KR20140146432A - System for encoding information by encrypting message into common conversation - Google Patents

Abstract

The present invention discloses an information encrypting system and an information encrypting method for allowing daily conversion to be made as a cryptogram. The information encrypting system according to the present invention includes an encrypting server comprising an encryption setting unit receiving a request for cryptogram setting from a user and setting a member ID, a password, and a subject of a cryptogram of a user included in the requested setting information; an encryption request receiving unit receiving a request for encryption processing and receiving original text message from the user; a cryptogram providing unit determining a cryptogram of daily conversation according to the subject set for the encryption-requested message and providing the same; a decryption request receiving unit receiving a request for decryption processing; and an original text message providing unit providing original text message previously stored through decryption processing. According to the present invention, the user may encrypt a message as a cryptogram of daily conversation, thus maintaining security of the message.

Description

[0001] The present invention relates to an information encryption system and an information encryption method for encrypting a message into a daily conversation,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an encryption technique for information, and more particularly to an information encryption system and an information encryption method for encrypting a message into a general conversation and restoring an encrypted general conversation to an original message.

Message applications (such as SMS, mail, SNS, etc.) send messages between the sender and the recipient over the network. There are various methods for security processing of messages.

Messages of various contents are stored in applications such as SNS (e.g., Twitter, Facebook, KakaoTalk) of a user terminal, SMS, mail, messenger, etc., and not only a user but also other users can view messages by operating an application . For example, if the user terminal is a computer terminal or a smart terminal, the user A's friend, friend, family, etc. can view the stored message information by operating the user terminal of the user A.

Here, the user can password-code the execution right of the application. The application displays a password input screen at the time of execution and guides the user to input the password. Then, only the user whose password has been successfully authenticated can execute the application to inquire, send and receive messages. In addition, the application may provide a message encryption service to convert the message content into an unintelligible cipher text. The originating application encrypts and transmits the message, and the receiving application receives and decrypts the encrypted message. In such a case, the malicious third party may know that the password is set to the execution right of the application when the password input screen is displayed. In addition, if the encrypted message is displayed as data that can not be understood, the malicious third party can recognize that the encrypted message is an encrypted message and attempt to decrypt it. Therefore, easily revealing what is the object to be encrypted to anyone can cause the attack attempt of the user, which weakens the security.

In addition, the message is transmitted through the server of the communication carrier and the server of the message service provider. Therefore, a message is stored in the server of the communication carrier and the server of the message service provider, and the stored message can be subject to inquiry to the carriers of the communication service and the message service as much as possible.

It is an object of the present invention to provide an information encryption system and an information encryption method which are created by the recognition of the above-described prior arts, and in which a message is encrypted by a general conversation sentence so that the message is not encrypted or not exposed.

Another object of the present invention is to enable a message service to be used as a personal encrypted information separately from an encryption function provided in a message service by a service provider.

According to another aspect of the present invention, there is provided an information encryption system for encrypting a message according to the present invention by a daily conversation, the system comprising: An encryption setting unit; An encryption request receiving unit for receiving a request for encryption processing and receiving a message text of a user; Decrypting a cipher text of a daily conversation corresponding to the subject set for the message for which encryption is requested; A decoding request receiving unit for receiving a decoding process request; And a message text providing unit for providing the original message text previously stored by the decryption processing.

In the present invention, the encryption server may further include a ciphertext management unit for storing a plurality of ciphertexts in the subject by a daily conversation between users, wherein the first ciphertext corresponds to a plurality of second ciphertexts as a next conversation, 2 cipher text is composed of the same user's conversation as the user of the first cipher text and the user's other conversation of the first cipher text.

Here, the encryption setting unit receives the number of users of the message to which the message original is allowed to be received by the decryption process, and receives the request for the encryption setting.

In addition, the message source text providing unit provides the decryption process request only once for each individual user who is permitted to receive the individual message original text.

Further, the encryption server further includes a message source deletion unit that deletes the message source text when the providing of the message source text decrypted to the user is permitted to receive the message source text.

According to an aspect of the present invention, there is provided an information processing apparatus comprising: an encryption setting request unit for transmitting a request for an encryption setting including a member ID, a password, a number of users of the subject, and a message; An encryption request unit for transmitting the message text entered in the message application to request an encryption process; A ciphertext receiving unit for receiving the ciphertext in which the requested message is encrypted; A ciphertext replacing unit for deleting the original message from the message application and replacing the original message with the ciphertext; A decoding request unit for requesting the decoding process at the request of the user; A message source receiving unit for receiving and storing the original message at the request of the decoding process; And a user terminal including a message text display unit for reading and displaying the stored message text on a screen.

Here, the encryption server adds a serial number to the message source requested to be encrypted from the user terminal and stores the serial number, receives a decryption request including the last serial number stored in the user terminal from the user terminal, Provide at least one message text with a large serial number.

