Matlab Project、1

EK127 Matlab Project 1

Yiming Zhang (C1)

Folder name：Yiming_Zhang

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PART A: Write a function subEncrypt such that will encode a message using the simple substitution algorithm discussed in the introduction.

function encrypt=subEncrypt( plaintxt,key )
%this function help to encode a message using the simple substitution algorithm
%Your plaintxt should be entered in all capitals numkey=(65:90);
%stand for Letters A~Z encrypt=zeros(1,length(plaintxt));
%vectors with the length of your massage
%equivalents of the encrypted message. for ASC=1:length(plaintxt) num=find(numkey==plaintxt(ASC)); encrypt(ASC)=key(num); end end

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PART B: Write a function subDecrypt such that it will decrypt a message