Cross Co Relation Xcorr ? urgent Help Please !

2012 1 28
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i have two file text file of 64KB each. one is the plaintext and other is encrypted text i want to calculate the xcorr between them i use the following code
x=fopen('d:/plaintext.txt')
w=fread(x)
char(w)
y=fopen('d:/encryptedtext.txt')
v=fread(y)
char(v)
[c,lags] = xcorr(w,v)
plot(c,lags)
xlabel('Time Shift')
ylabel('Correlation Coefficient')
It shows graph but i dnt understand the output how matlab is processing the output how will i come to knw that my answer is right
HELP NEEDED URGENTLY

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Walter Roberson
Walter Roberson 2012-1-28
If the encrypted text is correlated with the original then the encryption process was not a good one.

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nanren888
nanren888 2012-1-28

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Try plot(lags,c) ? Is this what you are looking for? c(lags) is a similarity measure. Otherwise, maybe give a little more info?

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Ali Umair
Ali Umair 2012-1-28
Sir Thanks For the Reply But I wana ask that is there anything that must be include in the code to read and perform xcorr on 64kb file and how the result are interpreted how will i come to know that the answer is right ?,,what does lags means how its divide the time ?

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Walter Roberson
Walter Roberson 2012-1-28

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This is not a resource for HELP NEEDED URGENTLY. If you need help urgently, then you should be hiring a consultant, such as http://www.mathworks.com/services/consulting/
Note: I am not a consultant, and I am not employed or contracted by MathWorks or any related company or organization in any capacity.
Disclaimer: I did receive a baseball-style hat from MathWorks once.

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