KR101760376B1 - Terminal and method for providing secure messenger service - Google Patents

Terminal and method for providing secure messenger service Download PDF

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Publication number
KR101760376B1
KR101760376B1 KR1020150166351A KR20150166351A KR101760376B1 KR 101760376 B1 KR101760376 B1 KR 101760376B1 KR 1020150166351 A KR1020150166351 A KR 1020150166351A KR 20150166351 A KR20150166351 A KR 20150166351A KR 101760376 B1 KR101760376 B1 KR 101760376B1
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Prior art keywords
key
terminal
server
master
encrypted
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KR1020150166351A
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Korean (ko)
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KR20170061759A (en
Inventor
김연태
이동훈
조효진
김효승
박승환
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고려대학교 산학협력단
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/30—Transportation; Communications
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/60—Protecting data
    • G06F21/62—Protecting access to data via a platform, e.g. using keys or access control rules
    • G06F21/6209—Protecting access to data via a platform, e.g. using keys or access control rules to a single file or object, e.g. in a secure envelope, encrypted and accessed using a key, or with access control rules appended to the object itself
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/30—Arrangements for executing machine instructions, e.g. instruction decode
    • G06F9/30145—Instruction analysis, e.g. decoding, instruction word fields

Abstract

A terminal providing a messenger service is disclosed. The terminal includes a key generation unit for generating a private key using a counter value and a generated master key synchronized with the first server, a key exchange unit for exchanging a session key with the second terminal through a predetermined key exchange scheme, And an encryption / decryption unit for transmitting an encrypted message using the session key to the first server, wherein the key generation unit distributes the master key to each of the plurality of second servers using a secret sharing scheme .

Description

TECHNICAL FIELD [0001] The present invention relates to a terminal and a method for providing a secure messenger service,

An embodiment according to the concept of the present invention relates to a terminal and a method for providing a messenger service, and more particularly, to a messenger service capable of receiving a messenger service from a plurality of terminals and protecting conversation contents in a state where the device is lost To a terminal and a method thereof.

Recently, IM applications can be used simultaneously in electronic devices such as smart phones and PCs. As a result, users are using messenger applications in many areas of their daily lives. However, security risks of messenger applications are causing the problem of exposing users' personal privacy. Accordingly, in recent years, the messenger application service provider has proposed various solutions for protecting user's personal information in order to solve the above-mentioned problems. However, since the approach to the security problem and the characteristic of the service to be provided are different for each application, Is confusing which application is a more secure application. In particular, the end-to-end encryption of messenger applications, which have been a major issue in the world, including the domestic market, is not available for all devices that are available for messenger applications, making it unsafe for using messenger applications. Therefore, studies on safe messenger system architecture and user privacy protection are in progress in academia and industry.

Korean Patent Publication No. 10-2003-0047148 (2013.06.18) Korean Patent Publication No. 10-2001-0035078 (May 05, 2001)

Boneh, D., Boyen, X., Efficient Selective-ID Secure Identity Based Encryption Without Random Oracles, EUROCRYPT 2004. LNCS, vol.3027, pp.223-238. Kwangsu Lee et al., Self-Updatable Encryption: Time Constrained Access Control with Hidden Attributes and Better Efficiency, ASIACRYPT 2013 Part I, LNCS 8269, pp. 235-254.

A technical object of the present invention is to provide a messenger service providing terminal and method capable of secure encrypted communication in a plurality of terminals and protecting conversation contents in a situation in which it is necessary to protect personal information such as loss of a device will be.

A messenger service providing terminal according to an embodiment of the present invention includes a key generating unit for generating a private key using a counter value synchronized with a first server and a generated master key, And an encryption / decryption unit for transmitting a message encrypted using the session key to the first server, wherein the key generation unit generates the secret key using the secret sharing scheme, Is distributed to each of the plurality of second servers and transmitted.

The messenger service providing terminal according to another embodiment of the present invention generates a master key from the shared values received from each of the plurality of second servers using the secret distribution method, A key generation unit for generating a private key and a public key by using the incremented count value and the master key, and an update request message for requesting update of the cipher text stored in the first server to the first server Wherein the encryption / decryption unit decrypts the encrypted session key received from the first server using the private key, decrypts the encrypted message received from the first server using the decrypted session key, .

