[146736] in cryptography@c2.net mail archive
Re: [Cryptography] XORing plaintext with ciphertext
daemon@ATHENA.MIT.EDU (Carl Ellison)
Sat Sep 7 14:48:58 2013
X-Original-To: cryptography@metzdowd.com
In-Reply-To: <30F50A1C-A97C-4BA9-A77B-BF53C3ECBE58@callas.org>
From: Carl Ellison <cme@acm.org>
Date: Sat, 7 Sep 2013 07:15:39 -0400
To: Jon Callas <jon@callas.org>
Cc: Cryptography List <cryptography@metzdowd.com>, Jon Callas <jon@callas.org>,
Dave Horsfall <dave@horsfall.org>
Errors-To: cryptography-bounces+crypto.discuss=bloom-picayune.mit.edu@metzdowd.com
If it were the straight Vernam cipher then this would yield the key. But that gets you nothing since that key is never reused.
Sent from my phone
On Sep 7, 2013, at 4:13 AM, Jon Callas <jon@callas.org> wrote:
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> On Sep 7, 2013, at 12:14 AM, Dave Horsfall <dave@horsfall.org> wrote:
>
>> Got a question that's been bothering me for a whlie, but it's likely
>> purely academic.
>>
>> Take the plaintext and the ciphertext, and XOR them together. Does the
>> result reveal anything about the key or the painttext?
>
> It better not. That would be a break of amazing simplicity that transcends broken.
>
> Jon
>
>
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