Preview

07 - Caesar cipher

 1. Who is the Caesar cipher named after?
caesar_q1.jpg

  Caesar Pelli

  Cesare Lattes

  Julius Caesar

  Caesar Frank

 2. The Caesar cipher is also known as …

  the follow on cipher

  the one up cipher

  the spacial cipher

  the shift cipher

 3. What type of cipher is the Caesar cipher?

  An exchange cipher

  A substitution cipher

  An unbreakable cipher

  A polyalphabetic cipher

 4. The Caesar cipher replaces each plaintext letter with another letter a fixed position further in the alphabet.

  FALSE

  TRUE

 5. The distance between each plaintext and ciphertext letter is the …

  entry

  key

  guard

  lock

 6. If the Caesar cipher shift is two, how would HELLO WORLD appear in ciphertext?

  JGNNQ YQTNF

  JGNNQ XPSME

  JGNNQ YQTOG

  JGNNQ ASVPH

 7. What is the most frequently used letter in the English language?

  E

  N

  A

  O

 8. Letter frequency can often be used to break a Caesar cipher as the shift is the same for each letter.

  TRUE

  FALSE

 9. Using frequency analysis, what is the most likely plaintext of RJJYRJFYYMJGWNILJ?

  DOOR OPENS OUTWARDS

  GOOD TO BRING PARCEL

  HOW THIS TIME PASSES

  MEET ME AT THE BRIDGE

 10. The ROT13 algorithm is an example of a Caesar cipher.

  TRUE

  FALSE


Report an error