When the event of the decryption request is generated, the user terminal transmits the last serial number to the encryption server to request a decryption process, and receives from the encryption server at least one message having a higher serial number than the last serial number And stores it.

Further, the encryption server provides the services of the encryption processing and the decryption processing to the user who has successfully authenticated the member ID and the password.

According to an aspect of the present invention, there is provided an information encryption method for encrypting a message according to the present invention into a daily conversation, the encryption server providing an encryption and decryption service between a message text and a cipher text of a user to a user terminal, (a) an encryption setting step of receiving a request for setting a cipher text from the user terminal, and setting a subject of a user's member ID, a password, and a cipher text included in the requested setting information; (b) receiving a request for encryption processing from the user terminal and receiving a message text of the user; (c) a ciphertext providing step of encrypting the original message text to determine a cipher text of a daily conversation that matches the set subject, and providing the cipher text to the user terminal; (d) a decryption request receiving step of receiving a decryption process from the user terminal; And (e) a step of providing the message text to the user terminal by inquiring of the message text previously stored by the decryption process.

According to an aspect of the present invention, a user can input a text message encrypted with a cipher text of a daily conversation in a message communication, thereby enhancing the security of the message.

In addition, the encryption and decryption service of the present invention is provided only to users who share a set password, and a communication service provider and a message service provider are provided only with a ciphertext message so that only the users sharing the password know whether the original message exists .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention below, And should not be construed as interpretation.
1 is a schematic block diagram of an information encryption system for encrypting a message according to an embodiment of the present invention into a daily conversation.
2 is a schematic internal structure diagram of an encryption application and an encryption server according to an embodiment of the present invention.
FIG. 3 and FIG. 4 illustrate data of an encryption server according to an embodiment of the present invention.
5 to 7 are diagrams illustrating screens of a user terminal according to an exemplary embodiment of the present invention.
8 is a schematic flow diagram of an information encryption method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

<1. System configuration>

1 is a schematic block diagram of an information encryption system 1 for encrypting a message according to an embodiment of the present invention into a daily conversation.

The information encryption system 1 according to an embodiment of the present invention includes a user terminal 2 and a cryptographic application 200 executing a cryptographic application 200 that is provided with a message encryption and decryption service, And an encryption server 3 for providing the encryption key.

The encryption and decryption service is provided only to users of the message communication knowing the password. The encryption service encrypts the original message of the user to determine a ciphertext message, and the decryption service decrypts the ciphertext message and restores the original message. By the decryption process, the user can read the restored original message.

Here, the ciphertext message is a general sentence message having a different content from the original message. Therefore, if the user who requested the encryption of the original message forgets the encryption, it can mistake the encrypted message as the original message by understanding the contents of the encrypted message as the contents of the original message. Of course, a user who can not determine whether the message is a ciphertext or a text can decipher the message after reading the restored original message after requesting the decryption process. Of course, if the user can not read the restored original message, the user can know that the message is original.

The message is a message communicated between users through a message application, and is not particularly limited. For example, a message communicated through a messaging application such as SMS, instant messenger, mail, SNS (e.g., Kakao Talk, Twitter, Facebook, etc.) is subject to encryption and decryption.

The user terminal 2 includes a computer terminal (e.g., a PC, a notebook computer, etc.) and a smart terminal (e.g., a smart phone, a smart pad, etc.). Is included in the user terminal 2 of the present invention as long as the cryptographic application 200 can be installed and executed. The user terminal 2 executes a message application and a cryptographic application 200. The message application receives the original message of the user in the input window and transmits the message inputted by the user's command.

Here, when an event of an encryption request is generated between input and transmission of a message, the message text of the input window of the message application is replaced with a cipher text by the encryption processing of the encryption application 200. [ The message application then sends a cipher text message according to the user's command, stores the transmitted message in the local store, and displays it in the message window of the message application. Then, the encryption application 200 intercepts the original message from the message application and requests encryption, and replaces the original message with the encrypted message that is responded to by the encryption request. The user who sent the message and the user who received the message inquire the message of the cipher text through the message application.

The user must request decryption through the encryption application 200 to the encryption server 3 in order to view the original message. Then, the encryption application 200 displays, in the message window of the encryption application 200, the original text message received from the encryption server 3 in response to the decryption request.

The encryption server 3 receives a membership request from a user who subscribes for a service through a home page, and issues a member ID to the user. The encryption server 3 can provide the encryption and decryption service to the user's encryption application 200 when the encryption server 3 receives the password from the registered member user. The encryption server 3 receives the request for encrypting the original text message from the encryption application 200, performs encryption processing, and generates a general sentence ciphertext message having a different contents to respond to the encryption application 200. Then, the encryption server 3 receives a decryption request from the encryption application 200, performs decryption processing, and provides the original text message corresponding to the encrypted text message to the encryption application 200.

