Key entropy, stream entropy, block entropy, block population entropy AKA uniique stream length
- From: jt64@xxxxxxxx
- Date: 5 Feb 2007 09:36:28 -0800
I've noticed many years ago that there seem to be confusion among some
novices regarding entropy (included myself)
I made a claim many years ago that some people refused and some still
refusing.
I said that the "BLOCK ENTROPY" within a cipher AKA the way to create
a UNIQUE block by downmixing internal streams in a cipher can exceed
the keyentropy.
Short simple explanation given two permutations XOR together and a XOR
with a buffer,
When the permutation reach the end there is not necessary the same
value in the buffer.
Also the key can actually be expanded to suitable length for a
permuation stream.
Who of you still refuse this *FACT* about resistance to chosen
plaintext attacs?
Well i can see Kristian Gjoesteen does....
I made another claim that the "block population entropy" AKA number of
unique combinations of blocks before algorithm to create stream
restart also can exceed the keyentropy.
Who of you still refuse this *FACT* about the resistance yo lookup
tables.
Well i can see Kristian Gjoesteen does....
Jonas Thörnvall
.
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