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Introduction to Cryptography with Dr. Khalid Javeed

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Introduction to Cryptography with Dr. Khalid Javeed

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Questions and Answers

What are the two basic goals of cryptography?

Message privacy and key generation

Symmetric encryption and digital signatures

Data integrity and message authentication

Data authenticity and data privacy (correct)

Which encryption scheme is also known as public-key encryption?

Symmetric encryption

Message privacy

Message integrity

Asymmetric encryption (correct)

What are the three parts of a block cipher application?

Data privacy, data integrity, and data authenticity

Plaintext, ciphertext, and key

Symmetric keys, asymmetric keys, and MAC

Encryption, key generation, and decryption (correct)

What is the size of a DES block in bits?

56 Signup and view all the answers

Which security goal of cryptography ensures that an adversary should not be able to modify a message?

Message integrity Signup and view all the answers

What is the purpose of a message authentication code (MAC) in cryptography?

To ensure data authenticity of messages Signup and view all the answers

What is the correct viewpoint regarding block ciphers?

Block ciphers are primitives used to construct other cryptographic tools. Signup and view all the answers

What is the common element for achieving confusion in encryption?

Substitution Signup and view all the answers

According to Claude Shannon, what is diffusion in encryption?

Spreading the influence of one plaintext symbol over many ciphertext symbols. Signup and view all the answers

Which encryption algorithm is often used for achieving diffusion?

DES Signup and view all the answers

What did Claude Shannon propose as important operations for building strong encryption algorithms?

Confusion and diffusion Signup and view all the answers

Which characteristic should determine the amount of labor appropriate for encryption and decryption according to Shannon's guide?

Amount of secrecy required Signup and view all the answers

What is the primary purpose of message authentication codes?

Verifying the integrity and authenticity of a message Signup and view all the answers

What is the purpose of authenticated encryption?

Providing both confidentiality and integrity of messages Signup and view all the answers

What is the main property of modern block ciphers achieved through diffusion?

Hiding statistical properties of the plaintext Signup and view all the answers

What should determine the amount of labor appropriate for encryption and decryption according to Shannon's guide?