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Name of student: Muhammad Saleh Bhutto
Department:Information Technology Centre
Title: Investigating the effects of black hole attack in MANET under 802.11b and TDMA Protocols
Rationale/Problem Statement:
Wireless networks are unit fast quality to its top nowadays, because subscribers need a WiFi network independent of their physical role. It may be
growing chance of attacks on the Mobile Ad-hoc Networks (MANET). A black hole is one of the security dangers within that movement data is
diverted to such a hub, to the point that truly doesn't exist within the network. It's a similarity to the blackhole within the universe in which things
vanish. The hub gives itself in such a route to the hub that it may assault different hubs and systems, realizing that it has the most limited way.
MANETs need a protected route for transmission and correspondence which is very testing and indispensable problem. Keeping in mind the end
goal to give secure correspondence and transmission, scientist worked particularly on the security issues in MANETs, and several safe protocols
for safe route inside the networkhad been suggested.Already the works finished on protection problems in MANET depended mostly on routing
protocol like Ad-Hoc On Demand Distance Vector (AODV), Distance-Sequence Distance-Vector (DSDV) Dynamic Source Routing (DSR) and
Optimized Link State Routing Protocol (OLSR). Various types of assaults were examined, and their outcomes were elaborated through the usage
of putting forward how those attacks upset the execution of MANET. This research study aims to check the results of Blackhole assault in
MANET using different MAC protocols, i.e.Time division multiple access TDMA and IEEE 802.11b with AODV routing protocol. Relative
examination of Black Hole assault for the two protocols is considered.The impression of Blackhole assault proceeding the concert of MANET is
estimated discovery that protocol is extra liable for the attack and what kind of is the impression of assault for each protocol. The estimations had
been kept in the mildnessfor delay, packet loss, throughput, and network load.
Objectives of the study:
1. To study attention to an investigation of black hole attack in MANET and its outcomes.
2. To Evaluting the results of each MAC, routing protocols to investigate that of those 2 kinds of MAC protocols are extra weak to
Blackhole assault.
Methodology/Experimental design:
Research methodology characterizes how the advance work need to be performed within the shape of research activity. The examination
concentrates on investigation of blackhole assault in MANET using two MAC protocols one routing protocol without a mobility model. Different
attacker will be mentioned in the analysis in the same scenario. The network simulator (NS2) is utilized that presents evaluation of Network load,
packet loss rate, delay and throughput in MANET under MAC protocols. AWK scripts will be used to gather the results. MS-EXCEL will be used
to analyze the results. In last conclusions, may be drawn to the idea of the outcomes received from simulation. Network Simulator Two (NS2) is
used for simulation.
Title:Investigating the effects of the black hole attack in MANET under 802.11b and TDMA
Protocols
Introduction:
Mobile Ad-Hoc Networks are independent and restricted remote structures. MANETs involve
physical hubs. They have the abilityofmovinganywhere in network’s range. Hubs are the frameworks or
gadgets i.e. cellphone, PC, private advanced help, MP3 member and individual tablet which is taking an
interest in the system and are compact gadget. These hubs can go about as host/switch or each on the
equivalent time. They can frame subjective topologies relying upon their availability with each other in
the group. These hubs can possibly arrange themselves and on account of their self-plan limit, they can
be sent direly without the need of any foundation.
Safetyof MANET is the maximum crucial problem for the primary capability of the system. The
classification of system services and honesty of the information can be accomplished by guaranteeing
that safety troubles were met. MANETs regularly be afflicted by safety assaults due to its capabilities
similar unlocked way, ever-altering its physical way progressively, the absence of focal management
and observing, agreeable calculations and no reasonable protection instrument. These elements have
changed the war area scenario for the MANETs in opposition to the safety risks.
The MANETs work while decentralized a brought together the organization where the hubs
speak with one another on the premise of common trust. This feature makes MANETs extra liable and
an attacker exploits within the network. Remote connections likewise buildthe MANETs additional
helpless to assaults that createsMANETsimpler for the assailant to go inside the system and access the
continuous correspondence. Portable hubs show inside the scope of remote connection can catch and
even take part in the system.
