passphrases with more than 160 bits of entropy

[Aram Perez]

On Mar 22, 2006, at 4:28 AM, Thierry Moreau wrote:

> Travis H. wrote:
>> Hi,
>> Does anyone have a good idea on how to OWF passphrases without
>> reducing them to lower entropy counts?  That is, I've seen systems
>> which hash the passphrase then use a PRF to expand the result --- I
>> don't want to do that.  I want to have more than 160 bits of entropy
>> involved.
>
> More than 160 bits is a wide-ranging requirement.
>
> Entropy is a highly discussed unit of measure.

And very often confused. While you do want maximum entropy, maximum  
entropy is not sufficient. The sequence of the consecutive numbers 0  
- 255 have maximum entropy but have no randomness (although there is  
finite probability that a RNG will produce the sequence).

Regards,
Aram Perez


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