The message server 300 is a server for providing a message communication service to a message application installed in the user terminal 2. [ The SMS server, the messenger server, the mail server, and the SNS server may correspond to the message server 300.

For example, assume that an SMS message is transmitted between caller A and recipient B. The caller A sets the encryption information required for encryption and decryption in the encryption server 3 by using the encryption application 200 to perform message communication with the recipient B and the cipher text. Caller A contacts recipient B and informs the set password information. The caller A who has completed the password setting executes the SMS application of the user terminal 2 and inputs the original message to be transmitted.

The caller A who has completed the input of the original message sends an encryption request to the encryption server 3 using the encryption application 200. By the encryption request, the encryption application 200 inquires the original message from the input window of the SMS application, and transmits the encryption request information including the original message to the encryption server 3. The encryption server 3 stores the original text message received by the encryption application 200 in response to the encryption request, determines the corresponding ciphertext message and replies to the encryption application 200. The sender A's cryptographic application 200 then receives the ciphertext message and replaces the original message entered in the SMS application with the received ciphertext message. When sender A issues an origination command using the SMS application, the substituted ciphertext message is sent to recipient B's SMS application.

The SMS application of sender A and sender B stores a ciphertext message. After originator A or sender B seeks password authentication using password application 200 to see the original message, it must make a decryption request to encryption server 3. When the encryption server 3 receives the decryption request, the encryption server 3 inquires the original message stored against the sender A or the recipient B who has succeeded in the password authentication and provides the original message to the encryption application 200. Then, the encryption application 200 of the user terminal 2 can display the original message.

2 is a schematic internal structure diagram of an encryption application 200 and an encryption server 3 according to an embodiment of the present invention. 3 and 4 are exemplary data of an encryption server according to an embodiment of the present invention. Hereinafter, description will be made with reference to Figs. 2 to 4. Fig.

The encryption application 200 according to an embodiment of the present invention includes an encryption setting request unit 21 for requesting a user to set a password, an encryption request unit 22 for requesting encryption processing by transmitting a user's input message, A ciphertext replacing unit 24 for substituting the received ciphertext with the received ciphertext instead of the original text message input by the message application, a decryption request unit 25 for receiving the decryption request of the user A message text receiving unit 26 for receiving a text message in response to the decryption request, and a message text display unit 27 for displaying the received text message on the screen of the encryption application 200.

The encryption server 3 according to the embodiment of the present invention includes an encryption setting unit 31 for receiving and registering password setting information of a user, an encryption request receiving unit 32 for receiving a user's encryption request, A decryption request receiving unit 35 for receiving a decryption request of the user, and a message text providing unit 36 for responding to a text message stored in response to the decryption request . The encryption server 3 further comprises a message text deletion unit 37 for deleting the original text message when the reception of the original text message of the entire user is completed.

The encryption setting unit 31 receives the encryption setting information from the encryption setting request unit 21 and stores it. Referring to FIG. 3, the encryption setting request unit 21 transmits password setting information including a member ID / password of a user who sets a password, a conversation topic, and the number of users to the encryption server 3, do.

Here, the member ID is information for identifying a user requesting a service, and the password is a password different from a login password of a member user and is a service ID for identifying an individual service. The member ID / password is used as an identification key to identify the conversation subject, the number of users, the original message, and the like. A user can set a plurality of ciphers and maintain the security of the message by making different users of the messages for each ciphertext. For example, user A may set different passwords when communicating messages with friend B and with family C when communicating messages. The user is requested to input a member ID and a password as service authentication information in order to request a service of encryption and decryption.

The conversation topic identifies the content category of the cipher text composed of the daily conversation, and there is no particular limitation. For example, conversation topics can be classified as "friends", "business meetings", "travel", "weather", and the like. The encryption server 3 stores ciphertexts in the ciphertext DB so that the contents of a plurality of ciphertexts are maintained in association with each other according to each conversation topic. Thus, just as the contents of the original messages between users are semantically linked in time order, the contents of the translated ciphertext messages are also semantically linked to the content of the conversation subject.

The number of users is the number of users who are allowed to receive a decrypted original message in which a password is shared. For example, if caller A sets a password and communicates with two recipients in a ciphertext message, sender A sets the number of users to three, which is the total number of participants. On the other hand, the password setting information may further include identification information (e.g., a device ID) of the user terminal 2 as information for identifying a user who requests a service of password setting.

