KR101602497B1 - Method for providing mac protocol for data communication security in wireless network communication - Google Patents

Abstract

A method for providing a MAC protocol for securing data communication in a wireless network communication system, the method comprising: transmitting a time stamp for time synchronization and a key seed for encryption at a data transmission node; Generating a RTS (request to send) message data frame including the RTS message data frame in a data field area and transmitting the RTS message data frame to a data receiving node; Generates a timestamp and a key seed value based on the demodulated value, and stores it in a data field area of a clear to send (CTS) message data frame and transmits it to a node that has transmitted the RTS message data frame A time stamp received at the data transmission node receiving the CTS message data frame, And performing a change to the channel and a duration according to the value.

Frequency hopping, channel negotiation, time slot

Description

[0001] METHOD FOR PROVIDING MAC PROTOCOL FOR DATA COMMUNICATIONS IN A WIRELESS NETWORK COMMUNICATION SYSTEM [0002] METHOD FOR PROVIDING DATA PROTOCOL FOR SECURITY IN WIRELESS NETWORK COMMUNICATION [

 The present invention relates to a method of providing a MAC protocol for securing data communication in a wireless network communication system, and more particularly, to an encryption algorithm for securing data communication in a MAC protocol (Mac protocol) It is applied to channel negotiation of frequency hopping scheme and channel time slot to reduce the probability of tapping at the physical layer of the transmitting / receiving node in data communication and to secure the data communication in the wireless network communication system which refrains from tapping. The present invention relates to a method of providing a Mac protocol for a mobile terminal.

Due to diversification of communication environment such as mobile network, home network, etc., the stability of information security between communication devices is one of the major concerns. Such an IP-based communication environment has been developed in order to improve convenience for users, but at the same time, access to third parties is easy and information security is weak.

In order to solve this problem, various types of encryption algorithms exist in the data communication service currently provided by the wireless network communication system.

In the wireless network, the encryption algorithm is applied for encryption communication, and the entire data is encrypted with software or hardware to transmit / receive the data message. In this process, the processes for encryption and management perform communication efficiency and speed of the wireless network In addition to being able to drop, network devices suffer from inefficient power consumption due to complex encryption algorithms for handling the encrypted messages.

In the currently used wireless network communication, the encryption MAC (Media Access Control) protocols encrypt and process all the data in the channel negotiation and the channel duration, that is, the time slot allocation process. In order to maintain the encryption state There is a security vulnerability that can be exploited in distributing the encryption key.

In the encryption MAC protocol, the management of the encryption key is very important. For example, in the centralized key generation method, a key distribution server exists to allocate an individual key to a plurality of nodes forming a network. Or hardware. Therefore, if a problem occurs in the key distribution server, the entire network is affected, and the self-organized network in which the nodes forming the network arbitrarily join or leave the network is applied This is difficult. Here, the autonomous-subscription network is represented by an ad-hoc network and a mesh network.

In addition, when a new node participates in a network, not only a participating new node but all the nodes forming the network simultaneously update the key, so that the computation complexity is high, and the key is exposed to the third party The vulnerability occurs in the process of distributing to a cryptographic communication partner.

As described above, the problem with the encryption techniques by the current key management is that the communication process prior to the formation of the wireless network is assumed to be secure, and only the encryption and cipher key management are concentrated. The inefficient power consumption is caused in terms of the communication efficiency and speed of the wireless network.

It is an object of the present invention to provide a MAC protocol for data communication security in a wireless network communication system, and more particularly, to a method of providing a MAC protocol for data communication in a wireless network communication system, In addition, by blocking the possibility of being attacked, the encryption algorithm for securing the data communication in the Mac protocol is applied to the channel negotiation of the frequency hopping method and the channel time slot, To a method of providing a MAC protocol for securing data communication in a wireless network communication system which rejects the eavesdropping probability of the sending / receiving node at the physical layer.

