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On 06/15/2017 07:32 PM, Grant Schultz wrote:
<blockquote type="cite"
cite="mid:mailman.1.1497715201.38987.cryptography@metzdowd.com"><br>
<blockquote type="cite">
<pre wrap="">What if the encryption method was the one-time pad? Naively, you could
carry a one-time pad on paper, along with a pencil. You would perform
the en/decryption manually, and type the message into the phone. (Of
course the smartphone with its cameras would be in your pocket during
en/decryption.)
</pre>
</blockquote>
<pre wrap=""><a class="moz-txt-link-abbreviated" href="mailto:bear@sonic.net">bear@sonic.net</a> wrote:</pre>
</blockquote>
<blockquote>It would work, but you'd want something less unwieldy
than a one-time pad. I think you would want some kind of purely
mechanical device, so that users could verify for themselves that
it is unhacked and unhackable. All parts visible.<br>
</blockquote>
<br>
Yes, the all-parts-visible is the important aspect.
<blockquote type="cite"
cite="mid:mailman.1.1497715201.38987.cryptography@metzdowd.com">
<pre wrap="">And neither of these methods gets around the difficulty of typing random
characters into a smartphone.
</pre>
</blockquote>
That's why I was aiming for a device that could show a line of text
on a physical display (perhaps a stack of wheels of some sort), so
that the ciphertext could just be photographed right off the device.<br>
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