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<div class="moz-cite-prefix">On 6/16/2017 10:29 AM, james hughes
wrote:<br>
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<blockquote type="cite"
cite="mid:6B81566C-D8FE-4B8B-AE0E-77006CE7C444@me.com">
<div>On Jun 15, 2017, at 7:32 PM, Grant Schultz <<a
href="mailto:gschultz@kc.rr.com" class=""
moz-do-not-send="true">gschultz@kc.rr.com</a>> wrote:
<blockquote type="cite" class=""><br
class="Apple-interchange-newline">
<div class=""><span style="font-family: Helvetica; font-size:
12px; font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; text-align:
start; text-indent: 0px; text-transform: none;
white-space: normal; word-spacing: 0px;
-webkit-text-stroke-width: 0px; float: none; display:
inline !important;" class="">Besides pencil and paper, is
there any sort of mechanism you can envision that would
aid in en/decryption in conjunction with a one-time pad,
where (with the plaintext and key hidden) you could then
photograph the ciphertext (perhaps showing on wheels of
some sort), and transmit the photograph. On the other
end, the ciphertext could be manually entered into the
recipient's device and decrypted. This would bypass the
tedium of typing random letters into the smartphone.</span><br
style="font-family: Helvetica; font-size: 12px;
font-style: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; text-align:
start; text-indent: 0px; text-transform: none;
white-space: normal; word-spacing: 0px;
-webkit-text-stroke-width: 0px;" class="">
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<br class="">
<div class="">Visual Cryptography. </div>
</blockquote>
My understanding of visual cryptography is that it requires the use
of preprinted transparencies that can be held near or over the
transmitted graphic to form the plain visual message. The problem
is how to get the transparency near the phone's display without the
camera being able to snap a pic of it during that process.
Furthermore, it requires software to generate the visual patterns
and create the ciphertext. But yes, I did consider that technology.<br>
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