Further, after the password setting is completed, the user who sets the password shares the password by informing the other party of the message of the password. After all users sharing the password execute the encryption application 200, they can request the encryption server 3 to perform the encryption processing, and can communicate with the other party through the cipher text, and can request the decryption processing to receive the original message. Here, the user requesting the service of the encryption processing or decryption processing receives the service on the premise that the password authentication is successful by inputting the member ID and password of the user who sets the password. The encryption server 3 judges that the password authentication is successful when the member ID and password input by the user match the member ID and password stored in the DB.

The encryption request receiving unit 32 receives the encryption request information from the encryption request unit 22. [ Referring to FIG. 3, the encryption request information includes a member ID / password and a text message. Of course, the member ID / password is information of the user who sets the password, and the encryption requester must input the member ID / password of the password setter. Anyone who shares the password can input the ID / password of the shared password setter into the password application 200 to request the encryption of the original message after the password authentication is successful.

Here, the encryption request information may further include identification information of a message application. If it is assumed that the identification information is included, the encryption request unit 22 may obtain the identification information of the message application in which the encryption-requested message is input, and then add the identification information to the encryption request information. The identification information enables identification of a message application message. Of course, the identification information may be omitted according to the service policy.

The encryption request information may further include user identification information for identifying a user requesting the encryption service. The user identification information may be a member ID in the case of a member user, or the identification information of the user terminal 2 in the case of a non-member.

The decryption unit 33 assigns a serial number to the encrypted original message and stores the original message in association with the serial number and the user identification information. Then, the decipherment unit 33 inquires the cipher text from the DB to determine a cipher text that matches the set conversation subject, and responds the cipher text to the cipher application 200. Referring to FIG. 3, the decryption unit 33 responds with ciphertext information including a cipher text.

Here, the serial number is a unique identification number of a text message that sequentially increases according to a temporal sequence of the individual messages. Therefore, the latest text message stored last by the decipherment unit 33 has the largest serial number. Using the serial number of the original message and the user identification information, the encryption application 200 can identify each user who created the message and display it on the screen according to the generation time sequence of the message.

Referring to FIG. 4, the encryption server 3 stores ciphertexts using a tree structure so that contents of messages can be semantically linked according to the generation order of messages according to conversation subjects.

The level number corresponds to the time sequence information of the message corresponding to the serial number. The tree structure has a root note corresponding to level 0 for each conversation topic. Each node corresponding to the lower level of the root node is assigned a cipher text of a general conversation sentence that is dependent on the conversation topic. The parent node of the upper level is connected to a plurality of child nodes to which the content of the conversation is connected semantically according to the conversation topic.

For example, if the user 1 first requests encryption after the password is set by the user 1, the decryption unit 33 inquires the ciphertext assigned to an arbitrary node among the nodes of the level 1, (200). At this time, the node of the encrypted ciphertext is the parent node. The user 1 transmits a send message (SM) to the user 2 with the received level 1 ciphertext.

At this time, the next message becomes level 2, and the user 1 can transmit the origination message again or the user 2 corresponding to the other party can transmit the response message (RM). Assuming that the user 1 transmits a message at level 2, the node is randomly selected among the outgoing messages classified as the conversation of user 1 of level 1 among the corresponding child nodes of level 2, and the corresponding ciphertext is determined. Assuming that the user 2 transmits a message at level 2, the cipher text of the randomly selected node among the response messages classified as the conversation of the other party among the level 2 child nodes is determined.

Therefore, when a message is communicated with the ciphertext of the tree structure, the ciphertext conversation of the user can be semantically connected to each speaker. Of course, when the ciphertext message is managed using the tree structure shown in Fig. 4, the encryption server 3 can convert and provide a ciphertext, which is semantically connected to each speaker even among a plurality of users with two or more users . When the encryption server 3 stores ciphertexts in a tree structure for each language, it is possible to provide a multilingual encryption service.

When the ciphertext receiving unit 23 receives the ciphertext as a response to the encryption request from the ciphertext providing unit 33, the ciphertext replacing unit 24 generates a deletion event of the original message in the input window of the message application, And generates an event. Then, in the input window of the message application, an alternative inputted cipher text is displayed instead of the original text message input by the user. Thereafter, the user can select a transmission command in the message application and send the substituted ciphertext to the other party.

The decryption request receiver 35 receives a decryption request from the decryption request unit 25 when a decryption request event occurs by the user in the encryption application 200. [ Referring to FIG. 3, the decryption request receiver 35 receives decryption request information including a member ID / password, message application information, and last serial number. Here, the decryption request information may further include the user identification information to identify a user requesting the decryption service. The user identification information has already been described above.

The last serial number corresponds to the serial number of the original message received last by the encryption application 200. Also, the last serial number is the largest serial number among the serial numbers of the original messages stored in the local storage of the encryption application 200, and is also the serial number of the most recently received original message. Of course, when the decryption request receiving unit 35 first receives a decryption request for the ID / password of the cipher provided from the decryption request unit 25, the last serial number is the smallest initial value.

