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European Quality Label

Dear friends,

 

It was a real pleasure to collaborate with you on this project!

French Quality Label

 

Our first QL

 

Romanian QL

Quiz by Romania

Here is a small quiz to overlook what we learnt.

Gap-fill game about substitution ciphers by Lycée Carriat, Bourg-en-Bresse, France
Substitution ciphers

Substitution ciphers

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
DECODE THESE FOUR MESSAGES AND DISCOVER THEIR GLOBAL MEANING
Your first message is BRX. It has been encrypted with the Caesar cipher shift +3 . What is the plaintext? .
Your second message is HYL H NVVK. It has been encrypted with a Caesar cipher but you don't know the shift. What is the plain text ?
Your third message is XLWVYIVZPVI. It has been encryted with the Atbash cipher . What is the plain text?
Your fourth message is 23-5-12-12 4-15-14-5. It has been encrypted by a basic number code . What is the plain text?

SOME WELL-KNOWN SUBSTITUTION CIPHERS
  • What is the name of the code which uses dots and dashes?
  • What is the name of the code used by the blind and the visually impaired?
  • ??? The Square is a table that allows someone to translate letters into numbers.
  • ??? The cipher was used by Freemasons.

ALL THESE CIPHERS ARE SUBSTITUTION CIPHERS
The problem with these ciphers is that they are easy to