Unit 4

Unit IV
IOT PROTOCOLS & SECURITY
Syllabus:
Protocol Standardization for IoT, Efforts, M2M and WSN
Protocols, SCADA and RFID Protocols, Issues with IoT
Standardization, Unified Data Standards, Protocols – IEEE
802.15.4, BACNet Protocol, Modbus, KNX, Zigbee
Architecture, Network layer, APS layer.
IoT Security: Vulnerabilities of IoT, Security Requirements,
Challenges for Secure IoT, Threat Modeling, Key elements
of IoT Security: Identity establishment, Access control, Data
and message security, Non-repudiation and availability,
Security model for IoT.

IoT Protocol Standardization
 Some of the IoT projects such as the Internet of Things Strategic
Research Roadmap by CERP-IoT are still at the grand concept
level with limited materialized results.
 The IoT-A (Internet of Things Architecture) is one of the few
efforts targeting a holistic architecture for all IoT sectors. This
consortium consists of 17 European organizations from nine
countries.
 They summarized the current status of IoT standardization as
follows:
 Fragmented architectures, no coherent unifying concepts, solutions
exist only for application silos.
 No holistic approach to implement the IoT has yet been proposed.
 Many island solutions do exist (RFID, sensor nets, etc.).
 Little cross-sector reuse of technology and exchange of knowledge.

Working groups of IoT standards.
SCOE / COMP/ ESIOT/ MPW

Issues with IoT Standardization
•It should be noted that not everything about
standardization is positive
• Standardization is like a double-edged sword:
Critical to market development
But it may threaten innovation and inhibit
change when standards are accepted by the market
• Standardization and innovation are like yin & yang
• They could be contradictory to each other in some
cases, even though this observation is debatable

•Some people believe that the IoT concept is well
established
• However, some gray zones remain in the definition,
especially which technology should be included
• Following two issues for IoT standardization in
particular and ICT standardization in general may never
have answers:
1. ICT standardization is a highly decentralized activity.
How can the individual activities of the network of
extremely heterogeneous standards setting bodies be
coordinated?
2. It will become essential to allow all interested
stakeholders to participate in the standardization
process toward the IoT and to voice their respective
requirements and concerns. How can this be achieved?

Unified Data Standards
• Already discussed about two pillars of the
Internet
• HTML/HTTP combination of data format and
exchange protocol is the foundation pillar of
WWW
• Described great number of data standards and
protocols proposed for four pillar domains of IoT
• Many issues still impede the development of IoT
and especially WoT vision

• Before IoT, Internet was actually an Internet of
documents or of multimedia documents
• Two pillars of Internet including HTML/HTTP
turned the Internet into WWW
• We need to turn the IoT into the WoT.
•There are many different levels of protocols, but
the ones that most directly relate to business and
social issues are the ones closest to the top, the
so-called application protocols such as HTML /
HTTP for the web

Protocols – IEEE 802.15.4
• Defines LR-WPANs
• Specifies physical layer and media access control
for LR-WPANs
• Defined the standard in 2003
• Basic framework conceives a 10m communications
range with a transfer rate of 250 kbit/s

Uses of IEEE 802.15.4:
Suitable for IOT Based applications where
multiple sensors nodes are working.
Highly scalable where large number of nodes
can be deployed together.
Network maintenance is low cost & reliable.

BACNet Protocol
•Communications protocol for Building Automation
and Control (BAC) networks
• Provides mechanisms for computerized building
automation devices to exchange information
• Designed to allow communication of building
automation & control system for application like
• Heating, Ventilating and Air-conditioning Control
(HVAC)
• Lighting Control, Access Control
• Fire Detection Systems and their Associated Equipment

 BACNet Protocol defined by three types of characteristics:
 BACnet objects
 BACnet properties.
 BACNet Services.
1. BACnet objects:
 Logical representation of physical entity.
 Represent many different aspects of a control system.
 Examples are:
• A physical device (device objects)
• A temperature input (analog input)
• A relay control (binary output)
BACNet Protocol

BACnet objects
BACNet Standard Object

2. BACnet properties
• Contains information about an object.
• Every object in BACnet must have at least the following three
properties:
• object_identifier
• object_name
• object_type

