secure synchronization with trust evaluation model (stem) for wireless sensor networks

8/18/2019 Secure Synchronization With Trust Evaluation Model (STEM) for Wireless Sensor Networks

1/33

Secure Synchronization with

Trust Evaluation Model (STEM)for Wireless Sensor Networks


2/33

INDEX

•Objective

•Existing system

• Proposed system

•Dataflow Diagram

•Modules description

•Requirements


3/33

OBJECTIVE

•To obtain ealty pac!ets by "yncroni#ing

events and increasing te cloc! precision

wit energy saving for addressing te inside

treats$


4/33

EXISTING SYSTEM

• "ecure "yncroni#ation$

•%ig energy consumption$

• "O&'" is better only wen oter similar

scemes do not employ (P" devices$

•)loc! precision can still be reduced$

• *o attac!ers analysis is available$


5/33

PROPOSED SYSTEM

• +ilter te malicious data by using Dynamic En,route

filtering mecanism$

• To save energy communication in te networ! is

minimi#ed$

• -t provides more cloc! precision tan te existing

system$

• .itout explicit syncroni#ation control messages it

syncroni#e te events in te networ!$• 'ddresses attac!ers in te networ!$


6/33

System Architecture

TKM Module

Encryption orHashing

Difuser

CRYPTO Module

No-ReEnc

Full- ReEnc

Selective-ReEnc

Filtering andForwarding

Module

Full Path

Synchronization

Partial Path

Synchronization

Packets

AR!


7/33

DATA FLO

DIAGRAM

Packets

"i#e $ase% key

#anage#ent

#o%ule

rypto

#o%ule

Filter %ata For&ar% %ata

'oose

synchronization

Selective reEnc Full reEncNo reEnc

Analysis o( outsi%er

attackers

A%%ressing insi%e

threats

Healthy Packets

)alicious no%e

analysis


8/33

MOD!LES

Time &ased /ey Management 0T/M1

Module$

)R2PTO Module$+iltering 'nd +orwarding "yncroni#ation

0++"1 Module$

"elective Re,Encryption Module$

'nalysis of 'ttac!ers$


9/33

"*)E +ASE ,E )ANA.E)EN" )/D0'E

• /eys are generated dynamically using local time0localcloc! value1$

• /eys are a function of te current local time value 0tl1

and eiter an -nitiali#ation vector0-31 or previous

!ey0/ j,41$K1

t=(tl !"#)

• Te operations encryption or asing 5diffusion and

left circular sift are performed$


10/33


11/33

Packets

,ey generation

, 1t 2F3tl4*56

Encryption 4 Difusion an% shi(t

State(ul #o%e

Dyna#ic key

T-ME &'"ED /E2 M'*'(EME*T MOD67E


12/33

RP"/ )/D0'E

• "ecurity part of "TEM wic uses 'R)8

algoritm$

•/eys from T/M module is verified ere and sent

bac! to T/M if te !ey received is wrong$

• 9 Operational Modes used in te algoritm$ *o reEnc+ull reEnc"elective reEnc


13/33

)R2PTO MOD67E

Dyna#ic ,ey

",) )o%ule

5eri(y

R! Algorith#

/perational )o%es

Packets &ith ,ey

7rong key


14/33

F*'"ER*N. AND F/R7ARD*N.SNHR/N*8A"*/N )/D0'E

• -t filters te incoming pac!ets5 removes te bad

pac!et from te networ!$

•Te forwarder node5 first syncroni#e

temselves and ten forward te report$

•Te advantage is only one value is trac!ed$

• -t can properly order any report from any

source in te networ! using : values$


15/33

Selective Re-Encryption )o%ule

•Re,encryption at different ops along te data

delivery pat to te sin!$

•Transmission costs and total energy consumptionare identified$

•Tird5 +ift and sevent nodes are re,encrypted$


16/33

Analysis o( Attackers9

•Te outside malicious node will be able to

inject a false pac!et$

•)lassified based on te eavesdropping of

messages•)lassified attac!ers are

4$"ensor,class attac!ers

;$Middle,class attac!ers9$Powerful attac!ers


17/33

System Re"uireme#ts

'anguage : ;A5A "ool : NE" +EANS *DEData$ase : ) S


18/33

C$#c%usi$#

•.e relaxed te perfect syncroni#ationcondition for ."*$

•.e focused on minimi#ing te

communication in te networ!$•.e ave been able to acieve our main goal

of syncroni#ing events at a sin! as quic!ly5

accurately and surreptitiously as possible$


19/33

Future E#hceme#t

•"tudying furter more opportunities for

increasing te cloc! precision$

•/ey trials usage can furter be reduced$


20/33

Re'ere#ces

• "$R$ +lurer5 -$ Mantin5 and '$ "amir5 l .or!sop

"elected 'reas in )ryptograpy 0"')15pp$ 4,;85;??4$•

'$ 6luagac5 R$ &eya5 2$ 7i5 and @$ )opeland5


21/33

"in! and *odes (eneration


22/33

*ode "election


23/33

Pat "election

i


24/33

/ey (eneration


25/33

Encryption


26/33

)rypto Module, correct !ey

) M d l !


27/33

)rypto Module,wrong !ey


28/33

-ncoming Pac!et Reporting


29/33

-ncoming Pac!et to "-*/

" d * d -d tifi ti


30/33

"ource and *odes -dentification


31/33

Pat of Pac!et Delivery

T-)/ .i d


32/33

T-)/ .indow


33/33

(rap O6TP6T

secure synchronization with trust evaluation model (stem) for wireless sensor networks

Documents