In addition, the decryption request information may further include identification information of a message application according to a service policy. Preferably, when the encryption request information includes the identification information of the message application, the identification information is included in the decryption request information. If the identification information of the message application is not included in the encryption request information, the identification information is not included in the decryption request information. The decryption request unit 25 may obtain identification information of a running message application and add the identification information to the decryption request information.

The message original text providing unit 36 transmits the original text message and the corresponding serial number as a response to the decryption request to the encryption application 200 by a decryption process.

Here, the message original text providing unit 36 inquires at least one original text message having a serial number greater than the last serial number from the DB, and transmits the inquired original text message when the inquiry is successful. By comparing the serial numbers, the message original text providing unit 36 provides the stored original text message to the encryption application 26 only once at the beginning.

Therefore, when the original message text providing unit 36 fails to inquire a text message from the DB, it means that there is no new ciphertext message generated since the encryption application 200 has previously received the original text message . For example, there is no original message stored in the encryption server 3, or there is no original message of a serial number larger than the serial number received from the encryption application 200. [

In addition, the message application information of the decryption request information is information that can be selectively omitted according to a service policy. When the message application identification information is included, the decryption request unit 25 of the encryption application 200 transmits a decryption request using the identification information of the currently executing message application. Then, the encryption application 200 can receive the original message of the serial number greater than the last serial number, corresponding to the identification information of the member ID / password and the message application from the original message provision unit 36. [

For example, when a decryption request is generated in a state where the A-message program is executed in the user terminal 2, it is possible to receive the original message input through the A-message program. If the message application identification information is not included, the encryption application 200 can receive the entire original message corresponding to the member ID / password from the encryption server 3. [ For example, when a decryption request is generated in the user terminal 2, it is possible to receive the original message input through the entire message program of the user terminal 2. [

Then, the message original text receiving unit 26 of the encryption program 200 completes the process of receiving the original text message against the original text providing unit 36. [ In the receiving process, reception of the original text message may or may not occur depending on whether or not the retrieval of the original text data providing unit 36 is successful. If the original message receiving unit 26 receives at least one original message having a serial number, it stores the received original message in the message store of the encryption application 200. Here, the latest original message stored by the original message receiving unit 26 is not only the largest serial number among the serial numbers of the messages stored in the encryption application 200, but also the last serial number.

Thereafter, the original message display unit 27 reads all the original text messages stored in the message store, classifies the original messages according to the serial number of the original text message and the user identification information of the user who created the message, And displays the original message on the message window of the screen.

Meanwhile, the encryption service of the present invention enables the original message to be viewed only among the users sharing the password. The original message deletion unit 37 judges that the transmission of the original message has been completed when the number of times of providing the original message reaches the number of users, Delete the message. That is, the encryption server 3 stores the original message only until the number of times of providing the original message reaches the number of users.

The original message received by the encryption application 200 from the encryption server 3 is stored in the message storage. When the decryption request event occurs, the encryption application 200 refers to the message store and transmits the final serial number to the encryption server 3 to request decryption.

In the above, since the message application processes the message communication with the cipher text message, the communication service provider and the message service provider can not know the existence of the original message and can not confirm it.

5 to 7 are exemplary screen views of a user terminal 2 according to an embodiment of the present invention. The illustrated screens of FIGS. 5 through 7 do not limit the technology of the present invention, and various modifications may be made according to need.

The user terminal 2 executes the encryption application 200. [ Here, the encryption application 200 can be produced as a dedicated application or an application application in which the functions of the encryption application 200 are integrated. Examples of the application include a keyboard application or a message application in which functions of the encryption application 200 are integrated, and there is no particular limitation.

After the password application 200 is executed, the member user inputs an ID and a password for login and logs in the encryption server 3. [ Then, the logged-in member user receives the password authentication by inputting the ID and password of the password setter to use the service. Of course, the non-member user omits the login process and is accompanied by a password authentication process.

5, an execution screen of the encryption application 200 is shown in the user terminal 2. For convenience of explanation, it is assumed that the user terminal 2 is a smart terminal and a computer terminal. It is also assumed that the function of the encryption application 200 is incorporated in the keyboard application, and that the execution screen of the encryption application 200 is an execution screen of the keyboard application. Of course, the keyboard application may be an application embedded in an operating system (OS) or an independent application provided by a third party.

When the user terminal 2 is a smart phone, a keyboard application in which functions of the encryption application 200 are integrated can be executed. The keyboard application may be provided with a key button such as "plain text password" Alternatively, the function of the encryption application 200 may be added to the menu of the keyboard application so that the function of the encryption application 200 can be selected by the user.

