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Exam (elaborations)

COSC 316 Final (Wu) || All Questions Answered Correctly.

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  • Course
  • COSC 316
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  • COSC 316

Conventional Ciphers correct answers Caeser, Vigenere, (Substitution/transposition operations) Private key Algorithms correct answers Symmetric (All Conventional ciphers, DES, AES) Public-Key Algorithms correct answers RSA, Diffie-Hellman Block-Ciphers correct answers DES,AES,RSA Steam ...

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  • August 20, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • COSC 316
  • COSC 316
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COSC 316 Final (Wu) || All Questions Answered Correctly.
Conventional Ciphers correct answers Caeser, Vigenere, (Substitution/transposition operations)

Private key Algorithms correct answers Symmetric (All Conventional ciphers, DES, AES)

Public-Key Algorithms correct answers RSA, Diffie-Hellman

Block-Ciphers correct answers DES,AES,RSA

Steam Ciphers correct answers Hardware ciphers

Computational Security correct answers Given limited computing resources, (pc power, amount
of time needed for calculations is great (ex: 200 yrs), the cipher cannot be broken

Unconditional Security correct answers No matter how much power and time are given, cipher
cannot be broken

Claude Shannon correct answers 1949 introduced idea of developing ciphers based on
Substitution and Permutation

Shannon's Idea correct answers forms the basis of modern block ciphers

According to Shannon: correct answers A cipher, which well combines Sub and perm elements,
may achieve confusion and diffusion, this, it is secure

Feistel Cipher Design Principles correct answers Increasing block size provides greater
security(reduces speed); Key size improves security (makes key searching harder, but may slow
cipher); Num of Rounds: increasing improves security, but makes it less efficient (typically 16
rounds); Sub-key Generation: greater complexity can make analysis harder (slows); Round
Function: greater complexity can make analysis harder (slows); Fast software en/decryption and
ease of analysis: are most recent concerns for practical use and testing

Data Encryption Standard (DES) correct answers issued in 70s, as an encryption standard, 64-bit
using 56 bit key

Advanced Encryption Standard (AES) correct answers Issued as standard in 2001, replacing
DES

What were DES and AES both designed to do correct answers to try and achieve confusiong and
diffusion using Sub and Perm operations

AES correct answers Replaced DES, encrypting 128 bit data (4 groups of 4 bytes), using
128/192/256 bit keys

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