A method of providing a messenger service according to an embodiment of the present invention includes generating a private key using a counter value and a generated master key synchronized with a first server, Distributing the master key to each of a plurality of second servers, exchanging a session key with a second terminal through a predetermined key exchange scheme, 1 < / RTI > server.

According to the instant messenger service providing terminal and method according to the embodiment of the present invention, a user can synchronize a message in each device by applying an end-to-end encryption technique to all devices using an instant messenger application .

In addition, according to the present invention, it is possible to provide a secure messenger service by protecting existing messages in a situation where personal information needs to be protected, such as device loss.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to more fully understand the drawings recited in the detailed description of the present invention, a detailed description of each drawing is provided.
1 shows a messenger service system according to an embodiment of the present invention.
2 is a functional block diagram of the first terminal 100 shown in FIG.

It is to be understood that the specific structural or functional description of embodiments of the present invention disclosed herein is for illustrative purposes only and is not intended to limit the scope of the inventive concept But may be embodied in many different forms and is not limited to the embodiments set forth herein.

The embodiments according to the concept of the present invention can make various changes and can take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. It should be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms disclosed, but includes all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms may be named for the purpose of distinguishing one element from another, for example, without departing from the scope of the right according to the concept of the present invention, the first element may be referred to as a second element, The component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like are used to specify that there are features, numbers, steps, operations, elements, parts or combinations thereof described herein, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings attached hereto.

1 shows a messenger service system according to an embodiment of the present invention.

Referring to FIG. 1, a messenger service system 10 includes a first terminal 100, a second terminal 300, a first server 500, and second servers 700.

The first server 500 is a server that can provide a social network service (SNS) service or a messenger service, and may be implemented as an SNS server. A user of the first terminal 100 and a user of the second terminal 300 can be provided with an SNS service or a messenger service provided by the first server 500. In the present invention, the first terminal 100 and the second terminal 300 may be a communication partner of a messenger service.

The second servers 700 may distribute and store a portion (or pieces) of the master keys of the first terminal 100 and / or the second terminal 300. [ Each of the second servers 700 may refer to a trusted key storage organization. Accordingly, the first terminal 100 and / or the second terminal 300, in which a part of the master key is distributed and stored in each of the second servers 700, receives the distributed stored values from the second servers 700 Its own master key can be regenerated. A secret sharing scheme may be used to distribute and share the master key to the second servers 700. [

The first terminal 100 and / or the second terminal 300 may be a personal computer, a tablet PC, a notebook, a net-book, an e-reader, a PDA a personal digital assistant (PMP), a portable multimedia player (PMP), an MP3 player, a MP4 player, or a handheld device such as a mobile phone, a smart phone, And may be implemented as a handheld device.

2 is a functional block diagram of the first terminal 100 shown in FIG.

1 and 2, the first terminal 100 includes at least one of a key generating unit 110, a key exchanging unit 130, an encryption / decryption unit 150, and a setting unit 170 .

The setting unit 170 may receive an installation file for receiving a messenger service from a predetermined server, which may be the first server 500, and install the installation file in the first terminal 100. In addition, the setting unit 170 may set basic parameters of a predetermined encryption technique used by the present invention, for example, a CDE (Ciphertext-Delegatable Encryption) technique. The excerpts of the exemplary encryption schemes that can be named as the CDE technique are described in Kwangsu Lee et al., "Self-Updatable Encryption: Time Constrained Access Control with Hidden Attributes and Better Efficiency, ASIACRYPT 2013 Part I, LNCS 8269 , pp. 235-254) can be referred to, so that a detailed description thereof will be omitted.

The key generation unit 110 generates a master key (hereinafter, referred to as " master key ") used in a predetermined encryption technique

Figure 112015115593981-pat00001
Can be generated. The master key (
Figure 112015115593981-pat00002
) Is the user's private key (
Figure 112015115593981-pat00003
). ≪ / RTI >

The key generation unit 110 generates the generated master key (

Figure 112015115593981-pat00004
) And the current counter value (
Figure 112015115593981-pat00005
) Using the private key
Figure 112015115593981-pat00006
) And the public key
Figure 112015115593981-pat00007
), And the generated public key (
Figure 112015115593981-pat00008
). Also, the counter value (
Figure 112015115593981-pat00009
May have the same value as the synchronized value of the first terminal 100 and the first server 500, respectively.

