CN102802151B - Wireless body area network symmetric key negotiation method - Google Patents
Wireless body area network symmetric key negotiation method Download PDFInfo
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- CN102802151B CN102802151B CN201210304387.0A CN201210304387A CN102802151B CN 102802151 B CN102802151 B CN 102802151B CN 201210304387 A CN201210304387 A CN 201210304387A CN 102802151 B CN102802151 B CN 102802151B
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000008569 process Effects 0.000 claims abstract description 17
- 238000012937 correction Methods 0.000 claims description 26
- 230000001360 synchronised effect Effects 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 9
- 230000009191 jumping Effects 0.000 claims description 9
- 239000000284 extract Substances 0.000 claims description 6
- 230000035479 physiological effects, processes and functions Effects 0.000 claims description 5
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 3
- 241000854291 Dianthus carthusianorum Species 0.000 claims description 3
- 230000003455 independent Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000002441 reversible effect Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 abstract description 9
- 238000000605 extraction Methods 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 5
- 239000007943 implant Substances 0.000 description 5
- 238000002513 implantation Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000001225 therapeutic effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention relates to a symmetric key negotiation method of wireless body area network, which is characterized in that node A initiates promise from node A to node B, and is characterized in that node A is in the following stateThe physiological signal is acquired at the moment, which is set asThe method comprises the steps of carrying out a first treatment on the surface of the Then according toGenerates a shared key and willTransmitting data to the node B in a hidden form; node B extractionThe physiological signals with the same time are subjected to denoising treatment, and whether the value is correct or not is verified; if the negotiation key is correct, the negotiation key is obtained; if not correct, thenAnd acquiring physiological signals nearby the moment, and continuously obtaining the secret key. The key negotiation method of the invention avoids the requirement of accurate synchronization of time and solves the problem of high energy consumption of frequent broadcasting of the synchronization signal; in the key negotiation process, most nodes only process data and do not transmit data, so that the energy consumption in the key negotiation process is effectively reduced. The method negotiates independent of entropy of signals, adopts a weak time synchronization method and a preset key technology, and has good anti-attack performance.
Description
Technical field
The present invention relates to the machinery of consultation of a kind of wireless body area network symmetric key, in particular, particularly relate to a kind of wireless body area network symmetric key machinery of consultation based on weak time synchronized and Denoising disposal.
Background technology
Wireless body area network is by the medical sensing node be deployed in human body surface and body, by intercoming mutually, a kind of micro radio sensing net that human body is formed, can be used for gathering the physiological signal (as pulse, blood pressure, blood oxygen, body temperature etc.) of human body, the attitude of monitoring human body (as walk, run, stand up, squat down).The physiology signal of collection can not only be delivered to remote medical center by wireless body area network, and can utilize these physiological signals on human body, realize intelligent therapeutic (such as accurate pharmaceutical injection), have a wide range of applications in the intelligent medical field relevant with health care, tele-medicine, movement monitoring etc.
Because wireless body area network collection, transmission are all relevant to the health of people with the data of process, implement to attack to these data, not only can cause the leakage of individual privacy, the taking place frequently of malpractice, even can threaten the life security of people.Therefore, before large-scale promotion application wireless body area network, first must solve information security issue, this very corn of a subject is then the design of symmetric key machinery of consultation.
Because wireless body area network generally adopts battery functi on to power, operation energy is few, in order to ensure the availability of wireless body area network, low energy consumption when consulting symmetric key must be guaranteed, for this reason, no matter be in the world at present or the domestic mode all adopting Human Physiology information and fuzzy technology to combine is to realize the key agreement of wireless body area network.In negotiations process, multiple node is under the control of exact time synchronization mechanism, gather physiologic information of the same type in the identical moment, and by fuzzy technology, the noise in physiologic information is processed, make between multiple node, to produce the basis of identical physiologic information as key agreement.But, although The method avoids the high energy consumption that interactively key agreement brings, there is the advantage of low energy consumption, but also there are two major defects in this technology: (1) time synchronizing signal that cannot solve under exact time synchronization mechanism frequently broadcasts brought high energy consumption problem; (2) high entropy physiologic information only can be adopted to carry out key agreement; (3) symmetric key only can be chosen from error correcting code, has significant limitation.
Summary of the invention
The present invention, in order to overcome the shortcoming of above-mentioned technical problem, provides a kind of wireless body area network symmetric key machinery of consultation based on weak time synchronized and Denoising disposal.