According to one aspect of the present invention, there is provided a method of providing a MAC protocol for securing data communication in a wireless network communication system, the method comprising: generating a time stamp for a time synchronization (sync) Generating an encrypted key seed value for encryption to generate a RTS (request to send) message data frame by including it in a data field area, and transmitting the RTS message data frame to a data receiving node; The time stamp and the key seed value are generated based on the time stamp and the key seed value, and the time stamp and the key seed value are included in the data field area of the CTS (clear to send) message data frame. Transmitting the RTS message data frame to a node that has transmitted the CTS message data frame; And performing a change to the channel and a duration according to the time stamp value received at the received data transmission node.

As described above, according to the present invention, it is possible to perform 1: 1 time synchronization between data transmitting / receiving nodes that do not load the entire network by channel division according to time in a wireless network communication system, Not only the transmission failure is reduced but also the address of each node is not used due to the 1: 1 time synchronization, so that it is possible to prevent the possibility of being attacked from the outside.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be appreciated that those skilled in the art will readily observe that certain changes in form and detail may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims. To those of ordinary skill in the art.

The present invention relates to a method and apparatus for performing secure data communication in a wireless network using a CSMA / CD (Carrier Sense Multiple Access / Collision Detect) protocol based on the IEEE 802.3 standard. More particularly, Negotiations and time slots to reduce the probability of intercepting at the physical PHY level and to refrain from intercepting network communications.

Also, in implementing the present invention, all nodes in the wireless network communication have previously distributed pre-shared keys that can decrypt key authentication and key seed for data security Assumption.

Hereinafter, a structure of a data frame transmitted / received in a wireless network according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.

First, FIG. 1 is a structure showing a general structure of a data frame 100 transmitted in data communication in a wireless network communication system based on a MAC protocol encryption algorithm according to an embodiment of the present invention.

1, the data frame 100 includes a preamble field 110 for providing frame arrival notification information on a receiving side, a message type 112 for specifying a type of data, A source address field 114 indicating the physical address of the source, a destination address field 116 indicating the physical address of the destination, a data length 118 indicating the length of the data, A data field 120 for data received from an upper layer, and a cyclic redundancy check field 122 for error detection.

2 is a structure of a data frame for each transmitting / receiving node in data communication in a wireless network communication system based on a MAC protocol encryption algorithm according to an embodiment of the present invention.

Referring to FIG. 2, 200 is a request to send (RTS) message data frame, and the RTS message data frame 200 is generated at a transmitting node to transmit data.

1, the RTS message data frame 200 sets a message type field designating the type of data in the data frame 100 shown in FIG. 1 to RTS, and a data field 206 for data is set to time synchronization A time stamp 202 field, and a key seed field 204 field.

The time stamp 202 field is an area for time synchronization between nodes for data transmission / reception.

That is, this is an area for matching the time relationship on the time domain, not the frequency domain, between the two space and time-varying data transmitting / receiving nodes, and is an exact match for the current time (hour / minute / second). Here, time synchronization means one-to-one time synchronization between communicating nodes, rather than absolute synchronization over the entire network.

The key seed (204) value field is an area for a key seed value generated by encrypting for communication security upon data transmission / reception.

Here, it is possible to apply various existing encryption algorithms for encrypting the key seed value. In the present invention, the cryptographic method of Francis Bacon will be described as an example.

The Francis bacon cipher uses the upper case letter of the English alphabet and the lower case letter of the English alphabet. For example, if the key seed value is 0x06 in hexadecimal, it is 0b0000 0101 in binary. SaFe can be symmetric with SAFE SaFe, and since SAFE is all upper case, it can be expressed as 0000, SaFe is upper case, lower case, upper case, lower case.

Next, 210 is a clear to send (CTS) message data frame, and the CTS message data frame 210 is generated at a receiving node receiving data from the transmitting node.

1, the CTS message data frame 210 sets a message type field designating a type of data to a CTS in a data frame 100 shown in FIG. 1, and a data field 208 for data sets a time synchronization And a key seed (214) value area field.

