Hi!
I suggest not reinventing the wheel and maybe start with the source code
of cryptool:
http://www.cryptool.com/
It can display entropy, auto correlation, and 'floating frequency' (?), ...
I played a bit with it recently and it's humm graphically interesting.
source code is gpl
+
serpilliere
Emmanuel Fleury wrote:
JD wrote:
Does anybody got fresh ideas ?
Hmmm, we should drop the child plays and start coding some real tools to
perform a serious analysis of the binaries we've got by now...
Information Entropy: http://en.wikipedia.org/wiki/Information_entropy
Coincidence Index: http://en.wikipedia.org/wiki/Index_of_coincidence
Differential Cryptanalysis:
http://en.wikipedia.org/wiki/Differential_cryptanalysis
For more, see: http://en.wikipedia.org/wiki/Category:Cryptographic_attacks
And trying to find some cribs
(http://en.wikipedia.org/wiki/Crib_%28cryptanalysis%29) would help.
Note: Performing a XOR on the two binaries would reveal a mask of
unchanged locations (the XOR function will be on hexadecimal digits
meaning a XOR b = (a!=b)?1:0. All the zeroed area will be unchanged
while oned area will be modified).
That's all folks!
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