Wireless body area network symmetric key of the present invention machinery of consultation, if initiated to promise to undertake to Node B by node A, to complete the key agreement of node A and Node B, is characterized in that, realizes in accordance with the following methods: first node A exists
moment carries out physiological signal collection, is set to
; Then basis
produce shared key, and will
data are transmitted to Node B with the form hidden; First Node B is extracted
the physiological signal that moment is identical, through Denoising disposal, and verifies that whether the value of physiological signal is correct; As correctly, then obtain arranging key; As incorrect, then exist
obtain physiological signal near moment, continue to ask for key.
First carried out the collection of physiological signal by node A, generate shared key; Then, identical physiological signal collection is carried out in the region of Node B near synchronization or synchronization, for generating the key information carrying out with node A verifying; Denoising disposal is being carried out to collection signal.Due to Node B choose be to mutually in the same time or mutually in the same time near the physiological signal collection of time point, is more conducive to collecting identical physiological parameter, avoids the requirement to time precise synchronization, and time synchronizing signal frequently broadcasts brought high energy consumption; Meanwhile, Node B relies on calculating to obtain shared key substantially, further avoid the high energy consumption that Signal transmissions brings.
Wireless body area network symmetric key of the present invention machinery of consultation, a. sets up route, sets up the communication path between node A and Node B; B., key sum functions is set, a preset key in all nodes of wireless body area network
, a pseudo-random function
, an error correction functions
, error correcting code set and two relations
with
, wherein
reversible, x, y are independent variable; C. Time Created window
, each node is at time window
in multiple set times point all carry out physiology signal collection, and data that the data gathered in new time window gather in time window before substituting; D. gather physiological signal, node A is at actual time window
moment gathers physiological signal, if value is
; E. opening relationships formula, extracts a character code from error correcting code set
, utilize
set up
with
relation; F. relation is hidden
, produce an open random number
, and in conjunction with pseudo-random function
hide
with
relation, hiding expression formula is:
; G. obtain promise and key, node A with
,
,
,
numerical value is formed promises to undertake, and is sent to Node B, with
functional value be shared key; H. Node B gathers physiological signal, and Node B is at same time window
in
moment extracts identical physiological signal, if its value is
; I. reduce
with
relation, Node B is according to preset key
reduction
with
relation, expression formula is
; J. map with
there is noise variance
, utilize relation function
, will
and relation
be mapped as and character code
there is noise variance
, expression formula is:
; K. Denoising disposal, utilizes error correction functions
right
carry out Denoising disposal, if the functional value after process is
, then
; If
, mean denoising success, then utilize
calculate
value; M. produce shared key, Node B utilizes formula
produce shared key
, then have
, key agreement success; If n. in step k
, get
the physiological signal in neighbouring moment, with weak time synchronized physiological signal, chooses
physiological signal near moment, carries out key agreement according to step I, j, k, m; P. key agreement terminates, if the number of times of key agreement reaches L time and all do not have successfully in step n, then declares key agreement failure.
Above-mentioned step a to p gives the concrete grammar of key agreement, and in step b, each node in wireless body area network all can know key sum functions information; In step c, node carries out discrete acquisitions in time window, and the new value gathered can replace old signal value.In step f, utilize
with
relation
with by open random number
, key
the functional value drawn
phase XOR, realizes relation
hide.In step g,
,
,
,
value all open to Node B,
value be in confidential state, in order to the use of verification.Wherein, because lowercase l is all lower with the discrimination of numeral 1, alphabetical o and 0, in step, alphabetical l and alphabetical o is not adopted to mark as step.
In step h, the moment that A node sends
, concerning may past tense Node B, therefore should from the extracting data data stored; In step I, adopt
with
carry out logic XOR to reduce
with
relation; Step k, utilizes error correction functions to carry out Denoising disposal, and by inspection
rob Roy whether is become to judge denoising success or not, to calculate
value; In step n, if in the moment
the physiological signal gathered does not meet the demands, then utilize the moment
neighbouring physiological signal value is consulted again.
Disclosed cryptographic key negotiation method above, security is depended on
confidentiality and the good nature of pseudo-random function.Because wireless body area network is deployed on human body, opponent is difficult to capture this category node, preset key
there is good secret shape.And pseudo-random function all has indistinguishability with being uniformly distributed, for opponent, unpredictable go out correct symmetric key.
