Page 105 - NUMINO Challenge_C1

12 Expressions and Codes

Basic Concepts Decoding

Scytale is a type of code that was first used in the military in ancient
Greece in 450 BC. Messages are written on a strip of paper. The
messages can only be decoded when the strip of paper is wrapped
around a stick of a certain size.

PLREEIELANNNRELDEDSD .RAIGSNANAEFOLGKNRWIEIEIGSR.

P E R S I A K I
L L E D G E N E
R A L . S F R I
E N D R N O W G
E N E A A L I S
I N D N G E R

PERSIA KILLED GENERAL S FRIEND. NOW GENERAL IS IN DANGER.
Key: The clue needed to find the meaning of a code is called the key. The

key for this code is 2.
W V A E L E L A S R H S A . “`WALLS HAVE EARS.”

Example According to a code, PBLRI means Seoul. What city is ILKALK?
(The key to this code is 3.)

Class Notes

Since PBLRI is SEOUL, P S, B E, L O, R U, and I L.
Here are the 26 letters of the alphabet.
A B C D E F G H I J K L MNO PQR S T U VWX Y Z

In order for P to be S, you need to move spaces to the right from P.

Also for the other letters, B, L, R, and I, you need to move spaces

to the (right, left) to get E, O, U, and L.

The key to decoding this word is moving places to the (right, left).

Then, I , L , K , A , L , and K .

Therefore, the city that ILKALK stands for is .

102 NUMINO Challenge C1