When the user terminal 2 is a computer terminal, since the computer terminal includes the keyboard device, the input screen of the keyboard application is not displayed separately as in the smart terminal. When a key is selected in the input area of the application, characters of the key selected by the input processing of the keyboard application are input to the input area. If the keyboard application at the computer terminal is displayed as an input method editor (IME) icon in the task bar, the function of the cryptographic application 200 may be displayed in the icon menu. Here, the function of the encryption application 200 may be defined as a separate key button (e.g., a combination key in which two keys are simultaneously pressed) so that the function can be selected by the user.

Referring to FIG. 6, it is assumed that a user executes an SMS application to display a keyboard application in which the encryption application 200 is integrated. It is assumed that the user has selected the password setting in the keyboard application and set the conversation topic as "business meeting ". Then, the user assumes that the SMS application has entered the original message "New product D day is tomorrow ".

Here, after the user inputs the member ID / password of the user who sets the password, the user can request the encryption if the password authentication is successful. By the encryption request, the keyboard application sends the original message to the encryption server 3 and receives the cipher text "I have a development conference today ". Then, the keyboard application replaces the ciphertext message in place of the original text message entered in the SMS application on the screen. The SMS application screen then displays the cipher text "I have a development meeting today" instead of the original text message. Thereafter, when the user presses the transmission button, a ciphertext message is transmitted to the other party via the communication company server, the SMS server, and the like. Therefore, the sender and receiver SMS applications always display the ciphertext in the message window of the SMS.

If the sender and the recipient want to look up a cipher text displayed in the message window of the SMS application as a text message, they must request the decryption using the keyboard application through password authentication. The sender or recipient may mistake the cipher text displayed in the SMS message window as the actual message in some cases. When decryption is requested, the keyboard application queries the local repository to inquire the last serial number of the original message, sends the last serial number to the encryption server 3 to request the original message, Download the original message "New D Day is tomorrow" of the larger serial number and store it in local storage.

Then, the keyboard application reads the entire original message stored in the local storage using the member ID / password and SMS application information as the inquiry key, displays the original message in a separate message window by separating the user and the serial number. Then, a cipher text message "I have a development meeting today" is displayed in a message window of the SMS application, and a text message "new product D day is tomorrow" Here, if there is no message application information in the inquiry key, the entire original message inquired with the member ID / password is displayed and displayed on the screen without distinguishing the message application.

Referring to FIG. 7, after a user performs a plurality of message communications, a ciphertext message of the SMS application and a text message of the keyboard application are shown in FIG. The user can inquire each ciphertext and text message while switching the screen of the SMS application and the screen of the keyboard application.

The keyboard application stores the original message received in the decryption request in the local storage. The keyboard application receives the latest text message that has not been downloaded from the encryption server 3 to the local repository every time the decryption request is made. The encryption server 3 deletes the original message when the number of times of providing the original message increases and becomes equal to the set number of users. Therefore, only the keyboard application of the users sharing the member ID and password set in the ciphertext message receives the original message and stores it in the local storage, thereby enhancing the message security of the user. Preferably, the encryption application request and the decryption request of the keyboard application can be processed only when the user's password authentication is successful.

<2. Method composition>

The information encryption method for encrypting the message according to the embodiment of the present invention into the daily conversation can be preferably realized through the construction of the information encryption system 1 described above.

8 is a schematic flow diagram of an information encryption method according to an embodiment of the present invention.

The user terminal 2 downloads the encryption application 200 and installs it. The cryptographic application 200 may be installed as a dedicated application, or may be installed with other application applications (e.g., a keyboard application, a message application, etc.) in which functions of encryption and decryption processing are integrated.

When the user sets the password after the password application 200 is executed, the encryption server 3 registers the password setting information from the password application 200 and sets the password with the received information (S31).

Here, the password setting information includes a user's member ID / password, a subject, and the number of users. A user who is a member of the home page of the encryption server 3 can receive the member ID and set a password. The cipher can be provided with the service of encrypting and decrypting the message only by the users whose password authentication is successful as the information required in the request for encryption and decryption. The subject is the subject of everyday conversation in which the content of ciphertext is categorized. The user who sets the password notifies the user of the other party to communicate the message with the member ID / password, and the users participating in the message communication share the ID / password. The number of users refers to the total number of users sharing the password. When the number of deliveries reaches the number of users for each original message, the encryption server 3 deletes the corresponding original message.

After the password setting is completed, in order for the user to request the encryption or decryption of the message, the user must input the set member ID and password to perform the password authentication. After executing the password application 200, the member user can input the login ID and the login password into the login window. The non-member user may skip the login process.

Thereafter, the member or non-member user enters the password set in the member ID and message that set the password. At this time, the input password is independent of the login password. The encryption server 3 receives the member ID / password from the encryption application 200, processes the password authentication of the user, and provides a service for encrypting and decrypting the message to the user who succeeded in the password authentication. When the password authentication is successful in the instance that requests the service for the first time every time the password application 200 is executed, password authentication may be omitted from the next instance.