The time stamp field 212 is an area for time synchronization between nodes for data transmission / reception. Here, time synchronization means one-to-one time synchronization between communicating nodes, rather than absolute synchronization over the entire network.

The key seed (214) value area field is an area for a key seed value generated by encrypting for communication security when data is transmitted / received, and can be applied to various encryption algorithms. In the present invention, Francis Bacon ) Will be described as an example.

Next, 220 is a Tx complete message data frame, and the Tx complete message data frame 220 is for notification of data transmission completion.

In the data frame 100 shown in FIG. 1, a message type field designating the type of data is set to a Tx complete message, and data is not included, and is generated upon completion of data transmission at each of the transmitting and receiving nodes.

FIG. 3 is an exemplary diagram schematically showing frequency hopping (FH) for each node on a wireless channel in a data communication between a transmitting / receiving node in a wireless network according to an embodiment of the present invention.

Here, the frequency hopping is a spreading band method in which the center frequency of the transmission signal is continuously shifted within a specific frequency band. In the present invention, since a given frequency band is divided and used according to time, .

Referring to FIG. 3, a node that transmits or receives data is configured to transmit RTS (request to send) message data frames B, C, and E and CTS message data frames A and D , F) to the node to be transmitted. The data transmitting / receiving nodes attempting to transmit on the common channel 310 means initialization of communication over time, and using the time set in the time stamp (212) area of each RTS or CTS message data frame Communication will be performed. Therefore, each data transmitting / receiving node occupying a certain area in each of the plurality of divided channels 312, 314, and 316 shown in FIG. 3 means occupation for a specific time on the corresponding channel, This means that a plurality of channels are divided and used according to time. For example, after the nodes (ie, A and C) desiring to communicate using the common channel 310 receive RTS and CTS message data frames for data transmission / reception, respectively, Node A occupies a specific time of channel 2 314 and channel 3 316 based on the time set in the timestamp region of each RTS and CTS message data frame received via channel 1 312 and C node receives channel 1 312, And channel 3 (316).

A detailed description of the channel allocation method according to the present invention and a MAC protocol method for securing data communication in a wireless network communication system according to an embodiment of the present invention will be described in detail with reference to FIG. 4 and FIG.

4 is a flowchart illustrating an operation procedure of a data transmitting node in a method of providing a MAC protocol for securing data communication in a wireless network communication system according to an embodiment of the present invention.

Referring to FIG. 4, first, in step 410, communication initialization for data communication is performed, that is, each node is in a standby state. In step 412, data to be transmitted to a node And generates an RTS message data frame using a common channel for channel negotiation for communication. At this time, in the RTS message data frame, a message type field designating a type of data is set to RTS, and a data field for data includes a time stamp area and a key seed value area field, respectively.

The time stamp area is an area for time synchronization between nodes for data transmission / reception. The time stamp area is an area for coincidence of time relations on a time domain, not a frequency domain, between data transmission / reception nodes of two space and time , And the current time (hour / minute / second). Accordingly, the data transmission node designates the time to be used by the data transmission node, and records the time in the time stamp field.

Here, the time synchronization according to the embodiment of the present invention means one-to-one time synchronization between communicating nodes, not absolute synchronization on the whole network.

The key seed value field field is an area for a key seed value generated by encrypting for communication security upon data transmission / reception.

When encrypting the key seed value, Francis Bacon's cryptographic method is used, and the key seed value encrypted by the algorithm is modulated for transmission.

In step 414, the RTS message data frame generated in step 412 is transmitted to the receiving node.

In step 416, if it is determined that the CTS message data frame is received from the node that transmitted the RTS message data frame in step 414, the process proceeds to step 422.

In the CTS message data frame, the message type field is set to CTS. The data field is the same as the data field of the RTS message data frame including a time stamp area for time synchronization between nodes and a key seed value area field generated by encryption for security.