3. BACnet Services
• Information exchange between.
• Services are used to perform reads, writes, and I/O.
• The object that provides the service is a server and the object
that requests the service is the client.
• Most objects can be both a server and a client, depending on
the system's needs.
 Some Important Services as:

 BACnet routers:
 A BACnet router transmits BACnet messages between two
BACnet networks.
 The networks can be different (IP to MS/TP) or the same (IP to
IP).
 The router sends appropriate messages between the networks in
both directions.
BACnet networks
 BACnet MS/TP:
 Receive Token.
 Initiate communication (up to the number of Max
Info Frames) as needed.
 Increment the node’s token count, if the token
count equals the Token Count parameter (as
defined above) then initiate the polling for
masters sequence, or pass the token to the next
node.

 Modbus is a serial communications protocol .
 It used with programmable logic controllers.
 Truly open and the most widely used network protocol in the
industrial manufacturing environment.
 The main reasons for the use of Modbus in the industrial
environment are: developed with industrial applications in mind,
openly published and royalty-free, easy to deploy and maintain,
moves raw bits or words without placing many restrictions on
vendors.
 Communication between MODBUS devices: (master-slave
technique)
 Modbus enables communication among many devices connected
to the same network
Modbus

 SERIAL TRANSMISSION MODES OF MODBUS NETWORKS:
• ASCII Mode:
• Each character byte in a message is sent as 2 ASCII characters.
• Allows time intervals of up to a second between characters
during transmission without generating errors.
Modbus

RTU Mode:
•Each 8-bit message byte contains two 4-bit
hexadecimal characters
•The message is transmitted in a continuous
stream.

What is Zigbee?
 Protocol which provides communication for wireless PAN of
resource constrained devices.
 It is developed by Zigbee alliance & IEEE jointly.
 ZigBee aims to provide the upper layers of the protocol stack
(from network to the application layer).
 It just reside on top of the PHY & MAC Sub layers.
 ZigBee, with its sleepy, battery-powered end devices, is a perfect
fit for wireless sensors.
 This communication system is less expensive and simpler
 Feature:
Multi-Hop Routing, Ad-hoc Topology, Stochastic addressing,
Link Management , Frequency Agility , Fragmentation and
Reassembly, Power Management , Security
ZIGBEE

 ZigBee applications:
ZIGBEE

ZigBee Protocol Stack/Architecture

 KNX, also known as Konnex,
 Open international building control standard.
 It is a joint work of three previous standards, European Home
Systems Protocol (EHS), BatiBUS, and the European
Installation Bus (EIB).
 KNX can provide energy savings ,comfort and convenience,
security.
 KNX is a network of microcontrollers
 In a KNX automation system, there is only one software tool for
configuring KNX devices, ETS (Engineering Tool Software).
KNX

• KNX defines several physical communication media:
• Twisted pair wiring (inherited from the BatiBUS and EIB
Instabus standards)
• Powerline networking (inherited from EIB and EHS - similar
to that used by X10)
• Radio (KNX-RF)
• Infrared
• Ethernet (also known as EIBnet/IP or KNXnet/IP)
KNX

 KNX Products:
• The KNX Association member companies have more than
7000 KNX certified product in their catalogues. This wide
range of products allow, for example, the integration of:
• Heating/ventilation & Air Conditioning control
• Shutter/Blind & shading control
• Alarm monitoring
• Energy management & Electricity/Gas/Water metering
• Audio & video distribution
KNX

M2M and WSN Protocols
 M2M application – highly customized
 Vertical industry – developing standards form auto industry to smart
grid
 Horizontal standards – key requirement for M2M to move from its
current state to truly interconnected IoT.
 A horizontal standard is expected to be the major impetus to growth
in the future.
 The International Telecommunication Union’s (ITU) and ETSI’s
(M2M Technical Committee) Global Standards Collaboration (GSC),
which has established the M2M Standardization Task Force (MSTF,
created during the GSC-15).
 It define a conceptual framework for M2M applications that is
vertical industry and communication technology agnostic, and to
specify a service layer that will enable application developers to
create applications that operate transparently across different vertical
domains and communication technologies without the developers
having to write their own complex custom service layer.

