword addresses can be used by adding different words to the valid words. Use of different keyword addresses can be facilitated. Therefore, even when a keyword address is leaked, it is possible to easily identify the leak source.

  Further, according to the first embodiment, it is difficult to identify the effective word portion and the additional portion with respect to the effective word, and it is difficult to specify the effective word. Therefore, even when the keyword leaks, the effective word leaks. Since it is unlikely, you can continue to use other keywords.

  Further, according to the first embodiment, since it is determined whether the keyword is valid based on whether the front part of the keyword matches the valid word, an arbitrary word is added to the valid word. Keywords can be created by simply, and grouping and management of keywords can be facilitated.

  In addition, according to the first embodiment, the data management server 130 stores the invalid word table 133, and the mail that the filter processing unit 112 of the mail transfer server 110 determines to be transferable based on the valid word is sent to the destination Since it is determined whether or not mail transfer is possible based on whether or not an invalid word that matches the keyword of the address is registered in the invalid word table 133, it is possible to leak only by registering the leaked keyword in the invalid word table 133. Incoming messages such as junk mail using the selected keywords can be easily prevented.

  In the first embodiment, the filter processing unit 112 of the mail transfer server 110 determines whether or not mail can be transferred based on whether or not the keyword of the destination address and the valid word match forward. The present invention is not limited to this, and can be similarly applied when determining whether or not a valid word partially matches a keyword, such as when determining whether or not a valid word matches the rear part of a keyword. .

  By the way, in the first embodiment, a case has been described in which when a keyword is leaked, the keyword is registered in the invalid word table 133 to prevent incoming mail such as junk mail. However, not only keywords but also valid words themselves may be leaked. If a valid word leaks, it is easy to generate a keyword, and therefore there is a possibility of being attacked using various keywords. Therefore, in the second embodiment, a case where a valid word is locked when a valid word leaks will be described. Here, the lock of the valid word means that a new keyword cannot be generated from the valid word, but a keyword already in use including the valid word can be used.

  In the second embodiment, as in the first embodiment, after describing the configuration of the mail delivery system according to the second embodiment, the processing procedure will be described with a focus on filter processing, and finally the effects of the second embodiment will be described. .

[Configuration of mail delivery system (Example 2)]
First, the configuration of the mail delivery system according to the second embodiment will be described with reference to FIG. FIG. 11 is a diagram illustrating the configuration of the mail delivery system according to the second embodiment. Here, for convenience of explanation, functional units that play the same functions as the respective units shown in FIG.

  As shown in FIG. 11, this mail delivery system is provided with a mail transfer server 510 instead of the mail transfer server 110 in comparison with the mail delivery system shown in FIG. 520 is provided, and a data management server 530 is provided instead of the data management server 130. The mail transfer server 510 includes a filter processing unit 512 instead of the filter processing unit 112, and the word registration server 520 includes a valid word lock processing unit 523 instead of the invalid word registration processing unit 123, and the data management server 530 has a disclosed word table 533 instead of the invalid word table 133.

  Here, the disclosed word is a keyword disclosed to a communication partner using an effective word, and is an effective keyword even when the original effective word is locked. The disclosed word table 533 of the data management server 530 stores the user ID and the disclosed word list in association with each other. FIG. 12 is a diagram illustrating an example of the disclosed word table 533. As shown in the figure, this disclosure word table 533 stores the disclosure words “web060401”, “webR”,... Corresponding to the user ID “suzuki”, and discloses it corresponding to the user ID “tanaka”. The word “shopDEF” is stored, and the disclosure word “shoppingN” is stored in association with the user ID “yamada”.

  When the filter processing unit 512 of the mail transfer server 510 extracts the user ID and the keyword from the destination address, the filter processing unit 512 determines whether or not the keyword is registered as a disclosure word corresponding to the user ID. It is determined that the mail can be transferred. On the other hand, when the keyword is not registered as a disclosure word corresponding to the user ID, if a valid word that matches the keyword is registered as a valid word corresponding to the user ID, mail can be transferred. Determine and register the keyword as a disclosure word.