MANETs should have a comfortable path for propagation & verbal exchange. It can be a very
difficult and essential trouble so it expands dangers of assault on the Mobile Networks. For creating safe
correspondence and propagation, the researchers ought to know multiple styles of assaults with
outcomes on the MANETs. A MANET network can suffer from flooding attack, wormhole attack, sybil
attack, blackhole assault and denial of service (DoS). These are some type of attacks. A MANET is
extra and limited resources.
Another big problem of MANET is that the MANET uses one common channel accessing for all
nodes. Attacker can take advantages from single channel accessing and can easily hack the data of
mobile nodes. Because MANET is decentralized and every node is master node in MANET. When any
attacker comes to attack MANET it shows itself as member of MANET and hack all data of MANET.
As we mentioned above about different types of attacks. These all use some technique to hack the
system. In the present study, we observe the effect of blackhole attacker in MANET using two different
types of MAC for channel accessing.
Blackhole is a full of life, attack technique wherever aggressor device advances itself as the best
device way to achieve the goal and every single other device. During this assault, the aggressor device
holds up until the point when neighboring devices provoke the route request packet. At the point when
the assailant device gets the demand, it sends a fake message with another grouping number.
This research study aims to check the results of Blackhole assault in MANET using different MAC
protocols, i.e. Time division multiple access TDMA and IEEE 802.11b with AODV routing protocol.
Relative examination of MANET with Blackhole assault is considered under two MAC
protocols. The impact of the Blackhole assault on the execution of MANET is assessed discovering out
which protocol is extra prone to the assault and what form of is the effect of the assault upon each
protocol. The estimations had been lookingfor throughput, delay, packet loss and network load.
Simulation is executed in Network Simulator Two (NS2).
Objectives of the study:
1. The study attention to an investigation of blackhole attack in MANET and its outcomes.
2. Studying the impacts of ablackhole attack of QoS metrics as Normalized Network load, Average
throughput, packet loss rate and delay in MANET.
3. TDMA and IEEE 802.11b MAC protocols with AODV routing protocol are simulated for the
blackhole attacker.
4. Gauging the results of each MAC, routing protocols to investigate that of those 2 kinds of MAC
protocols are extra weak to Blackhole assault.
Literature Review:
MANET is especially prevalent because of the way that these systems are dynamic, foundation
less and versatile. Regardless of the reality of the notoriety of MANET, these systems are especially
presented to assaults [1, 2]. Remote connections likewise createthe MANET high helpless to assaults
that makesMANET is less demanding for the assailant to try in the system thenapproachesthe
progressing correspondence [3]. Various types of assaults broke down in the MANET and their effect
on the system. The assault, for example, greyhole, where the aggressor hub acts malevolently for the
time until the point that the bundles are dropped and afterward change to their ordinary conduct.
MANETs directing conventions are likewise being abused by the assailants through flooding assault,
which is finished by the aggressor either by utilizing RREQ or information flooding [4].
Within one framework, source device wants to send data at the soonest opportunity in an ensured
and speedy way, various attackers elevate themselves having a short and more information exchange
limit offered for sending, for instance, in wormhole strike, and the assailant grows themselves in the
strong key region in the framework. Researchers require usage of their region, i.e. those possessingmost
restricted route among center points [5]. A standout amongst the most emerging problems of MANET is
the constrained battery, assailants yields favorable position of this blemish and goes to save the hubs
conscious till the point when all its vitality is vanished and the hub run into the changeless rest [6].
Numerous different assaults MANET, for example, jellyfish assault, adjustment assault, misrouting
assault and R-Counteroverheadhas been considered & uncovered [7, 8].In black-hole assault, a
pernicious hub utilizes its steering convention in the event that you need to offer it itself for having the
briefest way to the get-away spot hub or to the bundle it needs to catch. This ill-disposed hub publicizes
its accessibility of shimmering courses, regardless of checking its steering work area. Along these lines
aggressor hubs, will consistently have the accessibility in answering to the course, ask for and in this
manner, catch the data bundle and keep up it [9, 10].
Blackhole is the highest safety hazard where the flow of data sends to such a node that without a
doubt does no longer occur in the network. The authors conductedthechallenges of protection risks in
MANET with answer finding approach [11]. Here they use the AODV and the use of the changed
protocol, they could stumble on the Black hollow attack in MANETs. They had anticipated a possible
answer for the black hole attacks that can be carried out on the changed AODV protocol.
These Anticipated strategies could be depleted to explore the safe paths and avoid the blackhole
nodes within the MANET. Save their community when some of malicious nodes attack network at equal
time.
