Update index

cards.md

@@ -73,6 +73,7 @@ order: -1
 		<h3>Integrity</h3>
 		<ul>
 			<li><a href="external/integrity/checksum">Ensuring Integrity of Data Files with Checksums</a></li>
+			<li><a href="external/integrity/encryption/cloud">Data upload to cloud</a></li>
 			<li><a href="external/integrity/encryption/disk">Encrypting the Startup Disk for Your Laptop/Desktop</a></li>
 			<li><a href="external/integrity/encryption/file">Encrypting Files and Folders</a></li>
 			<li><a href="external/integrity/naming">Naming files</a></li>