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+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
+<title>Handbook placeholder page</title>
+<link rel="stylesheet" type="text/css" href="../../css/main2.css" />
+</head>
+<body>
+<h2 id="tophead">CUCC Expedition Handbook</h2>
+
+<h1>Cryptographic Key Exchange</h1>
+<p>As of the server move in spring 2019 none of us can ssh into the expo server unless we set up ssh keys which identify 
+the specific machine we are logging in from.
+
+<p>You will need to <a href="https://www.ssh.com/ssh/keygen/">ssh-keygen</a> a key on your device, email the public key to someone who already has ssh access (Wookey, Paul Fox, Philip Sargent, Sam Wenham..)
+and follow their instructions.
+
+<p>If you are already a sohpisticated user of these things, you might like to look at 
+<a href="https://dev.to/shosta/how-to-setup-multiple-ssh-keys-for-multiple-github-bitbucket-accounts-2ji0">
+How to setup multiple ssh keys</a>.
+
+<hr />
+
+<div id="menu">
+<ul id="links">
+<li><a href="../index.htm">Handbook</a>
+
+<li><a href="../../infodx.htm">Main index</a></li>
+</ul>
+</div>
+</body>
+</html>
diff --git a/handbook/keyexchange.html b/handbook/keyexchange.html
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-<html>
-<head>
-<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
-<title>Handbook placeholder page</title>
-<link rel="stylesheet" type="text/css" href="../css/main2.css" />
-</head>
-<body>
-<h2 id="tophead">CUCC Expedition Handbook</h2>
-
-<h1>Placeholder</h1>
-<p>This is not the page you are looking for.
-<p>This will be replaced with the information you want as soon as someone gets around to writing it. Why not find out how to do this yourself ?
-
-<hr />
-
-<div id="menu">
-<ul id="links">
-<li><a href="index.htm">Expedition Handbook</a>
-<ul>
-	<li><a href="rig/rigit.html">Rigging guide</a></li>
-	<li><a href="survey/index.htm">Surveying guide</a></li>
-	<li><a href="look4.htm">Prospecting guide</a></li>
-	<li><a href="rescue.htm">Rescue guide</a></li>
-</ul></li>
-<li><a href="../infodx.htm">Main index</a></li>
-
-<li><a href="../index.htm">Expo Home</a></li>
-<li><a href="../../index.htm">CUCC Home</a></li>
-</ul>
-</div>
-</body>
-</html>
diff --git a/handbook/upload-expert.html b/handbook/upload-expert.html
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+++ b/handbook/upload-expert.html
@@ -18,7 +18,7 @@ to the server. This is worse than it was as the password is now sent in clear.
 
 <p>So it is important that the ordinary ftp access is restricted to the /uploads/ folder tree.
 
-See <a href="keyexchange.html">key exchange instructions</a> for how to arrange with an admin for this to be done for your device.
+See <a href="computing/keyexchange.html">key exchange instructions</a> for how to arrange with an admin for this to be done for your device.
 
 
 <h3>Using scp - requires key exchange for the device</h3>