CSC 2045 Cryptography Week 6 Quiz

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Questions and Answers

What is the main purpose of cryptography?

To create more complex codes for programming

To enhance graphical user interface designs

To facilitate faster communication between devices

To ensure the confidentiality and integrity of information (correct)

Which cipher is characterized by shifting letters in the alphabet?

Vigenère Cipher

Enigma Cipher

Caesar Cipher (correct)

Polyalphabetic Cipher

What technique is used in symmetric encryption methods?

Employing the same key for both encryption and decryption (correct)

Implementing complex mathematical algorithms

Using different keys for encryption and decryption

Utilizing public key systems for secure transactions

What is the function of a frequency fingerprint in cryptography?

To identify patterns within the encrypted text Signup and view all the answers

Which statement accurately defines a cipher?

A method for encrypting or decrypting information Signup and view all the answers

Which technique does the Enigma machine primarily utilize?

Rotating disks to alter letter mappings Signup and view all the answers

What is the purpose of the Diffie-Hellman key exchange?

To allow two parties to generate a shared secret key over a public channel Signup and view all the answers

Which of the following statements correctly describes RSA encryption?

It is based on the mathematical problem of factoring large prime numbers. Signup and view all the answers

What do we call the approach of breaking a cipher by testing all possible keys?

Brute force attack Signup and view all the answers

What does the term plaintext refer to in cryptography?

The original information before encryption Signup and view all the answers

What is the main benefit of encryption for data transmitted over the Internet?

It makes data unreadable to unauthorized users. Signup and view all the answers

What happens to data when it is encrypted?

It is scrambled to hide its original content. Signup and view all the answers

What is the role of a secret key in the encryption process?

It allows for the unscrambling of encrypted data. Signup and view all the answers

What type of cipher is the Caesar Cipher classified as?

Substitution cipher Signup and view all the answers

What key characteristic defines symmetric encryption techniques?

Only one key is used for both encryption and decryption. Signup and view all the answers

How does the Vigenère Cipher differ from the Caesar Cipher?

It utilizes an entire word as the shift key. Signup and view all the answers

What is a significant weakness of the Vigenère Cipher despite its complexity?

It can be cracked with sufficient frequency analysis. Signup and view all the answers

What best distinguishes a code from a cipher?

Codes map meaningful units to symbols while ciphers perform operations on letters. Signup and view all the answers

Which statement accurately describes a codebook?

A codebook allows for the translation of entire phrases into symbols. Signup and view all the answers

Study Notes

Course Information

Course name: CSC 2045 Cryptography

Objectives

Explore the history of secret message hiding techniques
Understand different encryption and decryption methods
Apply symmetrical encryption methods to decipher codes

Week 6 Agenda

What is cryptography?
Caesar Cipher
Frequency Fingerprint
Polyalphabetic Cipher
Enigma Cipher
Ciphers and Codes
Modern Cryptography: Keys
Modern Cryptography: RSA

Cryptography Definitions

Cryptography: The art and science of keeping messages secret
Encryption: The process of converting readable data into an unreadable format
Decryption: The process of converting encrypted data back into readable format

Additional Tasks

Watch the video "Intro to Cryptography"
Read the tutorial on "Need for Encryption"
Khan Academy Exploration: Caesar Cipher
Khan Academy Exploration: Frequency Fingerprint
Khan Academy Symmetric Encryption Techniques (Caesar Cipher, Polyalphabetic Cipher) with practice problems
Khan Academy Ancient Cryptography sections (One-time Pad, Enigma Machine), including exploration of the Enigma Machine online simulator
Khan Academy tutorial on Ciphers vs. Codes (defining cipher, code, plaintext)
Khan Academy sections on shift cipher, brute force attack, XOR bitwise operation, XOR and the one-time pad with practice problems
Khan Academy sections on Public key cryptography, practice problems, Data Encryption Techniques, discrete logarithm problem, and Diffie-Hellman key exchange
Khan Academy RSA encryption (steps 1-4), Euler's totient function, and practice problems.

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Description

Test your knowledge on cryptography concepts and techniques learned in week 6 of CSC 2045. This quiz covers various ciphers such as the Caesar Cipher and Polyalphabetic Cipher, as well as key aspects of modern cryptography. Challenge your understanding of encryption and decryption methods with this engaging quiz!