Engineering and Architecture

Question 1

Computationally / Unconditionally secure

Answer 1

if applying best known method, amount of resources required is greater than that within reach / not even with all the resources in the world

Question 2

Symmetric Key Cryptography

Answer 2

Encryption and Decryption keys are the same (security lies in keeping the key secret)

Question 3

Stream ciphers vs Block ciphers

Answer 3

Block Cipher Converts the plain text into cipher text by taking plain text’s block at a time. Stream Cipher Converts the plain text into cipher text by taking 1 byte of plain text at a time.

Question 4

ECB - Electronic Code Book

Answer 4

Simplest and most intuitive method to use a block chiper

Consists of dividing text into independent and contiguous blocks that are ciphered independently

Weakness: if two blocks are equal, their ciphertexts will be the same