  Even when the valid word is locked by determining whether mail can be transferred based on the disclosed word and the valid word, the filter processing unit 512 continues to use only the keyword address disclosed to the communication partner before the lock. Can be possible.

  The valid word lock processing unit 523 of the word registration server 520 is a processing unit that accepts a valid word lock request performed by a user using WEB browser software and deletes a valid word from the data management server 530. Specifically, The user ID and the lock target word are received from the user, and the data management server 530 is requested to delete.

[Mail transfer processing (Example 2)]
Next, a processing procedure of mail transfer processing by the mail delivery system according to the second embodiment will be described. FIG. 13 is a sequence diagram of the mail transfer process performed by the mail delivery system according to the second embodiment. In this case as well, as in the first embodiment, an example in which the user B330 sends an email to the user A230 using the keyword address “suzuki.ec060621@kwmail.ne.jp” notified from the user A230. Will be described.

  As shown in the figure, in this mail transfer process, the user B terminal 320 receives a mail transmission request addressed to the keyword address “suzuki.ec060621@kwmail.ne.jp” from the user B330 and receives the user B It transmits to the mail server 310 (step S410). Then, the user B mail server 310 transmits the mail to the mail transfer server 510 since the transmission destination is the keyword address “suzuki.ec060621@kwmail.ne.jp” (step S420).

  Then, the filter processing unit 512 of the mail transfer server 510 that has received the mail refers to the valid word table 132 and the disclosed word table 533 to perform filter processing, that is, whether to transfer mail (step S430). Details of this filtering process will be described later.

  As a result, when the filter processing unit 512 determines that the transfer is possible, the transfer processing unit 113 refers to the real address table 131 to acquire the mail address of the transfer destination, that is, the real address (step S440), and sends the mail to the acquired real address. The destination is changed and the mail is transmitted to the user A mail server 210 (step S450). Then, the mail received by the user A mail server 210 is temporarily stored.

  Thereafter, when the user A terminal 220 requests the user A mail server 210 to confirm the arrival mail based on the instruction of the user A 230 (step S460), the user A mail server 210 uses the temporarily stored mail as the user A. It transmits to the terminal 220 (step S470).

  As described above, the filter processing unit 512 of the mail transfer server 510 refers to the valid word table 132 and the disclosed word table 533 to determine whether mail having the keyword address as a destination can be transferred, and the filter processing unit 512 determines that transfer is possible. Only in this case, the transfer processing unit 113 refers to the real address table 131 and changes the keyword address to the real address to transfer the mail, so that it is possible to prevent the reception of spam mail and the like.

[Filter processing (Example 2)]
Next, the process procedure of the filter process (process corresponding to step S430 shown in FIG. 13) by the filter processing unit 512 will be described. FIG. 14 is a flowchart illustrating the processing procedure of the filter processing by the filter processing unit 512. Here, as in the first embodiment, the case where the destination address is “suzuki.ec060621@kwmail.ne.jp” will be described as an example.

  As shown in the figure, in this filter processing, the filter processing unit 512 acquires the user ID (u) and the keyword (k) from the destination address (step S431). Here, “suzuki” is acquired as u, and “ec060621” is acquired as k.

  Then, the filter processing unit 512 acquires the disclosed word list AL corresponding to the user ID from the disclosed word table 533 (step S432). Here, it is assumed that the disclosed word list AL = {web060401, webR, ec060621}.

  Then, the filter processing unit 512 determines whether or not there is a that matches the keyword k, where a is an element in the disclosed word list AL (step S433). As a result, when there is no a that matches the keyword k, the filter processing unit 512 acquires the valid word list WL corresponding to the user ID from the valid word table 132 (step S434). Here, it is assumed that the valid word list WL = {web, ml}.

  Then, the filter processing unit 512 sets w as an element in the valid word list WL, and determines whether or not there is w that matches the keyword k (step S435). As a result, if there is w that matches the keyword k, the filter processing unit 512 adds the keyword k to the disclosure word list (step S436), and determines that the mail can be transferred (step S437a). . On the other hand, if there is no forward matching w for the keyword k, it is determined that mail transfer is not possible (step S437b). If there is a that matches the keyword k in step S433, the filter processing unit 512 determines that the mail can be transferred (step S437a).

