Assignment6

What is the process of converting plaintext into ciphertext called?

• Encryption

• Decryption

• Authentication

• Authorization

Which of the following are encryption methods ?

• BitStream

• Block Cipher

• Both of them

What is the main difference between a stream cipher and a block cipher?

• Stream ciphers encrypt data in blocks while block ciphers encrypt data one bit at a time.

• Stream ciphers encrypt data one bit at a time while block ciphers encrypt data in blocks.

• Stream ciphers are faster than block ciphers.

• Block ciphers are faster than stream ciphers.

----------- algorithms are used to secure our digital communication and transactions.

• cryptographic

• Cryptic

• Cryptographer

• Cryptanalysis

Block ciphers are generally more secure than bit stream ciphers ?

• True

• False

Bitstream ciphers are slower and less efficient ?

• True

• False

Answer explanation

Block ciphers is the correct one.

Bitstream ciphers are generally faster and more efficient ?

• True

• False

Block Ciphers are also lesssecure ?

• True

• Fales

Answer explanation

Correct is bit stream

In which method we replace each letter with another letter or symbol ?

• Substitution Cipher

• The Vigenère Square

------ used in the Vigenère cipher to encrypt and decrypt messages ?

• Substitution Cipher

• The Vigenère Square