M2M and WSN Protocols
 The high-level M2M architecture from MSTF does include fixed
and other noncellular wireless networks, which means it’s a
generic, holistic IoT architecture even though it is called M2M
architecture
 Despite all of the positives, it seems the voices from the SCADA
(supervisory control and data acquisition) and RFID
communities are relatively weak; efforts to incorporate existing
SCADA standards such as OPC, ISA-95, and RFID EPCIS,
ONS, and others are not seen yet. It remains to be seen whether
all of the stakeholders from the four pillars of IoT will be
equally included in the loop.
 3GPP is only one of the SDOs in the MSTF, this makes sense
and good results are much anticipated from MSTF. Some
vertical applications on top of the Unified Horizontal M2M
architecture are already under way

Standardization Bodies in the field of WSNs
There are a number of standardization bodies in the field of WSNs.
 The IEEE focuses on the physical and MAC layers;
 The IETF works on layers 3 and above.
 IEEE 1451 is a set of smart transducer interface standards developed
by the IEEE Instrumentation and Measurement Society’s Sensor
Technology
 Technical Committee that describe a set of open, common, network-
independent communication interfaces for connecting transducers
(sensors or actuators) to microprocessors, instrumentation systems,
and control/field networks.
 One of the key elements of these standards is the definition of
transducer electronic data sheets (TEDS) for each transducer. The
TEDS is a memory device attached to the transducer, which stores
transducer identification, calibration, correction data, and
manufacturer-related information.

The IEEE 1451 family of standards includes:
 1451.0-2007 Common Functions, Communication Protocols, and TEDS
Formats
 451.1-1999 Network Capable Application Processor Information Model
 1451.2-1997 Transducer to Microprocessor Communication Protocols &
TEDS Formats
 1451.3-2003 Digital Communication & TEDS Formats for Distributed
Multi-drop Systems
 1451.4-2004 Mixed-mode Communication Protocols & TEDS Formats
 1451.5-2007 Wireless Communication Protocols & TEDS Formats
 1451.7-2010 Transducers to Radio Frequency Identification (RFID)
Systems Communication Protocols and TEDS Formats
 The goal of the IEEE 1451 family of standards is to allow the access of
transducer data through a common set of interfaces whether the
transducers are connected to systems or networks via a wired or
wireless.

SCADA and RFID Protocols
• The SCADA is one of the IoT pillars to represent the whole
industrial automation arena. Industrial automation has a
variety of vertical markets and there are also many types of
SCADAs.
• IEEE created a standard specification, called Std C37.1™, for
SCADA and automation systems in 2007,

IEEE Std. C37.1 SCADA architecture.
Power SCADA applications

 In recent years, network- based industrial automation, use of
intelligent electronic devices(IEDs),or IoT devices.
 The processing is distributed, and functions that used to be
done at the control center can now be done by the IED, that
is, M2M between devices.
 Despite the fact that many functions can be moved to the
IED, utilities still need a master station, the IoT platform, for
the operation of the power system.
 Due to the restructuring of the electric industry, traditional
vertically integrated electric utilities are replaced by many
entities such as GENCO (Generation Company), TRANSCO
(Transmission Company), DISCO (Distribution Company), ISO
(independent system operator), RTO (regional transmission
organization),
• To fulfil their role, each of these entities needs a control
centre, that is, a substation, to receive and process data and
take appropriate control actions.

 This specification addressed all levels of SCADA systems and
covered the technologies used and, most importantly, the
architecture of how those technologies interact and work
together.
 However, no XML data formats and componentized architecture
details are specified, which is perhaps why SCADA has long
been regarded as a traditional control system market.
 People working in that area are often not aware of Internet-
based IT innovations and cannot relate their work to a new
concept such as IoT.