If the CTS data frame is not received from the node that transmitted the data frame, the process moves to step 420. In step 412, when the RTS message is generated in the reception waiting state, the CTS message data frame is continuously confirmed by confirming the set time and within the set time. If the set time has elapsed in this process, the node jumps to step 412 and re-generates the RTS message data frame using the common channel for channel negotiation for data communication with the data receiving node to communicate with do.

On the other hand, in step 422, after the CTS message data frame is received, the data transmitting node performs channel negotiation using the key seed value and the time stamp information value included in the received CTS message data frame for data communication with the receiving node And information on the channel duration.

In operation 424, the data transmitting node operates the channel change and channel duration timer using the key seed value and the time stamp information value.

In step 424, the channel is changed, and the carrier sensing of the corresponding channel is performed to check the frequency of use in the channel to be changed, that is, whether or not the other node is used. As a result of checking, when the corresponding channel is being used by another node at a time corresponding to the channel time to be used by the data transmitting node, that is, the time stamp information value included in the received CTS message data frame, In order to occupy the channel on the channel time, the UE jumps to the previous 412 process, that is, returns to the common channel, regenerates the RTS message data frame, and repeats the processes of 412 and below.

If the corresponding channel is empty at a time desired by the data transmission node, the time stamp information value included in the CTS message data frame is set to the time designated in step 412 by the channel information acquired in step 422 The timer value is set by adding the stamp value to determine the final channel duration (step 427).

In step 428, if the data transmission node transmits data to the receiving node to which it is to communicate and completes all the data to be transmitted within the determined final channel duration, the data transmitting node transmits a Tx complete message And notifies completion of data transmission between the transmission / reception nodes (step 430).

The Tx complete message sets a message type field for specifying a type of data in a MAC data frame to a Tx complete message, does not include data, and is generated upon completion of data transmission at each of the transmitting and receiving nodes.

5 is a flowchart illustrating an operation procedure of a data receiving node in a method of providing a MAC protocol for securing data communication in a wireless network communication system according to an embodiment of the present invention.

Referring to FIG. 5, in step 510, communication initialization for data communication is performed, that is, each node to communicate with is in a standby state. In step 512, it is checked whether a RTS data message frame is received from a predetermined node in the wireless network do.

At this time, in the RTS message data frame, a message type field designating a type of data is set to RTS, and a data field for data includes a time stamp area and a key seed value area field, respectively. (Step 514). In step 514, the data transmitting node demodulates the values of the time stamp area and the key seed value field included in the modulated RTS message data frame to obtain the channel and duration information to be communicated by the data transmitting node.

In step 516, the time stamp value in the RTS message data frame received from the data transmission node is compared with the time stamp value of the RTS message data frame, thereby correcting the time synchronization, that is, the error with the received time stamp value. Here, time synchronization means one-to-one time synchronization between communicating nodes, rather than absolute synchronization over the entire network.

In step 518, the data receiving node encrypts and modulates the CTS message data frame with the corrected timestamp value and the key seed value. The modulated CTS message data frame is transmitted to a node that has transmitted the RTS message data frame (operation 520).

In step 522, the data receiving node changes its channel according to the channel information included in the received RTS message data frame and the time stamp value corrected in step 516, and then starts its own timer.

After the start of the timer, whether or not data is received from the data transmitting node is checked (step 524). If the data is not received, whether or not the timer is operated is continuously checked (step 526) Continue to check.

At this time, if the set time is over, the data receiving node informs the receiving node of the completion of data transmission between the transmitting node and the receiving node by transmitting a TX complete message (operation 528).

When data is received from the data transmission node, the received data is processed (step 530), and the communication with the data transmission node is terminated.

As described above, in the wireless network communication system according to the embodiment of the present invention, operations related to the method of providing a MAC protocol for securing data communication can be performed. While the present invention has been described with respect to specific embodiments thereof, Branching modifications can be made without departing from the scope of the present invention.