Wireless body area network symmetric key of the present invention machinery of consultation, if
for the gap space that disappears,
for the physiological signal after coding, and
;
for error correcting code set, for error correction character code
, have
;
for the maximum number of digits of error correcting code set energy error correction;
be two independents variable
with
between statistical distance; Error correction functions described in step b
meet: for
,
, and
, then have
.
Like this, error correction functions is passed through in step k
to the physiological signal that Node B gathers
correction process, the interfering signal that just B node can be subject to remove, be conducive to guarantee two node gather physiological signal equal.
Wireless body area network symmetric key of the present invention machinery of consultation, described in step b
with
function is XOR function.?
,
when being XOR function, if two nodes collections
with
the error of existence be
; Then have,
,
, due to
for the character code of in error correction set, error correction functions
will
error correction is
.
Wireless body area network symmetric key of the present invention machinery of consultation, in described step g, the promise form that node A sends to Node B is:
.Promise can adopt multiple different form to send.
Wireless body area network symmetric key of the present invention machinery of consultation, described Route establishment step a, if node A is node to be added, if wireless body area network is tufted structure, then set up route according to following steps: a-1-1. node A sends broadcast towards periphery, to find suitable bunch head; If a-1-2. C is the leader cluster node receiving A broadcast, then node C is by its energy
, nodes in this bunch
feed back to node A; If a-1-3. Node B added C bunch, then Node B is by its energy
, router tasks number
, be sent to node A to the jumping figure of bunch head; A-1-4. on each path, the ratio that node A compute cluster head node and bunch internal segment are counted
;
A-1-5., on each path, node A calculates the average energy of all routing nodes in each forwarding task
;
A-1-6. choose suitable bunch head, be in same paths, note
, select
node corresponding during acquisition maximum as a bunch head, and sets up route; If wireless body area network is network structure, node E is destination node, then set up route according to following steps: a-2-1. node A sends broadcast towards periphery, to search out the suitable route of node E; If a-2-2. node D is the routing node of node A to node E, then node D is by its energy
, router tasks number
, be sent to node E to the jumping figure of bunch head;
A-2-3. choose route, node E to calculate on every paths corresponding
, choose
be worth the communication path of maximum path as A to E.
The invention has the beneficial effects as follows: (1) cryptographic key negotiation method of the present invention, by the moment
and the moment
the collection of identical physiologic information is carried out in neighbouring region, have more reasonability, avoid the necessary smart quasi synchronous requirement of time in wireless body area network, solve because time synchronizing signal frequently broadcasts brought high energy consumption problem, also improve the successful probability of key agreement simultaneously; (2) in the process of key agreement, node major part just carries out the process of data, does not transmit wirelessly frequently and receives, and significantly reduces the energy ezpenditure in cipher key agreement process; (3) high entropy physiologic information both can have been adopted to carry out key agreement, also low entropy can be adopted, the uncertain physiologic information of entropy carries out the negotiation of key even, extends the kind of the physiologic information that can be used for key agreement, and the negotiation of key and the entropy of physiologic information are had nothing to do; (4) have employed the noise physiological signal synchronous method of weak time synchronized, not only solve the huge transmission energy consumption problem that exact time synchronization is brought, and make, when the noise variance of the physiological signal gathered is excessive, the key of mistake can not be produced, saved calculating energy consumption; (5) have employed preset key technology, be conducive to node certification mutually, and the attack based on physiological signal telemetry can be resisted; (6) restriction must extracting key in previous methods from error correcting code set is breached.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of wireless body area network symmetric key of the present invention machinery of consultation;
Fig. 2 is the mixed topology structural representation of tufted and mesh network in the present invention;
Fig. 3 is the principle schematic of leading to bunch footpath, parting in the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1, give the schematic diagram of wireless body area network symmetric key of the present invention machinery of consultation, if initiated to promise to undertake to Node B by node A, to complete the key agreement of node A and Node B, realize in accordance with the following methods: first node A exists
moment carries out physiological signal collection, is set to
; Then basis
produce shared key, and will
data are transmitted to Node B with the form hidden; First Node B is extracted
the physiological signal that moment is identical, through Denoising disposal, and verifies that whether the value of physiological signal is correct; As correctly, then obtain arranging key; As incorrect, then exist
obtain physiological signal near moment, continue to ask for key.Concrete, can be realized by following steps:
A. set up route, set up the communication path between node A and Node B;
B., key sum functions is set, a preset key in all nodes of wireless body area network
, a pseudo-random function
, an error correction functions
, error correcting code set and two relations
with
, wherein
reversible, x, y are independent variable;
C. Time Created window
, each node is at time window
in multiple set times point all carry out physiology signal collection, and data that the data gathered in new time window gather in time window before substituting;
D. gather physiological signal, node A is at actual time window
moment gathers physiological signal, if value is
;
E. opening relationships formula, extracts a character code from error correcting code set
, utilize
set up
with
relation;
F. relation is hidden
, produce an open random number
, and in conjunction with pseudo-random function
hide
with
relation, hiding expression formula is:
;
G. obtain promise and key, node A with
,
,
,
numerical value is formed promises to undertake, and is sent to Node B, with
functional value be shared key;
The promise form that node A sends to Node B can be:
.Promise can adopt multiple different form to send.
