Microsoft DRM2 cracked, source code released
Sat, 27 Oct 2001 21:12:33 +0200 (MET DST)
Of course the DRM scheme isn't encryption, just obfuscation which just
happens to use some crypto bits and bobs. Kind of like building a
chain by tying steel links together with bits of thread. So it got
reverse-engineered, rather than actually having the crypto broken.
However one of the things found is a new Microsoft block cipher (used
for a MAC) dubbed MultiSwap. Ten days later, and...
Cryptanalysis of Multiswap
Nikita Borisov, Monica Chew, Rob Johnson, and David Wagner
We have seen that MultiSwap can be broken with a 2^14 chosen-plaintext
attack or a 2^22.5 known-plaintext attack, requiring 2^25 work. We
believe this shows that MultiSwap is not safe for any use.
Seems like these big companies need laws like DMCA to "protect" their
content, because they're so fricking incompetent that they can't do it
properly by technical means. Of course a contributory factor in some
cases is that they try to do impossible things like reliable watermarks etc.
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