the question is : encrypt and decrypt message with length 64 char by using matlab ... this code is an example of encrypt decrypt message of 12 char

d=['z' 'i' 'a' 'd' '' 'a' 'l' 'q' 'a' 'd' 'i' '' ], d1=uint8(d); %inv d1 k=13; for i=1:12 c(k)=d1(i); k=k-1; end %add 3n-2 for i=1:12 c(i)=c(i)+3*i-2; end %subtract 3n-2 for i=1:12 m(i)=c(i)-3*i+2; end %iners n=12; for i=1:12 r(n)=m(i); n=n-1; end d char(r)

[Purushottama Rao]

what is that you are looking for? An explanation on above code?

[yazan hejjawe]

decrypt encrypt mesaage 64 char by using matlabs codes like above codes

[Walter Roberson]

Which part is the "message"? Which part is the "encrypted message"? What information is being given to you to decrypt? For example are you given s and k ?

Answer 1

[James Tursa]

If you want to use the 5 x 5 code above, break the input into 25 character sets and process each set separately. If you have one set less than 25 pad with something (e.g., blanks with value 32).