Module 2 - 5th

Various modes for Block Ciphers are

• ECB

• CBC

• OFB

• CTR

In which mode of operation, each block of plaintext is XORed with the previously encrypted block

• Cipher Block Chaining

• Electronic Code Book

• Counter Mode

• Output Feedback

Nonce is used to produce key stream in ............ mode.

• Electronic Code Book

• Cipher Block Chaining

• Counter Mode

• None of the abov

....... is used to verify whether the message has been modified by unauthorized entity

• ECB

• MAC

• Hash

• None of the above

Different keys are used for encryption and decryption in........... cryptography.

• Symmetric

• Asymmetric

• Both Symmetric and Asymmetric

• Hash functions

____ key is used for encryption in Asymmetric

• Public

• Private

• Public and Private

• No key is used

..... key is freely available and published by the ........ key owner

• Private, Public

• Public, Public

• Public, Private

• Private, Public

Symmetric Key Encryption is faster than Asymmetric Encryption

• True

• False