When an event of the encryption request is generated in the user terminal 2, the encryption server 3 receives the encryption request including the original message from the encryption application 200 (S32).

Here, if the user who has succeeded in the password authentication requests encryption through the encryption application 200 in a state where the original text message is inputted into the input window of a message application (e.g. SMS, SNS, mail, chat, etc.) An event is generated. Upon receiving the encryption request, the encryption server 3 attaches a serial number to the original message so as to correspond to the ID / password and stores the same.

When the original message is stored, the encryption server 3 inquires the cipher text corresponding to the original text message received in the set subject and responds to the encryption application 200 (S33).

Here, the encryption server 3 identifies the speaker participating in the message communication and inquires the ciphertext following the conversation flow. For example, when three users A, B, and C communicate with each other, the encryption server 3 identifies each user among ciphertexts of the set subject, and decides a ciphertext in which three conversation contents are semantically related. Assume that user A requests encryption and a cipher text is provided. Here, if A again requests encryption, the message of A is inquired at the child level of the ciphertext provided to A at the previous level through the tree structure of FIG. If B or C, but not A, has requested encryption, the response message of the opposite party B or C is selected and provided at the child level.

After the cipher text is provided to the cryptographic application 200 in accordance with the cryptographic request, the cryptographic server 3 can provide the original text message to the cryptographic application 200 upon receiving the decryption request from the cryptographic application 200. [

When an event of a decryption request is generated in the user terminal 2, the encryption server 3 receives a decryption request containing the largest serial number among the original messages in the local storage of the encryption application 200 from the encryption application 200 (S35).

After the step S31, the user who has succeeded in the password authentication requests the decryption through the encryption application 200 while executing the message application. Then, the event of the decryption request is generated.

When the decryption request is received, the encryption server 3 inquires the entire original text message having the serial number larger than the received serial number and provides it to the encryption application 200 (S36).

If the encryption server 3 fails to inquire the original message, the encryption application 200 has already downloaded the entire original message and there is no new ciphertext message generated since the last download. When the fact that the original message is downloaded is inquired with the identification information of the user requesting the original message as a key, the encryption server 3 does not provide the original message. Herein, it has been described above that when using the identification information of the currently executing message program, only the original message inputted through the message program can be provided.

If the number of times the individual original message is provided matches the number of users set in the step S31, the encryption server 3 deletes the original message (S37).

Here, if the original text message is provided to the encryption application 200, the encryption server 3 identifies the user who received the original text message, and increases the number of times of providing the original text message by one. When all users of a message sharing a password are provided with individual original message, the number of times the individual original message is provided is equal to the number of users. At this time, the password application 200 of each user has already stored the original message in the local repository. Therefore, the encryption server 3 can delete the original message and maintain security from a third party.

Thereafter, when the encryption application 200 receives at least one original message from the encryption server 3, it stores the received original message in the local storage. Of course, when the encryption application 200 has already stored the latest original message, it may not receive the original message from the encryption server 3. [

Then, the encryption application 200 reads the entire original message corresponding to the information of the currently running message application from the local repository, identifies the creator (speaker) and the serial number (conversation order) of the original message, ) Displays a text message in accordance with the speaker and conversation order. Here, the conversation list of the ciphertext is displayed on the screen of the message application, and the conversation list of the original text is displayed on the screen of the cryptographic application 200. The user can switch between the screen of the application and the screen of the encryption application 200 to enable the message inquiry of the ciphertext and the original text.

In the above-described embodiment, the term "part" is not used as a term meaning a hardware division of the information encryption system 1. Accordingly, a plurality of constituent parts may be integrated into one constituent part, and one constituent part may be divided into a plurality of constituent parts. Also, the constituent unit may mean a hardware constituent unit, but may mean a constituent unit of software. Therefore, it should be understood that the present invention is not particularly limited by the term "part ".

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It goes without saying that various modifications and variations are possible within the scope of equivalence of the scope.

1: information encryption system 2: user terminal
200: encryption application 3: encryption server
4: Message Server

Claims (18)

