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PROGRAM -
Master of Science in Information Technology(MSc IT)Revised Fall 2011
SEMESTER
- 4
SUBJECT
CODE & NAME - MIT4022- Network
Security
CREDIT
- 4
BK ID -
B2069
MAX.
MARKS - 60
Q1.
Explain Caesar’s Cipher encryption technique. 10
Ans:
Caesar Cipher:
It is one of the simplest and most widely known encryption techniques proposed
by Julius Caesar. It is a type of substitution cypher which involves replacing
each letter of the alphabet with the
letter
Q2.
Explain data encryption standard (DES). 10
Ans:
Data Encryption Standard (DES): Data Encryption Standard (DES) was the main
encryption scheme that was used until recently. National Bureau of Standards
now called the National Institute of Standards and Technology (NIST) adopted
this standard. Since DES is now considered to be insecure for many
Q3.
Describe the principles of Public-Key Cryptosystems. 10
Ans:
Principles of Public-Key Cryptosystems: Public-key cryptography needs two
keys. One key to encrypt a message and this is "public", so anyone
can use it. The other key is to decrypt (or decode) the message. This
Q4.
Write short notes on a) Digital signature b) Attacks on digital signature. 4, 6
Ans:
Digital Signatures:
A digital signature is an authentication mechanism that enables the creator of
a message to attach a code that acts as a signature. In other words, a digital
signature is an electronic form of a signature that can be used to authenticate
the identity of the sender of a message or the signer of a document, and also
ensure that the original content of the message or document that has been sent
is unchanged.
Q5.
Describe Kerberos. 10
Ans:
Kerberos:
Kerberos is an authentication service developed at MIT (Massachusetts Institute
of Technology) that uses symmetric key encryption techniques and a key
distribution centre. Kerberos uses a
private key cryptosystem to protect the information from disclosure and
modification. Kerberos performs
Q6.
Explain Security Socket Layer (SSL). 10
Ans: Security Socket Layer
(SSL): SSL is a security protocol that was developed by Netscape Communications
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