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We next enter the coded message into a new matrix B , by entering it letter by letter into the columns of B . Note
We next enter the coded message into a new matrix by entering it letter by
letter into the columns of Note that since the encrypting matrix is a
must have a rows for multiplication to be possible.
If the message is too short to fill matrix we use blank spaces to complete the final
column.
Step : Use the matrix to encrypt it
Computing the product encrypts the message, and only someone with access to
will be able to read it
The coded message is and
Deciphering a message
Step : Decipher the coded message from step
The received message is and
It is the result of the product To find matrix we apply since
Writing the received message in matrix form, we
have
Step : Next multiply by on the left to determine matrix
Writing matrix in sentence form gives
& and using the substitution cipher to replace numbers with letters,
reveals the message MATH IS SWEET.
Activity Unlock a coded message
Doctor Strange is in deep trouble. He is being pursed by Thanos and is presently hiding in a secret
location to escape from being captured by him. He needs to send messages to two of his comrades,
Thor and Captain America, to tell them about his situation and whereabouts. As such, he composes
his first message by replacing each letter in the message by a number according to the code in
Table below.
Table : Coding system
As Doctor Strange is afraid that his message will be intercepted and cracked by Thanos, therefore,
he decides to send the message in code together with a super hitech LOCK to Thor and Captain
America to unlock the coded message.
LOCK
With the use of Table and LOCK, what is the message that Doctor Strange is trying to send to Thor
and Captain America? Please show your working clearly on how you unlock the code message.
marks Activity Design your own substitution cipher
a Use the criteria indicated to create a pair of matrices & where the entries
of the matrix are all integers.
marks
i
ii
b Create your own substitution cipher. Then use it and the matrix you created in a to
encrypt the title of your favourite movie.
marks
c Use the matrix and the appropriate substitution cipher to decrypt the message from
b
marks
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