The key generation unit 110 generates the generated private key

Figure 112015115593981-pat00010
) Is stored in the first terminal (100), and the master key
Figure 112015115593981-pat00011
Can be divided and shared by each of the second servers 700. [ That is, the key generation unit 110 generates a master key
Figure 112015115593981-pat00012
), And may store each of the divided pieces in each of the second servers 700. [ The master key (
Figure 112015115593981-pat00013
The key generation unit 110 generates a master key stored in the first terminal 100
Figure 112015115593981-pat00014
Can be deleted. The master key (
Figure 112015115593981-pat00015
) Is required, the master keys ("
Figure 112015115593981-pat00016
≪ / RTI > At this time, the master key (
Figure 112015115593981-pat00017
May be the same as the number of the second servers 700. [

The key exchanging unit 130 exchanges a secure session key with a second terminal 300, which is a recipient terminal of the messenger service, through a key exchange protocol.

Figure 112015115593981-pat00018
), And exchanges the exchanged session key (
Figure 112015115593981-pat00019
). ≪ / RTI >

The encryption / decryption unit 150 may encrypt a message transmitted to the second terminal 300 or decrypt a cipher text received from the second terminal 300. That is, the encryption / decryption unit 150 encrypts the session key

Figure 112015115593981-pat00020
Symmetric Key Encryption Algorithm Using
Figure 112015115593981-pat00021
, And the encrypted message may be transmitted to the first server 500. [ In addition, the encrypted message may be stored in a database (DB) of the first server 500. Also, the session key (
Figure 112015115593981-pat00022
Is a public key of the first terminal 100
Figure 112015115593981-pat00023
Public Key Encryption Algorithm Using
Figure 112015115593981-pat00024
And then stored in the DB of the first server 500. [

Accordingly, when the user of the first terminal 100 changes its terminal or adds a new terminal later, the user receives the values distributed from the second servers 700,

Figure 112015115593981-pat00025
), And generates the generated master key (
Figure 112015115593981-pat00026
) To generate a private key
Figure 112015115593981-pat00027
), And access to the session key and conversation contents stored in the DB of the first server 500 is possible.

Also, the encryption / decryption unit 150 encrypts the session key

Figure 112015115593981-pat00028
The second terminal 300 can decrypt ciphertexts received from the second terminal 300. [ Although the ciphertext is described as being transmitted from the second terminal 300 to the first terminal 100, the ciphertext may be transmitted to the first terminal 100 via the first server 500 according to an embodiment .

When a user of the first terminal 100 adds a new terminal and uses the messenger service, when replacing the first terminal 100 and using the messenger service with a new terminal, or when the first terminal 100 is initialized, The operation when the service is used will be described as follows. For convenience of explanation, it is assumed that the first terminal 100 is a new terminal.

The setting unit 170 of the first terminal 100 receives an installation file for receiving a messenger service from the first server 500 and transmits a predetermined application to the first terminal 100 using the received installation file Can be installed. In addition, the setting unit 170 may set basic parameters for using a predetermined encryption technique (e.g., CDE technique).

The key generation unit 110 of the first terminal 100 receives the shared values from each of the second servers 700 and receives the shared values from the master keys

Figure 112015115593981-pat00029
) Can be regenerated. At this time, an authentication procedure for confirming that the user of the first terminal 100 is a legitimate user may be preceded. Also, the key generation unit 110 generates the master key
Figure 112015115593981-pat00030
) To generate a private key
Figure 112015115593981-pat00031
) And the public key
Figure 112015115593981-pat00032
Can be generated. The generated private key (
Figure 112015115593981-pat00033
) And the public key
Figure 112015115593981-pat00034
May be stored in the first terminal 100, and the regenerated master key (
Figure 112015115593981-pat00035
May be deleted in the first terminal 100.

The encryption / decryption unit 150 of the first terminal 100 receives the encrypted session key and the encrypted message stored in the DB of the first server 500,

Figure 112015115593981-pat00036
), Decrypts the encrypted session key, decrypts the decrypted session key (
Figure 112015115593981-pat00037
) Can be used to decrypt the encrypted message. As such, key synchronization and synchronization of conversation content (i.e., messages) in a new terminal is possible.

