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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
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 Encryption Standard (DES) specifies an algorithm to be
implemented in electronic hardware devices and used for the cryptographic
protection of computer data ... Encrypting data converts it to an
unintelligible form called cipher. Decrypting cipher converts the data back to
its original
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
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 understand how this
transaction is handled in the conventional, paper
5 Explain IP security
policy.
Answer: The security policy determines the security services afforded to a
packet. As mentioned earlier, all IPSec implementations store the policy in a
database called the SPD. The database is indexed by selectors and contains the information
on the security services offered to an IP packet. The
6 Write a note on Wireless
Transport Layer Security (WTLS).
Answer: The Transport Layer Security protocol is the IETF standard version of
the SSL protocol. The two are very similar, with slight differences. The main
difference being TLS does not support Fortezza type in both the key exchange
and the encryption/decryption algorithms. The generation of
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