  As described above, when the filter processing unit 512 determines whether or not to transfer the mail based on whether or not there is a disclosed word a that matches the keyword k, and further determines that the transfer is impossible in terms of the disclosed word, the keyword Whether or not mail transfer is possible is determined based on whether or not there is a valid word w that matches forward with k. If there is a valid word w that matches forward with keyword k, it is determined that mail can be transferred and the keyword k By adding to the disclosure word list, even when a valid word is deleted, the keyword disclosed before the deletion can be continuously used based on the deleted valid word.

  In this example, since the disclosure word list includes the disclosure word that matches the keyword “ec060621”, it is possible to send an email using the keyword “ec060621” even if there is no “ec” in the valid word list. It becomes. Further, here, the transfer availability determination based on the valid word is performed after the transfer availability determination based on the disclosed word. However, the transfer availability determination based on the disclosed word is performed after the transfer availability determination based on the valid word. You can also.

[Valid word lock processing (Example 2)]
Next, a processing procedure of valid word lock processing by the mail delivery system according to the second embodiment will be described. FIG. 15 is a sequence diagram illustrating the processing procedure of the valid word lock processing by the mail delivery system according to the second embodiment. Here, a case where the user A 230 notices that the valid word “web” has leaked will be described as an example.

  As shown in the figure, in this valid word lock process, the user A terminal 220 receives an input of a valid word to be locked from the user A 230 (step S510), and sends a valid word lock request together with the user ID and the lock target word to the word. This is performed for the registration server 520 (step S520). For example, the user A terminal 220 makes a valid word lock request to the word registration server 520 together with the user ID “suzuki” and the lock target word “web”.

  Then, the valid word lock processing unit 523 of the word registration server 520 receives the user ID and the lock target word, and requests the data management server 530 to delete the lock target word from the valid word table 132 corresponding to the user ID. (Step S530). When the deletion from the valid word table 132 is completed, the valid word lock processing unit 523 transmits a valid word lock response to the user A terminal 220 (step S540).

  In this way, when the valid word lock processing unit 523 of the word registration server 520 requests the data management server 530 to lock the valid word based on the request of the user A230, the valid word is leaked. A word can be locked.

[Effects of Example 2 and the like]
As described above, according to the second embodiment, the disclosed keyword is stored in the disclosed word table 533 of the data management server 530, and the filter processing unit 512 of the mail transfer server 510 extracts the keyword extracted from the keyword address of the mail. Even when a valid word that matches forward is not registered in the valid word table 132, if there is a keyword that matches the disclosed word table 533, it is determined that mail transfer is possible, so the valid word is locked. When a valid word is leaked, it is possible to make it impossible to use a new keyword using the leaked valid word and to enable continuous use of the disclosed keyword.

  In addition, by adding a function unit that deletes a keyword registered in the disclosed word table 533 based on an instruction from the user to the word registration server 520, when the disclosed keyword is leaked, the keyword cannot be used. It can also be done.

[Other examples]
In the first and second embodiments, the case where mail is transmitted to the keyword address user has been described. However, when the user who has received the keyword address mail returns as it is, the real address of the user is transmitted as a reply mail. It will be disclosed as the original address. Therefore, when a mail with a keyword address is received and a reply is required, the user needs to create and send a new mail, which places a burden on the user. Therefore, a mail transfer server that prevents the real address from being disclosed even when the user who received the keyword address mail returns as it is will be described with reference to FIG.

  FIG. 16 is an explanatory diagram for explaining a mail transfer server capable of preventing disclosure of an actual address by a reply mail to a keyword address mail. As shown in the figure, the mail transfer server 610 executes the keyword address “rid.kw@kwmail.ne.jp” when receiving the mail having the keyword address “rid.kw@kwmail.ne.jp” as the destination address. It is rewritten to the address “run @ rdomain” and transmitted to the keyword address user R. At this time, the mail transfer server 610 rewrites the real address “sun @ sdomain” of the mail sender into the format of “sun/sdomain/kw@kwmail.ne.jp” (hereinafter referred to as “reply format”). Send email from.

