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+[[!meta title="OpenPGP public-key cryptography"]]
+
+With <span class="application">Tails gpgApplet</span> you can **encrypt or sign
+text using the public key encryption of OpenPGP**.
+
+[[!inline pages="doc/encryption_and_privacy/gpgapplet.warning" raw="yes"]]
+
+<div class="note">
+
+<strong>This technique requires you to use public-key
+cryptography.</strong> If you never used OpenPGP keys before, you might
+rather want to encrypt your text using a passphrase with OpenPGP
+passphrase encryption. [[See the corresponding
+documentation.|gpgapplet/passphrase_encryption]]
+
+</div>
+
+1. Write your text in a text editor. **Do not write it in the web browser!**
+
+ For example, open <span class="application">gedit</span> from the menu
+ <span class="menuchoice">
+ <span class="guimenu">Applications</span>&nbsp;▸
+ <span class="guisubmenu">Accessories</span>&nbsp;▸
+ <span class="guimenuitem">gedit Text Editor</span></span>.
+
+2. Select with the mouse the text that you want to encrypt or sign. To
+copy it into the [[!wikipedia Clipboard_(computing) desc="clipboard"]],
+right-click on the selected text and choose <span
+class="guimenuitem">Copy</span> from the menu.
+
+ <span class="application">Tails gpgApplet</span> now show
+ lines of text, meaning that the clipboard contains non-encrypted text.
+
+ [[!img gpgapplet_with_text.png link=no alt="Tails gpgApplet with lines of
+ text"]]
+
+3. Click on <span class="application">Tails gpgApplet</span> and select <span
+class="guimenuitem">Sign/Encrypt Clipboard with Public Keys</span> from the
+menu.
+
+ If you receive the error message “<span class="guilabel">The clipboard does
+ not contain valid input data</span>”, try to copy your text again, starting
+ from step 2.
+
+4. If you want to encrypt the text, select one or more public keys for the
+recipients of the encrypted text in the <span class="guilabel">Choose
+keys</span> dialog box. To select a public key, double-click on the
+corresponding line in the <span class="guilabel">Select recipients</span> list
+box.
+
+5. If you want to sign the text, select the secret key with which you want to
+sign the text in the <span class="guilabel">Sign message as</span> drop-down
+list.
+
+6. If you want to hide the recipients of the encrypted text, select the <span
+class="guilabel">Hide recipients</span> check box. Otherwise anyone who sees the
+encrypted text can know who the recipients are.
+
+7. Click on the <span class="guilabel">OK</span> button.
+
+ If you receive the warning message <span class="guilabel">Do you trust these
+ keys</span>, answer it accordingly.
+
+8. If you selected one or several public keys to encrypt the text,
+<span class="application">Tails gpgApplet</span> now shows a padlock, meaning
+that the clipboard contains encrypted text.
+
+ [[!img gpgapplet_with_padlock.png link=no alt="Tails gpgApplet with a
+ padlock"]]
+
+ If you only selected a secret key to sign the text, <span
+ class="application">Tails gpgApplet</span> now shows a seal, meaning that the
+ clipboard contains signed text.
+
+ [[!img gpgapplet_with_seal.png link=no alt="Tails gpgApplet with a seal"]]
+
+9. To paste the encrypted or signed text into another application, right-click in
+the application where you want to paste it and choose <span
+class="guimenuitem">Paste</span> from the menu.
+
+ For example, you can paste it into the web browser to send it by email.
+
+ [[!img browser_paste.png link=no alt="Encrypted text starting with
+ -----BEGIN PGP MESSAGE-----"]]
+
+<div class="next">
+
+You can also [[decrypt or verify a text that is encrypted or signed using
+public-key cryptography|decrypt_verify]] using <span class="application">Tails
+gpgApplet</span>.
+
+</div>