A description will be made of a key update and a cipher text update process for hiding existing conversation contents to a person who has learned a lost terminal, such as a case where a user of the first terminal 100 has lost the first terminal 100. First, let us say that the number of updates is l (l is a natural number of 2 or more). In this case, too, the first terminal 100 is assumed to be a new terminal for convenience of explanation.

The setting unit 170 of the first terminal 100 receives an installation file for receiving a messenger service from the first server 500 and transmits a predetermined application to the first terminal 100 using the received installation file Can be installed. In addition, the setting unit 170 may set basic parameters for using a predetermined encryption technique (e.g., CDE technique).

The key generation unit 110 of the first terminal 100 receives the shared values from each of the second servers 700 and receives the shared values from the master keys

Figure 112015115593981-pat00038
) Can be regenerated. At this time, an authentication procedure for confirming that the user of the first terminal 100 is a legitimate user may be preceded.

Also, the key generation unit 110 generates the master key

Figure 112015115593981-pat00039
) To create a new private key (
Figure 112015115593981-pat00040
) And the public key
Figure 112015115593981-pat00041
). Existing private key (
Figure 112015115593981-pat00042
) Is stored in the lost terminal and key update is necessary.

The key generation unit 110 generates a count value (

Figure 112015115593981-pat00043
) And increasing the count value (
Figure 112015115593981-pat00044
) Through the existing private key (
Figure 112015115593981-pat00045
) To the new private key (
Figure 112015115593981-pat00046
), The existing public key (
Figure 112015115593981-pat00047
) To the new public key (
Figure 112015115593981-pat00048
). In the case of the count value, the first server 500, which is a service provider, may be synchronized between the first terminal 100 and the user.

After the key update process or the key generation process is completed, the encryption / decryption unit 150 updates the cipher text stored in the DB of the first server 500

Figure 112015115593981-pat00049
To the first server (500). Here, the update of the cipher text means that the existing public key (
Figure 112015115593981-pat00050
) To encrypt the encrypted session key (
Figure 112015115593981-pat00051
) To the new public key (
Figure 112015115593981-pat00052
) To encrypt the encrypted session key (
Figure 112015115593981-pat00053
). ≪ / RTI >

The first server 500 receiving the update request message from the first terminal 100 updates the cipher text stored in the DB in response to the update request message

Figure 112015115593981-pat00054
Can be performed. The first server 500 can increase the count value ("
Figure 112015115593981-pat00055
) Can be used to update the ciphertext. In case of the CDE algorithm which is an exemplary encryption algorithm, the ciphertext update can be performed through the counter value and / or the time value.

After the update process of the ciphertext is completed, the existing private key (

Figure 112015115593981-pat00056
) Can not be decrypted in the lost terminal, so that the message (conversation contents) can be synchronized in an encrypted state.

The encryption / decryption unit 150 of the first terminal 100 receives the encrypted session key and the encrypted message stored in the DB of the first server 500,

Figure 112015115593981-pat00057
), Decrypts the encrypted session key, decrypts the decrypted session key (
Figure 112015115593981-pat00058
) Can be used to decrypt the encrypted message. As such, key synchronization and synchronization of conversation content (i.e., messages) in a new terminal is possible.

Each of the configurations of the first terminal 100 shown in FIG. 2 indicates that it is functionally and logically separable, and does not necessarily mean that each configuration is divided into separate physical devices or written in separate codes. May be easily deduced by the average expert in the field of the present invention.

Also, in this specification, "part" may mean a functional and structural combination of hardware for carrying out the technical idea of the present invention and software for driving the hardware. For example, the module may mean a logical unit of a predetermined code and a hardware resource for executing the predetermined code, and does not necessarily mean a physically connected code or a kind of hardware.