  When the reply mail for the keyword address mail is received, the keyword "kw" is extracted from the reply destination address "sun/sdomain/kw@kwmail.ne.jp" and corresponds to the reply source address "run @ rdomain" The user ID “rid” is obtained, the destination address is rewritten to “sun @ sdomain”, and the sender address is rewritten to “rid.kw@kwmail.ne.jp” to transfer the mail. As described above, the mail transfer server 610 rewrites the destination address from the keyword address to the real address, rewrites the real address of the transmission source to the reply format, and rewrites the destination address to the real address when receiving the reply mail having the reply address in the reply format. At the same time, by rewriting the sender address to the keyword address, disclosure of the actual address can be prevented even when the user directly replies to the keyword address mail.

  In the first and second embodiments, the mail delivery system has been described from the functional aspect. However, in practice, each device such as the mail transfer server 110 and the data management server 130 is realized by a commercially available computer. You can install programs on each of these computers. This program may be loaded not only from a secondary recording medium such as a hard disk device or a ROM but also from a recording medium such as a CD-R. For example, when loading a program from a CD-R, a mail transfer server 110 program, a data management server 130 program, etc. are stored in advance on a CD-R (may be a separate CD-R for each device). The CD-R is loaded into the CD-R reader of each device, and the program is loaded.

  In the first and second embodiments, the case of using three server devices, that is, a mail transfer server, a word registration server, and a data management server has been described. However, the present invention is not limited to this. The present invention can be similarly applied to the case where the functions provided by the registration server and the data management server are provided by one server device, or when all the functions are provided by one server device.

  In the first and second embodiments, the case where a keyword address is used as an e-mail address used for an e-mail message such as Internet mail or mobile mail has been described. However, the present invention is not limited to this. It can also be used in message addresses used for so-called instant messages, presence exchange messages, SIP messages such as IP telephone control messages. In other words, the present invention can be similarly applied not only when delivering e-mail messages between users, but also when delivering SIP messages such as instant messages, presence exchange messages, and IP phone control messages. it can.

  In the first and second embodiments, the case where the mail destination address (TO address) is replaced with the real address has been described for transfer. However, it is not essential to replace the destination address during the transfer. In the transfer protocol for transferring mail data to the mail server without replacing the destination address, the mail may be transferred by defining the real address of the mail transfer destination.

  In the first and second embodiments, the case where the mail transfer server transfers the mail to the mail server for the callee has been described. However, the present invention is not limited to this. By having the role of a mail server for recipients, mail that has a delivery judgment result is distributed to the recipient's message box (box corresponding to the recipient's real address) provided in the mail transfer server. You may make it store.

  As described above, the message delivery system, the message transfer device, the message transfer method, and the message transfer program according to the present invention are useful for message delivery that eliminates annoying messages, and in particular, a user uses a large number of mail addresses. Suitable for cases.

1 is a diagram illustrating a configuration of a mail delivery system according to a first embodiment. It is a figure which shows an example of a keyword address. It is a figure which shows an example of a real address table. It is a figure which shows an example of an effective word table. It is a figure which shows an example of an invalid word table. It is a sequence diagram which shows the process sequence of the valid word registration process by the mail delivery system which concerns on Example 1. FIG. It is a figure which shows disclosure of a keyword address. It is a sequence diagram which shows the process sequence of the mail transfer process by the mail delivery system which concerns on Example 1. FIG. It is a flowchart which shows the process sequence of the filter process by a filter process part. It is a sequence diagram which shows the process sequence of the invalid word registration process by the mail delivery system which concerns on Example 1. FIG. It is a figure which shows the structure of the mail delivery system which concerns on Example 2. FIG. It is a figure which shows an example of a disclosure word table. It is a sequence diagram which shows the process sequence of the mail transfer process by the mail delivery system which concerns on Example 2. FIG. It is a flowchart which shows the process sequence of the filter process by a filter process part. It is a sequence diagram which shows the process sequence of the effective word lock process by the mail delivery system which concerns on Example 2. FIG. It is explanatory drawing for demonstrating the mail transfer server which can prevent disclosure of a real address by the reply mail with respect to the mail of a keyword address.

