[cryptography] The Unbreakable Cipher (2)

Eugen Leitl eugen at leitl.org
Thu Sep 26 02:45:47 EDT 2013


----- Forwarded message from coderman <coderman at gmail.com> -----

Date: Wed, 25 Sep 2013 23:38:58 -0700
From: coderman <coderman at gmail.com>
To: brian carroll <electromagnetize at gmail.com>
Cc: cpunks <cypherpunks at cpunks.org>
Subject: Re: The Unbreakable Cipher (2)

On Wed, Sep 25, 2013 at 9:29 PM, brian carroll
<electromagnetize at gmail.com> wrote:
> ...
>  no- not for a multilinear/nonlinear bit set approach. voluminous data
> exchange...

you're wrong.

the key is to re-key so frequently there is never a significant volume
transferred under the same symmetric key.

in the manually keyed IPsec experiment i mentioned in another thread,
we used synchronized key daemons to maintain a rolling pair of
SA/AH+ESP associations that rotated on a per second interval.

as long as you didn't transfer more than some obtuse number of
terabits in a given second the assurance provided by a random key is
intact. (and we used VIA C5P dual RNG processors to provide the manual
keying material that was kept in sync between a pair of communicating
stations over unencrypted 802.11b - there was no IKE or other public
key exchange, just synchronized symmetric ciphers and digests)

----- End forwarded message -----
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Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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