H. Node B gathers physiological signal, and Node B is at same time window
in
moment extracts identical physiological signal, if its value is
;
I. reduce
with
relation, Node B is according to preset key
reduction
with
relation, expression formula is
;
J. map with
there is noise variance
, utilize relation function
, will
and relation
be mapped as and character code
there is noise variance
, expression formula is:
;
K. Denoising disposal, utilizes error correction functions
right
carry out Denoising disposal, if the functional value after process is
, then
; If
, mean denoising success, then utilize
calculate
value;
M. produce shared key, Node B utilizes formula
produce shared key
, then have
, key agreement success;
If n. in step k
, get
the physiological signal in neighbouring moment, with weak time synchronized physiological signal, chooses
physiological signal near moment, carries out key agreement according to step I, j, k, m;
P. key agreement terminates, if the number of times of key agreement reaches L time and all do not have successfully in step n, then declares key agreement failure.
Wherein, if
for the gap space that disappears,
for the physiological signal after coding, and
;
for error correcting code set, for error correction character code
, have
;
for the maximum number of digits of error correcting code set energy error correction;
be two independents variable
with
between statistical distance; Error correction functions described in step b
meet: for
,
, and
, then have
.Like this, error correction functions is passed through in step k
to the physiological signal that Node B gathers
correction process, the interfering signal that just B node can be subject to remove, be conducive to guarantee two node gather physiological signal equal.
for
pseudo-random function; Order
,
, and
,
for
possibility of reversal relation function, and to have
.
for
relation function.
Described in step b
with
function is XOR function.?
,
when being XOR function, if two nodes collections
with
the error of existence be
; Then have,
,
, due to
for the character code of in error correction set, error correction functions
will
error correction is
.
In order to illustrate technical scheme of the present invention further, be described in detail below:
Fig. 2 gives the mixed topology structure of tufted and mesh network, in the design, general employing volume is comparatively large, run the relatively many body surface nodes of resource as leader cluster node, and implant node with multi-hop mode add that certain body surface node formed bunch, to meet the demand of long distance monitoring.In addition, the node of different bunches can form the network structure of multiple multi-hop transmission, to meet the demand that multi-node collaboration implements intelligent therapeutic.
Because bunch head energy is many, its transmission range is greater than implantation node, this make to be in implantation node in bunch head communication range often cannot directly with bunch head communication.For this reason, a kind of " broadcast feedback " method is adopted, to implant node finding suitable bunch head and route, as shown in Figure 3; Implant node A and first find bunch head by broadcast, if bunch head C is positioned at 1 hop distance of A, then C is by bunch key
, its energy
, nodes in this bunch
a is fed back to for information about with after preset key protection.If A is in the time period
inside do not receive feedback message, then repeated broadcast, now, if implant Node B added C bunch, then B is by its energy
, router tasks
(number of times as route), to the jumping figure of bunch head, and the information feed back such as the energy of the superior node of B, router tasks is to A.This process as shown in Figure 3.