RFID
38
• The smart cards with contactless interfaces (RFID is a
subset) are becoming increasingly popular for
payment and ticketing applications.
• The RFID protocols and data formats are relatively
well defined, mostly by EPCglobal, and unified
compared with protocols and formats of the other
three pillars of IoT

• The standard for contactless smart cards is ISO/IEC 15693,
which allows communications at distances up to 50 cm

IOT Security
• Fundamental idea - IoT will connect all objects
around us to provide smooth communication
• Economic of scale in IoT presents new security
challenges for global devices in terms of
– Authentication
– Addressing
– Embedded Security

IOT Security
•Devices like RFID and sensor nodes have no access
control functionality
• Can freely obtain or exchange information from
each other
• So authentication & authorization scheme must be
established between these devices to achieve the
security goals for IoT
• Privacy of things and security of data is one of the
key challenges in the IoT

Vulnerabilities of IoT
•Unauthorized Access
– One of the main threats is the tampering of
resources by unauthorized access
– Identity-based verification should be done before
granting the access rights
• Information corruption
– Device credential must be protected from
tampering
– Secure design of access rights, credential and
exchange is required to avoid corruption

• DoS Attack
– Denial of Service (DoS)
– Makes an attempt to prevent authentic user
from accessing services which they are eligible for
– For example, unauthorized user sends to many
requests to server
– That flood the network and deny other authentic
users from access to the network

• DDoS Attack
– Distributed Denial of Service
– Type of DoS attack where multiple compromised
systems are used to target single system causing
DoS
– Compromised systems – usually infected with
Trojan
– Victims of a DDoS attack consist of both
• End targeted systems
• All systems maliciously used and controlled by
the hacker in the distributed attack

IoT Security Tomography
• Classified according to attacks addressing to
different layers
– Transport Layer- sends wrong data and inject incorrect control
packets
– Network Layer- routing loop,wormhole attack and network
partitioning
– MAC layer- spoofing,buffer overflow, eavesdropping and os
level threats.
– RF layer- complete jamming,eavesdropping,hardware/ sensor
level threat

Key Elements of Security
• Authentication
• Access Control
• Data and Message Security
• Non-repudiation and Availability

Authentication
• Secure Entity Identification or Authentication
• Authentication is identity establishment between
communicating devices or entities
• Entity can be a single user, a set of users, an entire
organization or some networking device
• Identity establishment is ensuring that origin of
electronic document & message is correctly identified

Access Control
• Also known as access authorization
• Principles is to determine who should be able to
access what
• Prevents unauthorized use of resources
• To achieve access control, entity which trying to gain
access must be authenticated first
• According to authentication, access rights can be
modified to the individual

Data and Message Security
• Related with source authenticity, modification
detection and confidentiality of data
• Combination of modification & confidentiality of
message is not enough for data integrity
• But origin of authenticity is also important
• Location privacy is equally important risk in IoT
• Should not be any way for attacker to reveal identity
or location information of device

Non-repudiation and Availability
• Non-repudiation is the security services for point-to-
point communications
• Process by which an entity is prevented from
denying a transmitted message
• So when message is sent, receiver can prove that
initiating sender only sent that message
• Sender can prove that receiver got message
• To repudiate means to deny

Non-repudiation and Availability
• Availability is ensured by maintaining all h/w,
repairing immediately whenever require
• Also prevents bottleneck occurrence by keeping
emergence backup power systems
• And guarding against malicious actions like
Denial of Service (DoS) attack

• Security model for IoT represents the security features that should
be followed by an IoT application.
• The security model of IoT can be represented by a cube with three
dimensions representing
1. security – authorization,
2. trust – repudiation and
3. privacy – respondent.
• The intersection defines the specific characteristics of the IoT
security model.
• security of the IoT based application focuses on Authorization,
Identification and Authentication, Confidentiality, Integrity, Non-
repudiation and Availability.
• Privacy focuses on Owner’s privacy, user’s privacy, Ethics of
communication, Laws concerned and accused’s privacy.
• While trust focuses on Beliefs, credentials, delegation
(allocations), recommendation and repudiation.

Challenges for Secure IoT
•Identity Management for IoT devices
•Secure interaction with and within IoT
•Privacy and Distributed access control
•Secure Data Management and Transfer
•End to End security (cryptographic encryption)
•Privacy
•Security Structure

Challenges for Secure IoT
• Identity Management for IoT devices
– IoT device needs a unique identity and identifier
– Provides Trust management and building circle of
trust.
– Useful for authentication mechanisms.
• Secure interaction with and within IoT
– Physical and virtual movement of devices needs to
be managed.
• Privacy and Distributed access control
– Identity of devices should be exchanged
dynamically.
• Secure Data Management and Transfer
– Secure storage management, separate data auditing

Explain lifecycle of an IOT device.

Unit 4

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