Explanation of symbols

100 LAN
110, 510, 610 Mail transfer server 111 Mail communication unit 112, 512 Filter processing unit 113 Transfer processing unit 120, 520 Word registration server 121 HTTP communication unit 122 Valid word registration processing unit 123 Invalid word registration processing unit 130, 530 Data management server 131 Real address table 132 Valid word table 133 Invalid word table 210 User A mail server 220 User A terminal 230 User A
240 User A side IP network 310 User B mail server 320 User B terminal 330 User B
340 User B side IP network 400 Internet 523 Effective word lock processing unit 533 Disclosure word table

Claims (8)

A message delivery system for delivering a message addressed to a message address including a user identifier for identifying a user and a keyword,
Valid word storage means for storing a user identifier and one or more valid words in association with each other;
Of the valid words stored in the valid word storage means, each of one or more valid words corresponding to the user identifier extracted from the message address is compared with the keyword extracted from the message address. Transferability determination means for determining that a message can be transferred when any of the keywords partially matches the keyword;
A message delivery system comprising:   The transfer propriety determining means compares each of one or more valid words corresponding to the user identifier extracted from the message address with a keyword extracted from the message address, and any of the valid words is used as the keyword. The message delivery system according to claim 1, wherein the message delivery system determines that the message can be transferred when the forward match is found. An invalid word storage means for storing a user identifier and one or more invalid words in association with each other;
The transfer enable / disable determining means includes a keyword extracted from the message address for each of one or more invalid words corresponding to the user identifier extracted from the message address among the invalid words stored in the invalid word storage means. 3. The message delivery system according to claim 1, wherein a message is determined to be untransferable when any of the invalid words completely matches the keyword. A disclosure word storage means for storing a user identifier and one or more disclosure words in association with each other;
The transfer permission / inhibition judging means determines the message when any one or more valid words corresponding to the user identifier extracted from the message address partially matches the keyword extracted from the message address. When it is determined that transfer is possible and the keyword is registered in the disclosed word storage means and does not partially match any of the one or more valid words, the disclosure word stored in the disclosed word storage means One or more disclosure words corresponding to the user identifier extracted from the message address are compared with the keyword, and it is determined that the message can be transferred when any of the disclosure words completely matches the keyword. The message delivery system according to claim 1, wherein the message delivery system is a message delivery system. A transfer means for rewriting the message address to a real address and transferring a keyword extracted from the message address together with the message when it is determined by the transfer availability determination means to transfer a message to the user;
A reply means for receiving a reply message to the message forwarded by the forwarding means together with the keyword, reproducing the message address using the received keyword, and forwarding the reply message using the reproduced message address as a transmission source;
The message delivery system according to any one of claims 1 to 4, further comprising: A message transfer device for transferring a message addressed to a message address including a user identifier for identifying a user and a keyword,
One or more valid words corresponding to a user identifier extracted from the message address are acquired, and each of the acquired valid words is compared with a keyword extracted from the message address, and any of the valid words is A message transfer device comprising: transfer permission / non-permission determining means for determining that a message can be transferred when it partially matches a keyword. A message transfer method of a message transfer apparatus for transferring a message addressed to a message address including a user identifier for identifying a user and a keyword,
One or more valid words corresponding to a user identifier extracted from the message address are acquired, and each of the acquired valid words is compared with a keyword extracted from the message address, and any of the valid words is A message transfer method comprising: a transfer permission / inhibition determining step of determining that a message can be transferred when it partially matches a keyword. A message transfer program for transferring a message addressed to a message address including a user identifier for identifying a user and a keyword,
One or more valid words corresponding to a user identifier extracted from the message address are acquired, and each of the acquired valid words is compared with a keyword extracted from the message address, and any of the valid words is A message transfer program that causes a computer to execute a transfer permission / inhibition determination procedure for determining that a message can be transferred when a keyword partially matches.

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