In " broadcast feedback " method, implant node A and can receive from different bunch head and the feedback message of implantation node serving as route, then adopt following concrete grammar to search out best bunch head and path:
A-1-1. node A sends broadcast towards periphery, to find suitable bunch head;
If a-1-2. C is the leader cluster node receiving A broadcast, then node C is by its energy
, nodes in this bunch
feed back to node A;
If a-1-3. Node B added C bunch, then Node B is by its energy
, router tasks number
, be sent to node A to the jumping figure of bunch head;
A-1-4. on each path, the ratio that node A compute cluster head node and bunch internal segment are counted
;
A-1-5., on each path, node A calculates the average energy of all routing nodes in each forwarding task
;
A-1-6. choose suitable bunch head, be in same paths, note
, select
node corresponding during acquisition maximum as a bunch head, and sets up route.
The advantage of the method is: when the jumping figure in multiple path is identical, A by selecting the highest path of E, to balance the overall energy consumption of body feel network; When ENERGY E is identical, the path that A will select jumping figure minimum, thus guarantee the highest efficiency of transmission.
If wireless body area network is network structure, node E is destination node, then set up route according to following steps:
A-2-1. node A sends broadcast towards periphery, to search out the suitable route of node E;
If a-2-2. node D is the routing node of node A to node E, then node D is by its energy
, router tasks number
, be sent to node E to the jumping figure of bunch head;
A-2-3. choose route, node E to calculate on every paths corresponding
, choose
be worth the communication path of maximum path as A to E.
Under supposing fully connected topology, body feel network node predicts the identity of the node communicated with.Because mesh topology is used for specific internodal intelligent therapeutic, therefore this hypothesis is rational.Suppose accordingly, building the cancellated key of safe multi-hop is set up multihop routing and arranging key between two known nodes.In detail, realize by following five steps:
The first step, node A utilizes fuzzy technology produce the promise needed for arranging key and broadcast; Broadcast message also comprises the type of the physiological signal for arranging key, collected time point
and the mark of Correspondent Node.
Second step, if E is in 1 hop distance of A, and finds that oneself is at time point
near acquire the physiological signal of identical type, then utilize and produce identical key based on the noise physiological signal synchronous method of weak time synchronized and fuzzy technology.
3rd step if D is in 1 hop distance of A, and is not destination node, then D broadcast forwards the message of A, together with the router tasks and the energy that also have D that forward.
4th step, if node E and A at a distance of multi-hop distance, then finally may receive the message from A from multiple path, so B need calculate every paths
, and select energy
maximum path is as the path communicated with A.Then utilize and calculate based on the noise physiological signal synchronous method of weak time synchronized and fuzzy technology the key shared with A
.
5th step, when E and A carries out secret communication, by enciphered data by its selected route, sends to A in a multi-hop fashion.
In some applications, there is A and only send information, E only receives the situation of information, in this case, can specify the negotiation being initiated shared key by E.
Cryptographic key negotiation method of the present invention, by the moment
and the moment
the collection of identical physiologic information is carried out in neighbouring region, have more reasonability, avoid the necessary smart quasi synchronous requirement of time in wireless body area network, solve because time synchronizing signal frequently broadcasts brought high energy consumption problem, also improve the successful probability of key agreement simultaneously; In the process of key agreement, node major part just carries out the process of data, does not transmit wirelessly frequently and receives, and significantly reduces the energy ezpenditure in cipher key agreement process.
Claims (5)
1. a wireless body area network symmetric key machinery of consultation, if initiated to promise to undertake to Node B by node A, to complete the key agreement of node A and Node B, realizes: first node A exists in accordance with the following methods
moment carries out physiological signal collection, is set to
; Then basis
produce shared key, and will
data are transmitted to Node B with the form hidden; First Node B is extracted
the physiological signal that moment is identical, through Denoising disposal, and verifies that whether the value of physiological signal is correct; As correctly, then obtain arranging key; As incorrect, then exist
obtain physiological signal near moment, continue to ask for key; It is characterized in that, specifically comprise the following steps:
A. set up route, set up the communication path between node A and Node B;
B., key sum functions is set, a preset key in all nodes of wireless body area network
, a pseudo-random function
, an error correction functions
, error correcting code set and two relations
with
, wherein
reversible, x, y are independent variable;
C. Time Created window
, each node is at time window
in multiple set times point all carry out physiology signal collection, and data that the data gathered in new time window gather in time window before substituting;
D. gather physiological signal, node A is at actual time window
moment gathers physiological signal, if value is
;
E. opening relationships formula, extracts a character code from error correcting code set
, utilize
set up
with
relation;
F. relation is hidden
, produce an open random number
, and in conjunction with pseudo-random function
hide
with
relation, hiding expression formula is:
;
G. obtain promise and key, node A with
,
,
,
numerical value is formed promises to undertake, and is sent to Node B, with
functional value be shared key;
H. Node B gathers physiological signal, and Node B is at same time window
in
moment extracts identical physiological signal, if its value is
;
I. reduce
with
relation, Node B is according to preset key
reduction
with
relation, expression formula is
;
J. map with
there is noise variance
, utilize relation function
, will
and relation
be mapped as and character code
there is noise variance
, expression formula is:
;
K. Denoising disposal, utilizes error correction functions
right
carry out Denoising disposal, if the functional value after process is
, then
; If
, mean denoising success, then utilize
calculate
value;
M. produce shared key, Node B utilizes formula
produce shared key
, then have
, key agreement success;
If n. in step k
, get
the physiological signal in neighbouring moment, with weak time synchronized physiological signal, chooses
physiological signal near moment, carries out key agreement according to step I, j, k, m;
P. key agreement terminates, if the number of times of key agreement reaches L time and all do not have successfully in step n, then declares key agreement failure.
