diff --git a/README.md b/README.md
index 64c9cd5..f0a6cbd 100644
--- a/README.md
+++ b/README.md
@@ -2461,6 +2461,21 @@ El procedimiento recomendado en la página oficial:
 
 ------------------------------------------------------------------------
 
+Element (cliente de matrix.org)
+-------------------------------
+
+Instalamos con:
+
+    sudo apt install -y wget apt-transport-https
+
+    sudo wget -O /usr/share/keyrings/riot-im-archive-keyring.gpg https://packages.riot.im/debian/riot-im-archive-keyring.gpg
+
+    echo "deb [signed-by=/usr/share/keyrings/riot-im-archive-keyring.gpg] https://packages.riot.im/debian/ default main" | sudo tee /etc/apt/sources.list.d/riot-im.list
+
+    sudo apt update
+
+    sudo apt install element-desktop
+
 Lector DNI electrónico
 ----------------------
 
@@ -2470,7 +2485,7 @@ Instalamos:
 
 Como root ejecutamos pcsc\_scan:
 
-    root@rasalhague:~# pcsc_scan 
+    root@rasalhague:~# pcsc_scan
     PC/SC device scanner
     V 1.4.23 (c) 2001-2011, Ludovic Rousseau <ludovic.rousseau@free.fr>
     Compiled with PC/SC lite version: 1.8.11
@@ -2480,7 +2495,7 @@ Como root ejecutamos pcsc\_scan:
 
 Si insertamos el lector veremos algo como esto:
 
-    root@rasalhague:~# pcsc_scan 
+    root@rasalhague:~# pcsc_scan
     PC/SC device scanner
     V 1.4.23 (c) 2001-2011, Ludovic Rousseau <ludovic.rousseau@free.fr>
     Compiled with PC/SC lite version: 1.8.11
@@ -2498,7 +2513,7 @@ Si insertamos un DNI veremos que se lee la información de la tarjeta
 insertada:
 
     Reader 0: C3PO LTC31 v2 (11061005) 00 00
-      Card state: Card inserted, 
+      Card state: Card inserted,
 
 y mas rollo
 
diff --git a/out/LinuxMintUlyana.dw b/out/LinuxMintUlyana.dw
index 956cca5..693afd6 100644
--- a/out/LinuxMintUlyana.dw
+++ b/out/LinuxMintUlyana.dw
@@ -2123,6 +2123,21 @@ sudo apt update && sudo apt install signal-desktop
 
 ----
 
+===== Element (cliente de matrix.org) =====
+
+Instalamos con:
+
+<code bash>
+sudo apt install -y wget apt-transport-https
+
+sudo wget -O /usr/share/keyrings/riot-im-archive-keyring.gpg https://packages.riot.im/debian/riot-im-archive-keyring.gpg
+
+echo "deb [signed-by=/usr/share/keyrings/riot-im-archive-keyring.gpg] https://packages.riot.im/debian/ default main" | sudo tee /etc/apt/sources.list.d/riot-im.list
+
+sudo apt update
+
+sudo apt install element-desktop
+</code>
 ===== Lector DNI electrónico =====
 
 Instalamos:
@@ -2133,7 +2148,7 @@ sudo apt-get install pcscd pcsc-tools libccid
 Como root ejecutamos pcsc_scan:
 
 <code>
-root@rasalhague:~# pcsc_scan 
+root@rasalhague:~# pcsc_scan
 PC/SC device scanner
 V 1.4.23 (c) 2001-2011, Ludovic Rousseau <ludovic.rousseau@free.fr>
 Compiled with PC/SC lite version: 1.8.11
@@ -2144,7 +2159,7 @@ Waiting for the first reader...
 Si insertamos el lector veremos algo como esto:
 
 <code>
-root@rasalhague:~# pcsc_scan 
+root@rasalhague:~# pcsc_scan
 PC/SC device scanner
 V 1.4.23 (c) 2001-2011, Ludovic Rousseau <ludovic.rousseau@free.fr>
 Compiled with PC/SC lite version: 1.8.11
@@ -2162,7 +2177,7 @@ Si insertamos un DNI veremos que se lee la información de la tarjeta insertada:
 