An encryption setting unit for requesting a user to set a cipher text and setting a subject of a user's member ID, a password, and a cipher text included in the requested setting information;
An encryption request receiving unit for receiving a request for encryption processing and receiving a message text of a user;
Decrypting a cipher text of a daily conversation corresponding to the subject set for the message for which encryption is requested;
A decoding request receiving unit for receiving a decoding process request; And
A message text providing unit for providing the original message text previously stored by the decrypting process;
And an encryption server including the encryption server. The method according to claim 1,
The encryption server includes:
The first ciphertext corresponds to a plurality of second ciphertexts as a next conversation, and the second ciphertext corresponds to a second ciphertext corresponding to a user of the first ciphertext A user's conversation and a user's conversation with the first cipher text. The method according to claim 1,
The encryption /
Wherein the decryption processing further receives the number of users of the message to which the message original is allowed to be received, and receives the request for encryption setting. The method of claim 3,
Wherein the message-
Wherein the decryption processing unit provides the decryption processing request only once for each individual user who is allowed to receive the individual message original text. The method according to claim 1,
The encryption server includes:
Further comprising a message original deletion unit deleting the original message when the providing of the message original decrypted to the user is permitted to receive the message original. The method according to claim 1,
An encryption setting request unit for transmitting a request for an encryption setting including a member ID, the password, the subject, and the number of users of the message;
An encryption request unit for transmitting the message text entered in the message application to request an encryption process;
A ciphertext receiving unit for receiving the ciphertext in which the requested message is encrypted;
A ciphertext replacing unit for deleting the original message from the message application and replacing the original message with the ciphertext;
A decoding request unit for requesting the decoding process at the request of the user;
A message source receiving unit for receiving and storing the original message at the request of the decoding process; And
Further comprising a user terminal including a message text display unit for reading the stored message original text and displaying it on the screen. 7. The method according to claim 1 or 6,
The encryption server includes:
Receiving a decryption request including a last serial number stored in a user terminal from a user terminal, receiving at least one serial number having a serial number greater than the last serial number from the user terminal, Wherein the information processing apparatus provides the original message text. 8. The method of claim 7,
The user terminal comprises:
When an event of a decryption request is generated, transmits the last serial number to the encryption server to request decryption processing, and receives at least one message text having a serial number greater than the last serial number from the encryption server, . 7. The method according to claim 1 or 6,
The encryption server includes:
And provides the services of the encryption processing and the decryption processing to the user who has successfully authenticated the member ID and the password. An information encryption method in which an encryption server provides an encryption and decryption service between a message text and a cipher text of a user to a user terminal,
(a) an encryption setting step of receiving a request for setting a cipher text from the user terminal, and setting a subject of a user's member ID, a password, and a cipher text included in the requested setting information;
(b) receiving a request for encryption processing from the user terminal and receiving a message text of the user;
(c) a ciphertext providing step of encrypting the original message text to determine a cipher text of a daily conversation that matches the set subject, and providing the cipher text to the user terminal;
(d) a decryption request receiving step of receiving a decryption process from the user terminal; And
(e) a step of providing a message text to be provided to the user terminal by inquiring the original message text stored in advance by the decryption process,
And encrypting the information. 11. The method of claim 10,
Prior to step (a)
Wherein the encryption server further includes a ciphertext management step of storing a plurality of ciphertexts as the daily conversation between users,
Wherein the first ciphertext is associated with a plurality of second ciphertexts as a next conversation and the second ciphertext is comprised of a conversation of the same user as the first ciphertext and a second conversation of the user of the first ciphertext, . 11. The method of claim 10,
The step (a)
Wherein the encryption server further receives the number of users of a message to which the message original is allowed to be received by the decryption processing and receives an encryption setting request. 11. The method of claim 10,
The step (e)
Wherein the encryption server provides the decryption processing request only once for each individual user who is allowed to receive the individual message text for the decryption processing request. 11. The method of claim 10,
After the step (e)
Further comprising the step of deleting the original message from the encryption server when the number of times of providing the original message of the step (e) matches the number of users of the established message. 11. The method of claim 10,
An encryption setting request step of transmitting a request for an encryption setting including the number of users of the member ID, the password, the subject, and the message in step (a);
An encryption request step of requesting an encryption process by transmitting the message text entered in the message application in step (b);
A ciphertext receiving step of receiving the ciphertext in the step (c);
Replacing the original message text in the message application with the cipher text in step (c);
A decoding request step of requesting the decoding processing at the request of the user in step (d);
Receiving a message text by receiving the message text at the request of the decryption process in the step (e); And
And a message text display step of reading the original message text stored after step (e) and displaying the read original text message on the screen. 16. The method according to claim 10 or 15,
The encryption server includes:
Adding a serial number to a message source for which encryption is requested in the step (b) and storing the serial number;
Receiving a decryption request including a last serial number stored in the user terminal in step (d); And
And providing at least one message text having a serial number greater than the last serial number in the step (e). 17. The method of claim 16,
The user terminal comprises:
When the event of the decryption request is generated in the step (d), transmitting the final serial number to the encryption server and requesting decryption processing; And
Wherein the step (e) comprises the step of receiving and storing at least one message text having a serial number greater than the last serial number from the encryption server. 16. The method according to claim 10 or 15,
The encryption server includes:
(B) and the decryption processing of the step (d) for a user who has successfully authenticated the member ID and the password.

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