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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.
 
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Tor hides your location from destination servers, but it does not encrypt <i>all</i> your communication. The last relay of a Tor circuit, called the <i>exit node</i>, establishes the actual connection to the destination server. This last step can be unencrypted, for example, if you connect to a website using HTTP instead of HTTPS.
 
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Use the [[screen keyboard|doc/first_steps/accessibility#keyboard]], if you are using a public computer or worry that the computer might have a keylogger.
 
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