Researchers elaborated the precise styles of assaults and their intensity in advert hoc community.
They had broken down the conduct and disturbing situations of safety dangers in VANET with the
arrangement locating method [12]. They broke down that Blackhole assault with 4 distinct situations
with recognize to the analysis, metrics of delay, throughput and community load. In a network, it is vital
for any protocol to be terminated and well-organizedbyperiod of security. They had analyzed the
susceptibilityof protocolsAODV and OLSR have greater extreme effect while there's better huge variety
of devices, then extrapathneeds.Based on their studies and assessment of simulation forestall cease end
result, they drawn the belief that AODV come to be extra liable to Black Hole assault than OLSR.
Methodology:
Research methodology characterizes how the advance work need to be performed within the
shape of research activity. Research strategy can be comprehending as an instrument that is utilized to
examine some range, for which information is gathered, broke down and on the premise of the
investigation conclusions are drawn. This hasthe a look at method closer to the thesis is quantitative.
This approach begins with the aid of reading the delightedrelated work unique tothesafetyproblem
within MANETs. Literature evaluate is observed with the aid of simulation modeling. The technique of
this take a look at is primarily based on to get the first-class consequences within the designated time
and acquire information incomprehensible/that means full form.The study attention on examination of
blackhole attack in MANET using two MAC protocols one routing protocol without a mobility model.
Different attacker ismentionedrelated toevaluationin the same scenario. NS2 provides different scenarios
for network. Some scripted languages (i.e AWK and Perl) provide the calculation method to analysis of
QoS metrics like Network load, packet loss rate end-to-end delay and throughput in MANET under
MAC protocols.Through scripts results will be gathered. MS-EXCEL will be used to analyze the results.
In last conclusions, could be extracted onto the premise of the effects received from simulation.
Literature cited:
[1] P.V.Jani, “Security within Ad-Hoc Networks,” Position Paper, PAMPAS Workshop, Sept. 16/17
2002.
[2] S. Lu, L. Li, K.Y. Lam, L. Jia, “SAODV: A MANET Routing Protocol that can Withstand Black
Hole Attack.,” International Conference on Computational Intelligence and Security, 2009.
[3] K. Biswas and Md. Liaqat Ali, “Security threats in Mobile Ad-Hoc Network”, Master Thesis,
Blekinge Institute of Technology” Sweden, 22nd March 2007.
[4] M.T.Refaei, V.Srivastava, L.Dasilva, M.Eltoweissy, “A Reputation-Based Mechanism for Isolating
Selfish nodes in Ad-Hoc Networks,” Second Annual International Conference on Mobile and
Ubiquitous Systems, Networking and Services, pp.3-11, July, 2005.
[5] Vij, Akansha, and Vishnu Sharma. "Security issues in mobile adhoc network: A survey
paper." Computing, Communication and Automation (ICCCA), 2016 International Conference on.
IEEE, 2016.
[6] Kumar, Vimal, and Rakesh Kumar. "Prevention of blackhole attack using certificateless signature
(CLS) scheme in MANET." Security Solutions for Hyperconnectivity and the Internet of Things 130
(2016).
[7] C.Wei, L.Xiang, B.yuebin and G.Xiaopeng, “A New Solution for Resisting Gray Hole Attack in
Mobile Ad-Hoc Networks,” Second International Conference on Communications and Networking in
china, pp.366-370, Aug, 2007.
[8] Khamayseh, Yaser M., Shadi A. Aljawarneh, and Alaa Ebrahim Asaad. "Ensuring Survivability
against Black Hole Attacks in MANETS for Preserving Energy Efficiency." Sustainable Computing:
Informatics and Systems (2017).
[9] Kolade, Ayanwuyi T., et al. "Performance analysis of black hole attack in MANET." Proceedings of
the 11th International Conference on Ubiquitous Information Management and Communication. ACM,
2017.
[10] G. A. Pegueno and J. R. Rivera, “Extension to MAC 802.11 for performance Improvement in
MANET”, Karlstads University, Sweden, December 2006.
[11] Kolade, Ayanwuyi T., et al. "Performance analysis of black hole attack in MANET." Proceedings
of the 11th International Conference on Ubiquitous Information Management and Communication.
ACM, 2017.
