MATLAB: Encrypting a message in matlab

encryptionhomework

For the attached document, were supposed to encrypt a message, and I got the numbers to come out, but when I try to convert it back to a message it just displays the original message instead of the secret code. I'll attach my code, I have no idea whats wrong with it, and why it isnt working. Thanks.

Best Answer

Nick - look closely at your for loop

 for k=1:1

k is only ever going to be one. You need to iterate over each element of the number_message array. Hint: use length to do so.

Also, take a look at your code to add the key to the number_message array. Remember that the array is an array of doubles. What is the data type for your key?

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MATLAB: Decrypting a message in matlab

Nick - in the future, please tag your questions as homework. Note your condition

 if number_message(k)>=65 && number_message(k)<=90

If the above is true, then your encrypted value is between 65 and 90 and the following code is executed

 number_message(k)=number_message(k)-key

So the encrypted value has the key subtracted from it. That means that your new interval of values, which was [65, 90] is now [65-key, 90-key]. What is important is that the decrypted values can now be less than 65. This means that your next check should be for those values

 if number_message(k) < 65
     number_message(k) = ???
 end

So how should the above be adjusted?

MATLAB: Code to encrypt a string

There are tons of Caesar Cipher resources out there.

Here's a completed example

Also, delete one of these duplicate questions.

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MATLAB: Decrypting a message in matlab

MATLAB: Code to encrypt a string

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