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07 - Caesar cipher

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

  Caesar Frank

  Caesar Pelli

  Cesare Lattes

  Julius Caesar

 2. The Caesar cipher is also known as …

  the spacial cipher

  the follow on cipher

  the shift cipher

  the one up cipher

 3. What type of cipher is the Caesar cipher?

  A substitution cipher

  A polyalphabetic cipher

  An exchange cipher

  An unbreakable 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 …

  guard

  entry

  key

  lock

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

  JGNNQ YQTOG

  JGNNQ YQTNF

  JGNNQ XPSME

  JGNNQ ASVPH

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

  A

  N

  O

  E

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

  FALSE

  TRUE

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

  HOW THIS TIME PASSES

  MEET ME AT THE BRIDGE

  DOOR OPENS OUTWARDS

  GOOD TO BRING PARCEL

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

  TRUE

  FALSE


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