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But an application that can connect to both resources on the Internet (going through Tor) and resources on the local network (without going through Tor) can deanonymize you.
 
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For example, your home router, your network printer, or the intranet of your company are usually on your local network, also called LAN for Local Area Network. In technical terms, this refers to the set of IP addresses defined in [RFC1918](https://tools.ietf.org/html/rfc1918), like IP addresses that start with `192.168`.
 
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The term "local network" refers to the set of computers and devices that can be reached directly from your computer without going through the Internet.
 
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When starting Tails, [[set up an administration password|doc/first_steps/welcome_screen/administration_password]].
 
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<ul>
<li>You can leave traces of your Tails activities on the hard disks.</li>
<li>If Tails is compromised, a malware could install itself on your usual operating system.</li>
<li>If an application in Tails is compromised, it could access private data on your disks and use it to deanonymize you.</li>
</ul>
 
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Please report your findings about using *Feather* in Tails on [[!tails_ticket 17823]].
 
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<p>See how we implement this [[memory
erasure|contribute/design/memory_erasure]], for example, if you want to
implement this feature outside of Tails.</p>
 
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<div class="next">
 
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</div>
 
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<p>In a <a
href="https://www.forensicfocus.com/stable/wp-content/uploads/2011/08/cold_boot_attack_for_forensiscs1.pdf">research
report from 2011</a>, Defense Research and Development Canada concluded that
cold boot attacks can be useful in some cases to acquire data in memory but are
not a panacea and have many drawbacks dictated by the laws of physics, which
cannot be overcome by the technique. The authors recommend to only use cold
boot attacks as a last resort when all other avenues have been exhausted.</p>
 
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<p>As far as we know, cold boot attacks are not a common procedure for
data recovery.</p>
 
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<div class="attack">
 
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After a computer is powered off, the data in RAM disappears rapidly, but it can remain in RAM up to several minutes after shutdown. An attacker having access to a computer before the data in RAM disappears completely could recover important data from your session.
 
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[[!img grub-with-options.png class="screenshot" alt="GRUB with a list of
options starting with 'setparams Tails'"]]
 
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[[!img install/inc/screenshots/grub.png class="screenshot" alt="Black screen ('GNU GRUB') with Tails
logo and 3 options: 'Tails' and 'Tails (Troubleshooting Mode)' and 'Tails (External Hard Disk)'."]]
 
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You can use the Boot Loader to modify the *boot options*. Boot options are special parameters used to troubleshoot or work around hardware support problems. For example, our [[list of known issues with graphics cards|support/known_issues/graphics]] documents boot options for different graphics cards.
 
02/27/2024

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