[12] Bibhu, Vimal, et al. "Performance analysis of black hole attack in VANET." International Journal
Of Computer Network and Information Security 4.11 (2012): 47.
Black hole Attacker

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Black hole Attacker

  • 1. Name of student: Muhammad Saleh Bhutto Department:Information Technology Centre Title: Investigating the effects of black hole attack in MANET under 802.11b and TDMA Protocols Rationale/Problem Statement: Wireless networks are unit fast quality to its top nowadays, because subscribers need a WiFi network independent of their physical role. It may be growing chance of attacks on the Mobile Ad-hoc Networks (MANET). A black hole is one of the security dangers within that movement data is diverted to such a hub, to the point that truly doesn't exist within the network. It's a similarity to the blackhole within the universe in which things vanish. The hub gives itself in such a route to the hub that it may assault different hubs and systems, realizing that it has the most limited way. MANETs need a protected route for transmission and correspondence which is very testing and indispensable problem. Keeping in mind the end goal to give secure correspondence and transmission, scientist worked particularly on the security issues in MANETs, and several safe protocols for safe route inside the networkhad been suggested.Already the works finished on protection problems in MANET depended mostly on routing protocol like Ad-Hoc On Demand Distance Vector (AODV), Distance-Sequence Distance-Vector (DSDV) Dynamic Source Routing (DSR) and Optimized Link State Routing Protocol (OLSR). Various types of assaults were examined, and their outcomes were elaborated through the usage of putting forward how those attacks upset the execution of MANET. This research study aims to check the results of Blackhole assault in MANET using different MAC protocols, i.e.Time division multiple access TDMA and IEEE 802.11b with AODV routing protocol. Relative examination of Black Hole assault for the two protocols is considered.The impression of Blackhole assault proceeding the concert of MANET is estimated discovery that protocol is extra liable for the attack and what kind of is the impression of assault for each protocol. The estimations had been kept in the mildnessfor delay, packet loss, throughput, and network load. Objectives of the study: 1. To study attention to an investigation of black hole attack in MANET and its outcomes. 2. To Evaluting the results of each MAC, routing protocols to investigate that of those 2 kinds of MAC protocols are extra weak to Blackhole assault. Methodology/Experimental design: Research methodology characterizes how the advance work need to be performed within the shape of research activity. The examination concentrates on investigation of blackhole assault in MANET using two MAC protocols one routing protocol without a mobility model. Different attacker will be mentioned in the analysis in the same scenario. The network simulator (NS2) is utilized that presents evaluation of Network load, packet loss rate, delay and throughput in MANET under MAC protocols. AWK scripts will be used to gather the results. MS-EXCEL will be used to analyze the results. In last conclusions, may be drawn to the idea of the outcomes received from simulation. Network Simulator Two (NS2) is used for simulation. Title:Investigating the effects of the black hole attack in MANET under 802.11b and TDMA Protocols Introduction: Mobile Ad-Hoc Networks are independent and restricted remote structures. MANETs involve physical hubs. They have the abilityofmovinganywhere in network’s range. Hubs are the frameworks or gadgets i.e. cellphone, PC, private advanced help, MP3 member and individual tablet which is taking an interest in the system and are compact gadget. These hubs can go about as host/switch or each on the equivalent time. They can frame subjective topologies relying upon their availability with each other in the group. These hubs can possibly arrange themselves and on account of their self-plan limit, they can be sent direly without the need of any foundation. Safetyof MANET is the maximum crucial problem for the primary capability of the system. The classification of system services and honesty of the information can be accomplished by guaranteeing that safety troubles were met. MANETs regularly be afflicted by safety assaults due to its capabilities similar unlocked way, ever-altering its physical way progressively, the absence of focal management and observing, agreeable calculations and no reasonable protection instrument. These elements have changed the war area scenario for the MANETs in opposition to the safety risks. The MANETs work while decentralized a brought together the organization where the hubs speak with one another on the premise of common trust. This feature makes MANETs extra liable and an attacker exploits within the network. Remote connections likewise buildthe MANETs additional helpless to assaults that createsMANETsimpler for the assailant to go inside the system and access the continuous correspondence. Portable hubs show inside the scope of remote connection can catch and even take part in the system. MANETs should have a comfortable path for propagation & verbal exchange. It can be a very difficult and essential trouble so it expands dangers of assault on the Mobile Networks. For creating safe correspondence and propagation, the researchers ought to know multiple styles of assaults with