Accordingly, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by equivalents of the claims and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a general structure of a data frame transmitted in data communication in a wireless network communication system based on a MAC protocol encryption algorithm according to an embodiment of the present invention; FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a wireless network communication system based on a MAC protocol encryption algorithm, and more particularly,

FIG. 3 is an exemplary diagram schematically showing frequency hopping (FH) for each node on a wireless channel in a data communication between a transmitting / receiving node in a wireless network according to an embodiment of the present invention;

4 is a flowchart illustrating an operation procedure of a data transmitting node in a method of providing a MAC protocol for securing data communication in a wireless network communication system according to an embodiment of the present invention.

FIG. 5 is a flowchart illustrating an operation procedure of a data receiving node in a method of providing a MAC protocol for securing data communication in a wireless network communication system according to an embodiment of the present invention. FIG.

Claims (14)

A method for providing a MAC protocol for securing data communication in a wireless network communication system, The data transmitting node generates a time stamp for time synchronization and an encrypted key seed value for encryption and transmits a request to send message data RTS Generating a frame and transmitting the generated frame to a data receiving node; After receiving the RTS message data frame, the data receiving node demodulates the time stamp and the key seed value and generates the time stamp and the key seed value based on the time stamp and the key seed value to generate a data field of a clear to send (CTS) And transmitting the RTS message data frame to a node that has transmitted the RTS message data frame; And activating a change to a channel and a channel duration timer according to a time stamp value received at a data transmission node receiving the CTS message data frame. How to provide Mac protocols. The method according to claim 1, Wherein the data transmission node further comprises the step of initiating an operation of a timer of the RTS message data frame according to the set time stamp when generating the RTS message data frame. Protocol provisioning method. The method according to claim 1, Wherein the data transmitting node further comprises a step of continuously checking a timeout of the timer of its own timer when the CTS message data frame is not received from the node that has transmitted the RTS message data frame. A method for providing a Mac protocol for securing data communication in a system. The method according to claim 1, When a message type field designating a data type is set to a Tx complete message and a Tx complete message data frame not including data is received in any one of data transmission and reception nodes, The method comprising the steps of: providing a MAC protocol for data communication security in a wireless network communication system. The method of claim 1, wherein the transmission of the RTS and CTS message data frames is performed on a common channel in a wireless network. The method of claim 1, wherein the time stamp values of the RTS and CTS message data frames are one-to-one time synchronization between nodes transmitting and receiving data. Protocol provisioning method. The method according to claim 1, Wherein the data transmission node further includes a step of checking whether the corresponding channel time is used by another node after carrier sensing of a channel corresponding to a channel time to be changed, A method for providing a Mac protocol for data communication security. The method according to claim 1, Wherein when the corresponding channel to be changed by the data transmitting node is being used by another node, the wireless terminal returns to the common channel and regenerates the RTS message data frame. . The method according to claim 1, Wherein the time stamp value for the CTS message data frame of the data receiving node is set after correcting an error through comparison with a time stamp value of the received RTS message data frame. How to provide a Mac protocol. The method according to claim 1, Wherein the data receiving node changes the time stamp value of the RTS and CTS message data frames to a corresponding channel time through comparison and error correction and starts its timer at the changed time. A method for providing a Mac protocol for a mobile terminal. 11. The method of claim 10, Wherein the data receiving node continuously confirms whether data is received for a predetermined time from the data transmitting node after the timer starts, in the wireless network communication system. The method according to claim 1, Wherein the key seed value is generated by being applied to an encryption algorithm. The method of claim 1, wherein the data transmitting / receiving node performs data communication in a wireless network using a CSMA / CD (Carrier Sense Multiple Access / Collision Detect) protocol based on the IEEE 802.3 standard. A method of providing a Mac protocol for communication security in a new system. The method of any one of claims 1 to 12, wherein the channels are divided according to time.

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