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Re: [Cfrg] Crystalline Cipher

Paul Lambert <paul@marvell.com> Wed, 20 May 2015 23:57 UTC

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From: Paul Lambert <paul@marvell.com>
To: Mark McCarron <mark.mccarron@eclipso.eu>
Thread-Topic: [Cfrg] Crystalline Cipher
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Date: Wed, 20 May 2015 23:57:35 +0000
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References: <78c28854a0cbb9ab7930141285059c6c@mail.eclipso.de> <2F4CC1DD-32CE-4D0A-B8F6-7BCEAD39F931@shiftleft.org> <55433468cb391822b334aa3363962202@mail.eclipso.de> <3636d4bb271a49b3aa1639fb60d1eff9@ustx2ex-dag1mb2.msg.corp.akamai.com> <26eb1f34d6df100bcce8c756c5cd0515@mail.eclipso.de> <20150520235459.GJ19183@localhost>
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Cc: "cfrg@irtf.org" <cfrg@irtf.org>
Subject: Re: [Cfrg] Crystalline Cipher
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See Schneier on the topic ...
	https://www.schneier.com/crypto-gram/archives/1998/1015.html#cipherdesign





Paul




On 5/20/15, 4:55 PM, "Nico Williams" <nico@cryptonector.com> wrote:

>On Thu, May 21, 2015 at 01:22:44AM +0200, Mark McCarron wrote:
>> The cipher uses random noise to move bits/bytes whilst XORing the
>> [...]
>
>If they are random then you have to send them (and they won't compress).
>
>So now you have two problems: how to encrypt data, and how to encrypt
>the one-time pad (so you can send it, so the recipient can use it to
>decrypt the plaintext).
>
>Not to mention the lack of integrity protection.
>
>> The claims are not drawn from thin air, they are accurate statements
>> of the process.  [...]
>
>Your claims show lack of experience.
>
>One-time pads are perfect if never reused and if you hand-wave away the
>problem of how to securely distribute the pads in the first place.
>
>But it's difficult to ensure that pads are never reused.
>
>And it's difficult to securely exchange/distribute one-time pads.
>
>In short, one-time pads are not practical.
>
>(Stream ciphers generate a pad for XORing, but by using small keys to
>generate the pad, their key management problems are reduced to the same
>sort of problem as for block ciphers.)
>
>Nico
>-- 
>
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