  • 2. outcomes on the MANETs. A MANET network can suffer from flooding attack, wormhole attack, sybil attack, blackhole assault and denial of service (DoS). These are some type of attacks. A MANET is extra and limited resources. Another big problem of MANET is that the MANET uses one common channel accessing for all nodes. Attacker can take advantages from single channel accessing and can easily hack the data of mobile nodes. Because MANET is decentralized and every node is master node in MANET. When any attacker comes to attack MANET it shows itself as member of MANET and hack all data of MANET. As we mentioned above about different types of attacks. These all use some technique to hack the system. In the present study, we observe the effect of blackhole attacker in MANET using two different types of MAC for channel accessing. Blackhole is a full of life, attack technique wherever aggressor device advances itself as the best device way to achieve the goal and every single other device. During this assault, the aggressor device holds up until the point when neighboring devices provoke the route request packet. At the point when the assailant device gets the demand, it sends a fake message with another grouping number. This research study aims to check the results of Blackhole assault in MANET using different MAC protocols, i.e. Time division multiple access TDMA and IEEE 802.11b with AODV routing protocol. Relative examination of MANET with Blackhole assault is considered under two MAC protocols. The impact of the Blackhole assault on the execution of MANET is assessed discovering out which protocol is extra prone to the assault and what form of is the effect of the assault upon each protocol. The estimations had been lookingfor throughput, delay, packet loss and network load. Simulation is executed in Network Simulator Two (NS2). Objectives of the study: 1. The study attention to an investigation of blackhole attack in MANET and its outcomes. 2. Studying the impacts of ablackhole attack of QoS metrics as Normalized Network load, Average throughput, packet loss rate and delay in MANET. 3. TDMA and IEEE 802.11b MAC protocols with AODV routing protocol are simulated for the blackhole attacker. 4. Gauging the results of each MAC, routing protocols to investigate that of those 2 kinds of MAC protocols are extra weak to Blackhole assault. Literature Review: MANET is especially prevalent because of the way that these systems are dynamic, foundation less and versatile. Regardless of the reality of the notoriety of MANET, these systems are especially presented to assaults [1, 2]. Remote connections likewise createthe MANET high helpless to assaults that makesMANET is less demanding for the assailant to try in the system thenapproachesthe progressing correspondence [3]. Various types of assaults broke down in the MANET and their effect on the system. The assault, for example, greyhole, where the aggressor hub acts malevolently for the time until the point that the bundles are dropped and afterward change to their ordinary conduct. MANETs directing conventions are likewise being abused by the assailants through flooding assault, which is finished by the aggressor either by utilizing RREQ or information flooding [4]. Within one framework, source device wants to send data at the soonest opportunity in an ensured and speedy way, various attackers elevate themselves having a short and more information exchange limit offered for sending, for instance, in wormhole strike, and the assailant grows themselves in the strong key region in the framework. Researchers require usage of their region, i.e. those possessingmost restricted route among center points [5]. A standout amongst the most emerging problems of MANET is the constrained battery, assailants yields favorable position of this blemish and goes to save the hubs conscious till the point when all its vitality is vanished and the hub run into the changeless rest [6]. Numerous different assaults MANET, for example, jellyfish assault, adjustment assault, misrouting assault and R-Counteroverheadhas been considered & uncovered [7, 8].In black-hole assault, a