 <code>
 Reader 0: C3PO LTC31 v2 (11061005) 00 00
-  Card state: Card inserted, 
+  Card state: Card inserted,
 </code>
 y mas rollo
 
diff --git a/out/LinuxMintUlyana.epub b/out/LinuxMintUlyana.epub
index 249b8ce..d454b22 100644
Binary files a/out/LinuxMintUlyana.epub and b/out/LinuxMintUlyana.epub differ
diff --git a/out/LinuxMintUlyana.mw b/out/LinuxMintUlyana.mw
index df76268..7409d9f 100644
--- a/out/LinuxMintUlyana.mw
+++ b/out/LinuxMintUlyana.mw
@@ -1846,6 +1846,19 @@ sudo apt update &amp;&amp; sudo apt install signal-desktop</pre>
 
 -----
 
+== Element (cliente de matrix.org) ==
+
+Instalamos con:
+
+<source lang="bash">sudo apt install -y wget apt-transport-https
+
+sudo wget -O /usr/share/keyrings/riot-im-archive-keyring.gpg https://packages.riot.im/debian/riot-im-archive-keyring.gpg
+
+echo "deb [signed-by=/usr/share/keyrings/riot-im-archive-keyring.gpg] https://packages.riot.im/debian/ default main" | sudo tee /etc/apt/sources.list.d/riot-im.list
+
+sudo apt update
+
+sudo apt install element-desktop</source>
 == Lector DNI electrónico ==
 
 Instalamos:
@@ -1853,7 +1866,7 @@ Instalamos:
 <pre>sudo apt-get install pcscd pcsc-tools libccid</pre>
 Como root ejecutamos pcsc_scan:
 
-<pre>root@rasalhague:~# pcsc_scan 
+<pre>root@rasalhague:~# pcsc_scan
 PC/SC device scanner
 V 1.4.23 (c) 2001-2011, Ludovic Rousseau &lt;ludovic.rousseau@free.fr&gt;
 Compiled with PC/SC lite version: 1.8.11
@@ -1862,7 +1875,7 @@ Scanning present readers...
 Waiting for the first reader...</pre>
 Si insertamos el lector veremos algo como esto:
 
-<pre>root@rasalhague:~# pcsc_scan 
+<pre>root@rasalhague:~# pcsc_scan
 PC/SC device scanner
 V 1.4.23 (c) 2001-2011, Ludovic Rousseau &lt;ludovic.rousseau@free.fr&gt;
 Compiled with PC/SC lite version: 1.8.11
@@ -1878,7 +1891,7 @@ Reader 0: C3PO LTC31 v2 (11061005) 00 00
 Si insertamos un DNI veremos que se lee la información de la tarjeta insertada:
 
 <pre>Reader 0: C3PO LTC31 v2 (11061005) 00 00
-  Card state: Card inserted, </pre>
+  Card state: Card inserted,</pre>
 y mas rollo
 
 Instalamos ahora el modulo criptográfico desde [https://www.dnielectronico.es/PortalDNIe/PRF1_Cons02.action?pag=REF_1112 este enlace]
diff --git a/out/LinuxMintUlyana.odt b/out/LinuxMintUlyana.odt
index 943dde9..a94e7bb 100644
Binary files a/out/LinuxMintUlyana.odt and b/out/LinuxMintUlyana.odt differ
diff --git a/out/LinuxMintUlyana.pdf b/out/LinuxMintUlyana.pdf
index be97269..5de7df0 100644
Binary files a/out/LinuxMintUlyana.pdf and b/out/LinuxMintUlyana.pdf differ
diff --git a/out/LinuxMintUlyana.tex b/out/LinuxMintUlyana.tex
index b640139..1dbf4c6 100644
--- a/out/LinuxMintUlyana.tex
+++ b/out/LinuxMintUlyana.tex
@@ -3255,6 +3255,26 @@ sudo apt update && sudo apt install signal-desktop
 
 \begin{center}\rule{0.5\linewidth}{0.5pt}\end{center}
 
+\hypertarget{element-cliente-de-matrix.org}{%
+\subsection{Element (cliente de
+matrix.org)}\label{element-cliente-de-matrix.org}}
+
+Instalamos con:
+
+\begin{Shaded}
+\begin{Highlighting}[]
+\FunctionTok{sudo}\NormalTok{ apt install {-}y wget apt{-}transport{-}https}
+
+\FunctionTok{sudo}\NormalTok{ wget {-}O /usr/share/keyrings/riot{-}im{-}archive{-}keyring.gpg https://packages.riot.im/debian/riot{-}im{-}archive{-}keyring.gpg}
+
+\BuiltInTok{echo} \StringTok{"deb [signed{-}by=/usr/share/keyrings/riot{-}im{-}archive{-}keyring.gpg] https://packages.riot.im/debian/ default main"} \KeywordTok{|} \FunctionTok{sudo}\NormalTok{ tee /etc/apt/sources.list.d/riot{-}im.list}
+
+\FunctionTok{sudo}\NormalTok{ apt update}
+
+\FunctionTok{sudo}\NormalTok{ apt install element{-}desktop}
+\end{Highlighting}
+\end{Shaded}
+
 \hypertarget{lector-dni-electruxf3nico}{%
 \subsection{Lector DNI electrónico}\label{lector-dni-electruxf3nico}}
 
