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PROGRAM
BSc
IT
SEMESTER
FIFTH
SUBJECT
CODE & NAME
BT0088
– Cryptography and Network Security
1 Explain Caesar’s Cipher
encryption technique.
Answer: Caesar’s
Cipher encryption technique
The Caesar cipher has an important place
in history. Julius Caesar is said to have been the first to use this scheme, in
which each letter is translated to a letter a fixed number of places after it
in the alphabet. Caesar used a shift of 3, so that plaintext letter pi was
enciphered as ciphertext letter ci by the rule
2 Explain data encryption
standard (DES).
Answer: The most widely used encryption scheme
is based on Data Encryption standard. Data Encryption Standard (DES), a system
developed for the U.S. government, was intended for use by the general public.
It has been officially accepted as a cryptographic standard both in the United
States and abroad. Moreover, many hardware and software systems have been designed
with the DES. The Data
3 Describe the principles
of Public-Key Cryptosystems.
Answer: The cryptosystem contains a set of
rules to encrypt the plaintext and to decrypt the ciphertext. The rule used for
encryption and decryption are called algorithms, often uses a device called a
key, denoted by K. The ciphertext depends on the original plaintext message,
the algorithm, and the key value. So
4 Write short notes on the
following:
a) Digital signature
b) Attacks on digital
signature
Answer: Another typical situation parallels a common human need: an order to transfer
funds from one person to another. In other words, we want to be able to send electronically
the equivalent of a computerized check. We
5.
Write short notes on Packet Filtering Gateway.
Answer:
Firewalls protect
a Network of Computers from being Compromised, Denial of Service and other
Attacks from Hackers trying to Intrude the network from outside. A Firewall can
be in the form of a Hardware or a Software on a
6.
Write short notes on Risk Analysis.
Answer:
Risk analysis can be defined in many
different ways, and much of the definition depends on how risk analysis relates
to other concepts. Risk analysis can be "broadly defined to include risk
assessment, risk characterization,
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