  • 3. pernicious hub utilizes its steering convention in the event that you need to offer it itself for having the briefest way to the get-away spot hub or to the bundle it needs to catch. This ill-disposed hub publicizes its accessibility of shimmering courses, regardless of checking its steering work area. Along these lines aggressor hubs, will consistently have the accessibility in answering to the course, ask for and in this manner, catch the data bundle and keep up it [9, 10]. Blackhole is the highest safety hazard where the flow of data sends to such a node that without a doubt does no longer occur in the network. The authors conductedthechallenges of protection risks in MANET with answer finding approach [11]. Here they use the AODV and the use of the changed protocol, they could stumble on the Black hollow attack in MANETs. They had anticipated a possible answer for the black hole attacks that can be carried out on the changed AODV protocol. These Anticipated strategies could be depleted to explore the safe paths and avoid the blackhole nodes within the MANET. Save their community when some of malicious nodes attack network at equal time. Researchers elaborated the precise styles of assaults and their intensity in advert hoc community. They had broken down the conduct and disturbing situations of safety dangers in VANET with the arrangement locating method [12]. They broke down that Blackhole assault with 4 distinct situations with recognize to the analysis, metrics of delay, throughput and community load. In a network, it is vital for any protocol to be terminated and well-organizedbyperiod of security. They had analyzed the susceptibilityof protocolsAODV and OLSR have greater extreme effect while there's better huge variety of devices, then extrapathneeds.Based on their studies and assessment of simulation forestall cease end result, they drawn the belief that AODV come to be extra liable to Black Hole assault than OLSR. Methodology: Research methodology characterizes how the advance work need to be performed within the shape of research activity. Research strategy can be comprehending as an instrument that is utilized to examine some range, for which information is gathered, broke down and on the premise of the investigation conclusions are drawn. This hasthe a look at method closer to the thesis is quantitative. This approach begins with the aid of reading the delightedrelated work unique tothesafetyproblem within MANETs. Literature evaluate is observed with the aid of simulation modeling. The technique of this take a look at is primarily based on to get the first-class consequences within the designated time and acquire information incomprehensible/that means full form.The study attention on examination of blackhole attack in MANET using two MAC protocols one routing protocol without a mobility model. Different attacker ismentionedrelated toevaluationin the same scenario. NS2 provides different scenarios for network. Some scripted languages (i.e AWK and Perl) provide the calculation method to analysis of QoS metrics like Network load, packet loss rate end-to-end delay and throughput in MANET under MAC protocols.Through scripts results will be gathered. MS-EXCEL will be used to analyze the results. In last conclusions, could be extracted onto the premise of the effects received from simulation. Literature cited: [1] P.V.Jani, “Security within Ad-Hoc Networks,” Position Paper, PAMPAS Workshop, Sept. 16/17 2002. [2] S. Lu, L. Li, K.Y. Lam, L. Jia, “SAODV: A MANET Routing Protocol that can Withstand Black Hole Attack.,” International Conference on Computational Intelligence and Security, 2009. [3] K. Biswas and Md. Liaqat Ali, “Security threats in Mobile Ad-Hoc Network”, Master Thesis, Blekinge Institute of Technology” Sweden, 22nd March 2007. [4] M.T.Refaei, V.Srivastava, L.Dasilva, M.Eltoweissy, “A Reputation-Based Mechanism for Isolating Selfish nodes in Ad-Hoc Networks,” Second Annual International Conference on Mobile and Ubiquitous Systems, Networking and Services, pp.3-11, July, 2005. [5] Vij, Akansha, and Vishnu Sharma. "Security issues in mobile adhoc network: A survey paper." Computing, Communication and Automation (ICCCA), 2016 International Conference on. IEEE, 2016.
  • 4. [6] Kumar, Vimal, and Rakesh Kumar. "Prevention of blackhole attack using certificateless signature (CLS) scheme in MANET." Security Solutions for Hyperconnectivity and the Internet of Things 130 (2016). [7] C.Wei, L.Xiang, B.yuebin and G.Xiaopeng, “A New Solution for Resisting Gray Hole Attack in Mobile Ad-Hoc Networks,” Second International Conference on Communications and Networking in china, pp.366-370, Aug, 2007. [8] Khamayseh, Yaser M., Shadi A. Aljawarneh, and Alaa Ebrahim Asaad. "Ensuring Survivability against Black Hole Attacks in MANETS for Preserving Energy Efficiency." Sustainable Computing: Informatics and Systems (2017). [9] Kolade, Ayanwuyi T., et al. "Performance analysis of black hole attack in MANET." Proceedings of the 11th International Conference on Ubiquitous Information Management and Communication. ACM, 2017. [10] G. A. Pegueno and J. R. Rivera, “Extension to MAC 802.11 for performance Improvement in MANET”, Karlstads University, Sweden, December 2006. [11] Kolade, Ayanwuyi T., et al. "Performance analysis of black hole attack in MANET." Proceedings of the 11th International Conference on Ubiquitous Information Management and Communication. ACM, 2017. [12] Bibhu, Vimal, et al. "Performance analysis of black hole attack in VANET." International Journal Of Computer Network and Information Security 4.11 (2012): 47.