The functions and configurations of the second terminal 300 may be the same as those of the first terminal 100, and thus detailed description thereof will be omitted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Messenger system
100: First terminal
110:
130: key exchange unit
150: encryption / decryption unit
170: Setting section
300: second terminal
500: first server
700: second servers

Claims (8)

A terminal for providing a messenger service,
A key generating unit for generating a master key, generating a counter using a counter value synchronized with a counter value of the first server, and a private key using the master key;
A key exchange unit for exchanging a session key with a second terminal through a predetermined key exchange scheme; And
And an encryption / decryption unit for transmitting the encrypted message to the first server using the session key,
Wherein the key generation unit distributes the master key to each of the plurality of second servers using a secret sharing scheme and transmits the distributed master key to the second server,
terminal. delete The method according to claim 1,
Wherein the encrypted message is transmitted to the second terminal via the first server,
terminal. The method according to claim 1,
Wherein the key generation unit regenerates the master key from shared values received from each of the plurality of second servers using a secret distribution method, increases the synchronized count value, and transmits the incremented count value and the master key To generate a second private key and a second public key,
Wherein the encryption / decryption unit transmits an update request message for requesting update of a cipher text stored in the first server to the first server,
Wherein the encryption / decryption unit decrypts the encrypted session key received from the first server using the second private key, and decrypts the encrypted message received from the first server using the decrypted session key,
terminal. 5. The method of claim 4,
Wherein the encrypted session key received from the first server is encrypted using the second public key.
terminal. 5. The method of claim 4,
Wherein the encrypted message received from the first server is encrypted using the session key.
terminal. A method for providing a messenger service performed in a terminal,
Generating a master key, generating a private key using the counter value synchronized with the counter value of the first server, and the master key;
Distributing and transmitting the master key to each of the plurality of second servers using a secret distribution method;
Deleting the master key in the terminal;
Exchanging a session key with a second terminal through a predetermined key exchange scheme; And
And transmitting the encrypted message to the first server using the session key. 8. The method of claim 7,
And the encrypted message is transmitted to the second terminal via the first server.
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Publication number Priority date Publication date Assignee Title
WO2021107389A1 (en) * 2019-11-29 2021-06-03 서울대학교 산학협력단 Network system and message security method thereof
US11711212B2 (en) 2021-02-17 2023-07-25 Seagate Technology Llc Post-quantum secure key-rotation for storage devices

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US20050044356A1 (en) * 1999-12-22 2005-02-24 Sunil Srivastava Method and apparatus for distributing and updating private keys of multicast group managers using directory replication
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US20140270166A1 (en) 2013-03-14 2014-09-18 Qualcomm Incorporated Master key encryption functions for transmitter-receiver pairing as a countermeasure to thwart key recovery attacks
KR101475747B1 (en) 2014-01-22 2014-12-23 고려대학교 산학협력단 Method for an outsourcing multi-party computation using homomorphic encryption
KR101541165B1 (en) * 2014-02-28 2015-08-03 고려대학교 산학협력단 Mobile message encryption method, computer readable recording medium recording program performing the method and download server storing the method

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Publication number Priority date Publication date Assignee Title
US20050044356A1 (en) * 1999-12-22 2005-02-24 Sunil Srivastava Method and apparatus for distributing and updating private keys of multicast group managers using directory replication
US20130227288A1 (en) 2009-11-06 2013-08-29 Roche Diagnostics International Ag Method and system for establishing cryptographic communications between a remote device and a medical device
US20140270166A1 (en) 2013-03-14 2014-09-18 Qualcomm Incorporated Master key encryption functions for transmitter-receiver pairing as a countermeasure to thwart key recovery attacks
KR101475747B1 (en) 2014-01-22 2014-12-23 고려대학교 산학협력단 Method for an outsourcing multi-party computation using homomorphic encryption
KR101541165B1 (en) * 2014-02-28 2015-08-03 고려대학교 산학협력단 Mobile message encryption method, computer readable recording medium recording program performing the method and download server storing the method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021107389A1 (en) * 2019-11-29 2021-06-03 서울대학교 산학협력단 Network system and message security method thereof
KR20210067208A (en) * 2019-11-29 2021-06-08 서울대학교산학협력단 Network system and method for performing message security thereof
KR102265611B1 (en) 2019-11-29 2021-06-15 서울대학교산학협력단 Network system and method for performing message security thereof
US11711212B2 (en) 2021-02-17 2023-07-25 Seagate Technology Llc Post-quantum secure key-rotation for storage devices

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