@@ -3267,7 +3287,7 @@ sudo apt-get install pcscd pcsc-tools libccid
 Como root ejecutamos pcsc\_scan:
 
 \begin{verbatim}
-root@rasalhague:~# pcsc_scan 
+root@rasalhague:~# pcsc_scan
 PC/SC device scanner
 V 1.4.23 (c) 2001-2011, Ludovic Rousseau <ludovic.rousseau@free.fr>
 Compiled with PC/SC lite version: 1.8.11
@@ -3279,7 +3299,7 @@ Waiting for the first reader...
 Si insertamos el lector veremos algo como esto:
 
 \begin{verbatim}
-root@rasalhague:~# pcsc_scan 
+root@rasalhague:~# pcsc_scan
 PC/SC device scanner
 V 1.4.23 (c) 2001-2011, Ludovic Rousseau <ludovic.rousseau@free.fr>
 Compiled with PC/SC lite version: 1.8.11
@@ -3299,7 +3319,7 @@ insertada:
 
 \begin{verbatim}
 Reader 0: C3PO LTC31 v2 (11061005) 00 00
-  Card state: Card inserted, 
+  Card state: Card inserted,
 \end{verbatim}
 
 y mas rollo
diff --git a/src/600_security.md b/src/600_security.md
index 2715c26..3971c16 100644
--- a/src/600_security.md
+++ b/src/600_security.md
@@ -29,9 +29,9 @@ cat ~/.ssh/id_xxx.pub | ssh user@hostname 'cat >> .ssh/authorized_keys'
 ## Seahorse
 
 Para manejar todas nuestras claves con comodidad:
- 
+
  `sudo apt install seahorse`
- 
+
 ## Conexión a github con claves ssh
 
 Usando este método podemos conectarnos a github sin tener que teclear
@@ -108,6 +108,24 @@ __NOTA__: Parece que no funciona. Lo he instalado via _flatpack_
 
 ------------
 
+## Element (cliente de matrix.org)
+
+Instalamos con:
+
+```bash
+sudo apt install -y wget apt-transport-https
+
+sudo wget -O /usr/share/keyrings/riot-im-archive-keyring.gpg https://packages.riot.im/debian/riot-im-archive-keyring.gpg
+
+echo "deb [signed-by=/usr/share/keyrings/riot-im-archive-keyring.gpg] https://packages.riot.im/debian/ default main" | sudo tee /etc/apt/sources.list.d/riot-im.list
+
+sudo apt update
+
+sudo apt install element-desktop
+```
+
+
+
 ## Lector DNI electrónico
 
 Instalamos:
@@ -119,7 +137,7 @@ sudo apt-get install pcscd pcsc-tools libccid
 Como root ejecutamos pcsc_scan:
 
 ~~~~
-root@rasalhague:~# pcsc_scan 
+root@rasalhague:~# pcsc_scan
 PC/SC device scanner
 V 1.4.23 (c) 2001-2011, Ludovic Rousseau <ludovic.rousseau@free.fr>
 Compiled with PC/SC lite version: 1.8.11
@@ -131,7 +149,7 @@ Waiting for the first reader...
 Si insertamos el lector veremos algo como esto:
 
 ~~~~
-root@rasalhague:~# pcsc_scan 
+root@rasalhague:~# pcsc_scan
 PC/SC device scanner
 V 1.4.23 (c) 2001-2011, Ludovic Rousseau <ludovic.rousseau@free.fr>
 Compiled with PC/SC lite version: 1.8.11
@@ -150,7 +168,7 @@ Si insertamos un DNI veremos que se lee la información de la tarjeta insertada:
 
 ~~~~
 Reader 0: C3PO LTC31 v2 (11061005) 00 00
-  Card state: Card inserted, 
+  Card state: Card inserted,
 ~~~~
 
 y mas rollo