2. wireless body area network symmetric key according to claim 1 machinery of consultation, is characterized in that: establish
for the gap space that disappears,
for the physiological signal after coding, and
;
for error correcting code set, for error correction character code
, have
;
for the maximum number of digits of error correcting code set energy error correction;
be two independents variable
with
between statistical distance; Error correction functions described in step b
meet: for
,
, and
, then have
.
3. wireless body area network symmetric key according to claim 1 and 2 machinery of consultation, is characterized in that: described in step b
with
function is XOR function.
4. wireless body area network symmetric key according to claim 1 and 2 machinery of consultation, is characterized in that: in described step g, and the promise form that node A sends to Node B is:
.
5. wireless body area network symmetric key according to claim 1 machinery of consultation, is characterized in that: described Route establishment step a, if node A is node to be added, if wireless body area network is tufted structure, then sets up route according to following steps:
A-1-1. node A sends broadcast towards periphery, to find suitable bunch head;
If a-1-2. C is the leader cluster node receiving A broadcast, then node C is by its energy
, nodes in this bunch
feed back to node A;
If a-1-3. Node B added C bunch, then Node B is by its energy
, router tasks number
, be sent to node A to the jumping figure of bunch head;
A-1-4. on each path, the ratio that node A compute cluster head node and bunch internal segment are counted
;
A-1-5., on each path, node A calculates the average energy of all routing nodes in each forwarding task
;
A-1-6. choose suitable bunch head, be in same paths, note
, select
node corresponding during acquisition maximum as a bunch head, and sets up route;
If wireless body area network is network structure, node E is destination node, then set up route according to following steps:
A-2-1. node A sends broadcast towards periphery, to search out the suitable route of node E;
If a-2-2. node D is the routing node of node A to node E, then node D is by its energy
, router tasks number
, be sent to node E to the jumping figure of bunch head;
A-2-3. choose route, node E to calculate on every paths corresponding
, choose
be worth the communication path of maximum path as A to E.
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| CN102932154B (en) * | 2012-11-29 | 2015-07-15 | 中国地质大学（武汉） | Lightweight encryption method and system for sensor gateway nodes of body area network |
| CN103596174B (en) * | 2013-11-04 | 2017-03-01 | 中国计量学院 | Pairwise key production method |
| CN103888943B (en) * | 2014-04-09 | 2017-09-29 | 西安电子科技大学 | Wireless body area network cryptographic key negotiation method for medical monitoring |
| DE102014208964A1 (en) * | 2014-05-13 | 2015-11-19 | Robert Bosch Gmbh | Method for generating a key in a network as well as network subscribers established for this purpose |
| CN105515765B (en) * | 2015-12-09 | 2018-08-10 | 西安电子科技大学 | The biological secret key generation method of adaptive dynamic quantization |
| EP3440802A4 (en) * | 2016-04-05 | 2019-11-27 | Tfor LLC | A transencrypting method and apparatus for removing information from data transmitted over networks and stored in data storage facilities |
| CN110730453B (en) * | 2019-09-20 | 2022-03-04 | 中国科学院深圳先进技术研究院 | Wireless body area network, key generation method, key distribution method and related device thereof |
| CN110753342B (en) * | 2019-10-18 | 2022-05-13 | 武汉大学 | Body area network equipment authentication and key agreement method based on channel characteristics |
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