UNIT5

Which process needs the key? (51)

• A. encryption

• B. decryption

• C. recovering the original information

• A&B are correct

What types of attacks are mentioned in the text? (41)

• Brute force attack

• Ciphertext-only attack

• Known - plaintext attack

• All above are correct

………….. is to adequately address confidentiality, data integrity, authentication, and non-repudiation in both theory and practice. (51)

• fundamental goal of cryptography

• general object of cryptography

• basic goal of cryptology

• general object of cryptanalysis

…………. is a service which prevents an entity from denying previous commitments or actions. (51)

• Non-repudiation

• Authentication

• Data integrity

• Confidentiality

What was considered an early instance of encipherment? (51)

• Rosetta Stone

• Egyptian hieroglyphics

• Scytale

• A code book

A service related to verification. This function is for both parties and information itself is …………….. (51)

• data integrity

• non-repudiation

• authentication

• confidentiality

Which of the following attacks that can, in theory, be used to attempt to decrypt any encrypted data? (51)

• A. A brute-force attack

• B. dictionary attacK

• C. Man-in the middle attack

• A&B are correct

Which of the followings is the study of analyzing information systems in order to study the hidden aspects of the systems? (51)

• A. Cryptography

• B. Cryptology

• C. Cryptanalysis

• A&B are correct

Who invented one-time pad encryption for Telex Traffic? (52)

• Hugo Alexander Koch

• Gilbert S. Vernam

• Dr. Horst Feistel

• Charles Babbage

What cipher did Julius Caesar use to secure military and government communications? (52)

• A. Monoalphabetic substitution cipher

• B. A simple substitution cipher

• C. Tranposition cipher

• A & B are incorrect