<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p> </p>
<div class="moz-text-html" lang="x-unicode">
<div class="moz-forward-container">Hi there, <br>
</div>
<div class="moz-forward-container"><br>
</div>
<div class="moz-forward-container">I've managed to to use this
tool as suggested below.<a rel="external nofollow noopener
noreferrer" target="_blank" tabindex="-1"
href="https://f-droid.org/packages/us.spotco.extirpater/"
class="moz-txt-link-freetext"><br>
https://f-droid.org/packages/us.spotco.extirpater/</a></div>
<div class="moz-forward-container">
<p>It locates in a android 7.0 (Galaxy s6) phone, a primary and
secondary storage. No SD card is plugged in. Both about 27G<br>
</p>
<p>I think this is the difference between internal and external
storage.</p>
<p><a class="moz-txt-link-freetext"
href="https://medium.com/@babul.sust.cse/understanding-of-android-storage-system-17b6134f873">https://medium.com/@babul.sust.cse/understanding-of-android-storage-system-17b6134f873</a></p>
<p>external in this case is still on the phone (not SD card),
but users have access to it via Files. Compared to internal
which users can't see in files. <br>
</p>
<p>If so, this would be a good reason to use this app, rather
than just relying on overwriting data with files via USB as I
have seen suggested in other forums <br>
</p>
</div>
<div class="moz-forward-container">Let me know if this makes
sense?</div>
<div class="moz-forward-container"><br>
</div>
<div class="moz-forward-container">Thanks</div>
<div class="moz-forward-container">Mick</div>
<div class="moz-forward-container"><br>
</div>
<div class="moz-forward-container">-------- Forwarded Message
--------
<table class="moz-email-headers-table" cellspacing="0"
cellpadding="0" border="0">
<tbody>
<tr>
<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Subject:
</th>
<td>Re: [HacktionLab] wiping phones data</td>
</tr>
<tr>
<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Date:
</th>
<td>Thu, 23 Nov 2023 18:55:31 +0000</td>
</tr>
<tr>
<th valign="BASELINE" nowrap="nowrap" align="RIGHT">From:
</th>
<td>mat A <a class="moz-txt-link-rfc2396E"
href="mailto:mat@de-mystify.co.uk"><mat@de-mystify.co.uk></a></td>
</tr>
<tr>
<th valign="BASELINE" nowrap="nowrap" align="RIGHT">To: </th>
<td>mickfuzz <a class="moz-txt-link-rfc2396E"
href="mailto:mickfuzz23@gmail.com"><mickfuzz23@gmail.com></a>,
<a class="moz-txt-link-abbreviated
moz-txt-link-freetext"
href="mailto:hacktionlab@lists.aktivix.org">hacktionlab@lists.aktivix.org</a></td>
</tr>
</tbody>
</table>
<br>
<br>
<div data-html-editor-font-wrapper="true" style="font-family:
arial, sans-serif; font-size: 13px;">
<p>this tool writes zero's or randomness to free space on
internal and external sd drives:</p>
<p><a rel="external nofollow noopener noreferrer"
target="_blank" tabindex="-1"
href="https://f-droid.org/packages/us.spotco.extirpater/"
class="moz-txt-link-freetext">https://f-droid.org/packages/us.spotco.extirpater/</a></p>
<p>Works on android 4 and up so should be adequate for the use
case and avoiding re install,</p>
<p>Mat</p>
<br>
November 22, 2023 6:11 PM, "mickfuzz" <<a target="_blank"
tabindex="-1"
href="mailto:mickfuzz23@gmail.com?to=%22mickfuzz%22%20<mickfuzz23@gmail.com>">mickfuzz23@gmail.com</a>>
wrote:<br>
<blockquote>
<div>
<div>
<div>On 21/11/2023 22:00, sb wrote:</div>
<blockquote type="cite"
cite="mid:5ECC1B55-D91B-4067-95B2-3508C6BDB896@riseup.net">
<div dir="auto">Hi all,<br>
<br>
Long time lurker here, hi. The question is how deep
do you want to go?<br>
</div>
</blockquote>
<p>Not too deep if I'm honest. The main thing is this. I
would like to be able to say to people that donate
their phones for reuse something like.</p>
<p>"We wipe the user data from the phone in a way which
makes it impractical for the next user to read it."</p>
<p>So not impossible / military grade no fragments etc.
