Re: Key entropy, stream entropy, block entropy, block population entropy AKA uniique stream length

On 5 Feb, 23:26, rossum <rossu...@xxxxxxxxxxxx> wrote:
On 5 Feb 2007 09:36:28 -0800, j...@xxxxxxxx wrote:

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.

Then how can you decrypt a message? If the block entropy exceeds the
key entropy, then given the key the receiver cannot decide which of
the possible blocks the key can generate is the correct block to
decrypt with.

rossum

Keyexpanded shuffles/permuation ciphers are not key to block 1:1
ciphers.
They are key to stream 1:1 ciper

So there is really no problem, you have to know where you are in the
permutation cycle for the key that is all.

Jonas Thörnvall

.

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