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bio website github.com/ronalchn
location Auckland
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visits member for 2 years, 2 months
seen Jun 20 '13 at 3:30

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Sep
8
comment Are picture files “random enough” to be usable as a one-time pad?
It means that even though the image might be 1MB, you do not have 1MB of fully random data, by concentrating the entropy down to say 100KB, you might then have random data.
Sep
8
comment Are picture files “random enough” to be usable as a one-time pad?
Fully random means having enough entropy for the number of bits. For example, if you have 10 bits of random data, it should have entropy equivalent to 10 bits. If you have instead 20 bits of data with entropy equivalent to 10 bits, it is not completely random. However, if you are able to shrink the data to 10 bits, so that it is 10 bits with 10 bits of entropy, it becomes fully random.