2. Taking Steps Towards a
Wireless World
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3. What is a Wireless Network?
A group of
connected devices
that communicate
through the air by
means of
electromagnetic
waves, such as radio
waves.
4. Types of Wireless Networks
WPAN’s dynamically connect devices within a
relatively small area; maintain random
network configurations.
i.e. Bluetooth, ad-hoc networks
WLAN’s connect devices over a more broad
area, known as a cell. Can be found in our
homes, libraries, and coffee shops.
i.e. Wi-Fi, laser bridges
5. Types of Wireless Networks
WMAN’s are the connection of multiple
WLAN’s and may span an entire city or
college campus.
i.e. WiMAX
Mobile device networks which are
used by our cell phones.
i.e. GSM (2G), 3G cellular networks
7. What is RFID?
By means of a
simple integrated
circuit and an
antenna, RFID tags
can quickly and
reliably identify
nearly anything
when scanned with
an RFID reader.
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QuickTime™ and a
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QuickTime™ and a
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8. Radio Frequency Identification
Three types:
1. Passive does not have a
power supply.
2. Active has a power
supply that powers the
transmission.
3. Semi-passive has a
power supply that
powers the chip, but not
the transmission.
QuickTim e™ and a
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are needed to see this picture.
QuickTime™ and a
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9. Our Responsibility
We must
understand and
adequately address
the inherent
security risks
involved with
wireless
networking.
Physical theft
1. Be aware of your
surroundings.
2. Secure your devices
when they are not
in use.
Wireless medium
11. Types of unauthorized access :
-Accidental
association
-Malicious
association
-Ad-hoc networks
-Non-traditional
networks
12. Types of unauthorized access :
-Identity theft
(MAC spoofing)
-Man-in-the-
middle attacks
- Denial of service
-Network
injection
- Café Latte
attack
13. Counteracting security risks
All wireless LAN
devices need to be
secured
All users of the
wireless network need
to be educated in
wireless network
security
All wireless networks
need to be actively
monitored for
weaknesses and
breaches
14. There are some very good cryptographic tools that
can be used to protect digital resources.
Many of these tools have proven security
The problem is usually bad implementations
The best cryptographic security is point-to-point
security (such as VPN)
The source & destination
― are mutually authenticated (with public key cryptography)
― exchange privately a fresh secret key (with public key cryptography)
― use symmetric key encryption scheme to encrypt exchanged data
(with symmetric key cryptography
15. Point-to-point security
― Authentication usually involves certificates (a trusted third party
certifies the public key of the entities) and a cryptographic handshake.
― WIMAX uses the Extensible Authentication Protocol for this purpose.
― For encryption it uses block ciphers such as DES3 or AES
This offers protection at the protocol layer
― There are still problems at the physical layer, such as jamming attacks
(Denial-of-Service), or flooding attacks
Security vs. functionality tradeoff
― Rule of thumb: the more security the less functionality …
