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MIT4022
SPRING
2016
1 List and
explain the types of Security Attacks in Network.
Answer: When you test any computer
system, one of your jobs is to imagine how the system could malfunction. Then,
you improve the system's design so that the system can withstand any of the
problems you have identified. In the same way, we analyze a system from a security
perspective,
2 Explain
Feistel Cipher.
Answer: Feistel Cipher is not a
specific scheme of block cipher. It is a design model from which many different
block ciphers are derived. DES is just one example of a Feistel Cipher. A
cryptographic system based on Feistel cipher structure uses the same algorithm
for both encryption
3 Explain the
following.
(a) Asymmetric
Keys
(b) Public Key
Certificate
(c) Public Key
(Asymmetric) Cryptographic Algorithm
(d) Public Key
Infrastructure (PKI)
Answer: a) Asymmetric cryptography
or public-key cryptography is cryptography in which a pair of keys
4 (a) Explain
digital signature
(b) Explain the
different types of attacks on digital signatures.
Answer: a) A digital signature is a
mathematical scheme for demonstrating the authenticity of a digital message or
documents. A valid digital signature gives a recipient reason to believe that
the message was created by a known sender, that the sender cannot deny having
sent the message (
5 Explain the
benefits of IP security.
Answer: Internet Protocol Security
(IPSec) is a framework of open standards for ensuring private, secure
communications over Internet Protocol (IP) networks, through the use of
cryptographic security services. IPSec is a suite of cryptography-based
protection services and security protocols
6 Define the
following terms used in the IEEE 802.11 standard.
(a) Access Point
(AP)
(b) Basic
Service Set (BSS)
(c) Coordination
function
(d) Distribution
System (DS)
(e) Extended
Service Set (ESS)
Answer: a) Inter-Access Point
Protocol is a recommendation that describes an optional extension to IEEE
802.11 that provides wireless access point communications among multivendor
systems.[1] 802.11 is a set of IEEE standards that govern wireless networking
transmission methods. They are commonly used today in their 802.11a, 802.11b,
802.11g and 802.11n versions to provide wireless connectivity in the home,
office and some commercial
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