E CES 212 81 Actual Questions and Correct Answers

E CES 212 81 Actual Questions and Correct Answers



Q1
Algorithms that simply substitute one character of cipher text for one character of plain text,
these are the most primitive algorithms Types Include: CARA Caesar Affine Rot13 AtBash
Mono-Alphabet Substitution Cipher
Answer: Types Include: CARA Caesar




Q2
Hebrew cipher which substitutes the first letter of the alphabet for the last, and the second
letter for the second-to-last, in other words, it simply reverses the alphabet. Mono-Alphabet
Substitution Cipher IE: A cat sleeps - Start Z xzg hovvkh - Finish Atbash Cipher
Answer: second-to-last, in other words, it simply reverses the alphabet.




Q3
The a is some multiple ax + b(modM) - Affine 1x + 3(mod 26) - Caesar Affine Cipher
Answer: ax + b(modM) - Affine




Q4
A single alphabet substitution cipher where all characters are rotated 13 characters through the
alphabet. Mono-Alphabet Substitution Cipher IE: A CAT - Start N PNG - Finish ROT13 Cipher
Answer: rotated 13 characters through the alphabet.




Q5
Cipher Disk
Answer: Examples of Multi-Alphabet Substitution Ciphers Vigenere Cipher




Q6
Enigma Machine Physical device invented by Leon Alberti in 1466 Each turn of the disk
produces a new cipher by encrypting plaintext Multi-Alphabet Substitution Cipher
Answer: Physical device invented by Leon Alberti in 1466