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<div class="moz-cite-prefix">Dne 17.12.2016 v 1:16 Ray Dillinger
napsal(a):<br>
</div>
<blockquote
cite="mid:ca6fe053-70bc-2c3e-be19-16f0803fbaf2@sonic.net"
type="cite">
<pre wrap="">
On 12/16/2016 03:15 PM, Tom Mitchell wrote:
</pre>
<blockquote type="cite">
<pre wrap="">On Thu, Dec 15, 2016 at 6:43 PM, Ray Dillinger <a class="moz-txt-link-rfc2396E" href="mailto:bear@sonic.net"><bear@sonic.net></a> wrote:
</pre>
</blockquote>
<pre wrap="">
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">Whether contents are encrypted or not, crypto hardware is very
much worthwhile to build into cameras, because such hardware
could also do crypto authentication for evidentiary purposes.
</pre>
</blockquote>
</blockquote>
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">Evidentiary is not a consumer camera. My SWAG is evidentiary is
less than 1% of high quality cameras and perhaps 100% of cell phones.
</pre>
</blockquote>
<pre wrap="">
It's journos who are asking for this, and their cameras are definitely
part of that 1%. A reporter who can show that her footage isn't
tampered can limit the degree to which people are able to credibly deny
or discredit her story.
Now think evidence again. Outside of journalism and investigation
contexts, you don't know in advance which cameras are going to be used
to record something that becomes evidence. A random college student at a
demonstration takes footage of an incident of police brutality using
whatever camera they happen to be carrying, and either is, or isn't,
able to convince reporters/school officials that the incident wasn't
faked, or convince police higher-ups that it can't be credibly denied.
Bear
</pre>
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Everything
is about risks and mitigation, but there are lack of useable
equipment. May I'm
wrong about, but there are my view on the security, privacy,
unforgivable and
provable (of choice) authorship, easy to detect/defeat any
altering. Using
"swarm of cameras" or "online connected cameras" are
solution for special cases (hard to defeat in method that
thousands of people agreed of something fake), but general purpose
devices (any recorders for audio/video) missing.<br>
<br>
1) provable authenticity of media<br>
- when, where and which items used<br>
2) provable author (better provable on demand)<br>
- who, when, where and which items used<br>
3) security of data<br>
- there are FAT, not the ruberhoose filesystem<br>
- files are readable by anyone with appropriate technology<br>
4) security of media<br>
- SD/SDHC/SDXC (secure digital, can someone use it)<br>
- tamperproof encryption chip with some private values (almost
tamperproof, it
is hard to design and expensive)<br>
<br>
Risks for each case: <br>
1) Data can be easily modified or defeated...<br>
2) Authorship can be easily forget ...<br>
3) Stole data/pictures/videos, can be easily checked and captured
by anyone,
anyone can see the data ...<br>
4) Stole the media/modify data and cryptography signatures ...<br>
<br>
I not sure if there are something more than notes only:<br>
- Plaintext data in EXIF are useless, because can be easily
modified. Also,
doesn't avoid the tampering/modification.<br>
- hash/hmac or chain of hashes/hmacs cannot avoid modification,
because can be
computed again (in case that you have appropriate key, also the
chained HMAC).
This mean, hash function are good against random modification, but
for proper
procedure digital signature required. And digital signatures
require another
mechanisms ...<br>
- best to use some challenge-response mechanism or tamperproof
hardware (what
is 100% tamperproof?)<br>
- challenge-response mechanism can help, but better to use 3rd
party, for example
certificate authority (X.509 or distributed by blockchain)<br>
<br>
Do someone know the solution about?<br
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Jan<br style="mso-special-character:line-break">
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mso-para-margin-left:0mm;
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mso-hansi-theme-font:minor-latin;}
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<pre class="moz-signature" cols="72">
--
Jan Dušátko
Phone: +420 602 427 840
e-mail: <a class="moz-txt-link-abbreviated" href="mailto:jan@dusatko.org">jan@dusatko.org</a>
SkypeID: darmodej
GPG: <a class="moz-txt-link-freetext" href="http://www.dusatko.org/downloads/jdusatko.asc">http://www.dusatko.org/downloads/jdusatko.asc</a>
</pre>
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