But in practical terms it's not going to happen with
any off the shelf tools.</p>
<p>In all likelihood a factory reset would be adequate,
but I would like to go further and prevent people from
using a tool like dd rescue (gui) to recover files for
phones before they were encrypted by default.</p>
So some kind of tool to write zeros, overwrite old data
seems like a good idea. Any suggestions welcome for
android pre-10
<p>So I do want to avoid having to install a new OS as
that'll probably be overkill for this project I would
hope.</p>
<p>Thanks everyone for their help so far.</p>
<div>On 22/11/2023 14:09, Michael Rogers wrote:</div>
<blockquote type="cite"
cite="mid:6c556c6f-4f1b-461d-83d6-6544af37c599@briarproject.org">On
21/11/2023 22:00, sb wrote:
<blockquote type="cite" style="color: #007cff">When
doing a factory reset, there is actually a duplicate
hidden partition of the main one, that just gets
reloaded onto the main one if it goes down. When you
flash the bootloader with another manager, that's
how you get access. Hope that makes sense. I have no
idea about iPhone s.</blockquote>
<br>
I think this is only the system partition though, not
the user partition where all your personal data's
stored. A factory reset should wipe the user partition
but not either of the system partitions.<br>
</blockquote>
<p>That was the impression that I got too. This would be
good to confirm one way or other.</p>
<p>nice one<br>
Mick</p>
</div>
</div>
</blockquote>
<br>
<br>
<br>
<br>
</div>
</div>
</div>
<div class="moz-cite-prefix">On 23/11/2023 18:55, mat A wrote:<br>
</div>
<blockquote type="cite"
cite="mid:844363a6d7e03c386012582bc4433ebd@de-mystify.co.uk">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<div data-html-editor-font-wrapper="true" style="font-family:
arial, sans-serif; font-size: 13px;">
<p>this tool writes zero's or randomness to free space on
internal and external sd drives:</p>
<p><a rel="external nofollow noopener noreferrer"
target="_blank" tabindex="-1"
href="https://f-droid.org/packages/us.spotco.extirpater/"
moz-do-not-send="true" class="moz-txt-link-freetext">https://f-droid.org/packages/us.spotco.extirpater/</a></p>
<p>Works on android 4 and up so should be adequate for the use
case and avoiding re install,</p>
<p>Mat</p>
<br>
November 22, 2023 6:11 PM, "mickfuzz" <<a target="_blank"
tabindex="-1"
href="mailto:mickfuzz23@gmail.com?to=%22mickfuzz%22%20<mickfuzz23@gmail.com>"
moz-do-not-send="true">mickfuzz23@gmail.com</a>> wrote:<br>
<blockquote>
<div>
<div>
<div>On 21/11/2023 22:00, sb wrote:</div>
<blockquote type="cite"
cite="mid:5ECC1B55-D91B-4067-95B2-3508C6BDB896@riseup.net">
<div dir="auto">Hi all,<br>
<br>
Long time lurker here, hi. The question is how deep do
you want to go?<br>
</div>
</blockquote>
<p>Not too deep if I'm honest. The main thing is this. I
would like to be able to say to people that donate their
phones for reuse something like.</p>
<p>"We wipe the user data from the phone in a way which
makes it impractical for the next user to read it."</p>
<p>So not impossible / military grade no fragments etc.
But in practical terms it's not going to happen with any
off the shelf tools.</p>
<p>In all likelihood a factory reset would be adequate,
but I would like to go further and prevent people from
using a tool like dd rescue (gui) to recover files for
phones before they were encrypted by default.</p>
So some kind of tool to write zeros, overwrite old data
seems like a good idea. Any suggestions welcome for
android pre-10
<p>So I do want to avoid having to install a new OS as
that'll probably be overkill for this project I would
hope.</p>
<p>Thanks everyone for their help so far.</p>
<div>On 22/11/2023 14:09, Michael Rogers wrote:</div>
<blockquote type="cite"
cite="mid:6c556c6f-4f1b-461d-83d6-6544af37c599@briarproject.org">On
21/11/2023 22:00, sb wrote:
<blockquote type="cite" style="color: #007cff">When
doing a factory reset, there is actually a duplicate
hidden partition of the main one, that just gets
reloaded onto the main one if it goes down. When you
flash the bootloader with another manager, that's how
you get access. Hope that makes sense. I have no idea
about iPhone s.</blockquote>
<br>
I think this is only the system partition though, not
the user partition where all your personal data's
stored. A factory reset should wipe the user partition
but not either of the system partitions.<br>
</blockquote>
<p>That was the impression that I got too. This would be
good to confirm one way or other.</p>
<p>nice one<br>
Mick</p>
</div>
</div>
</blockquote>
<br>
<br>
<br>
<br>
<signature></signature></div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
HacktionLab mailing list
<a class="moz-txt-link-abbreviated" href="mailto:HacktionLab@lists.aktivix.org">HacktionLab@lists.aktivix.org</a>
<a class="moz-txt-link-freetext" href="https://lists.aktivix.org/mailman/listinfo/hacktionlab">https://lists.aktivix.org/mailman/listinfo/hacktionlab</a>
</pre>
</blockquote>
</body>
</html>