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	<title>Registration/2FA/ProCon - Revision history</title>
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	<updated>2026-05-13T23:54:20Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
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	<entry>
		<id>https://wiki.bwhpc.de/wiki/index.php?title=Registration/2FA/ProCon&amp;diff=12541&amp;oldid=prev</id>
		<title>M Janczyk: Created page with &quot;= Pros and Cons of the different Solutions =  This section briefly describes the differences between the above solutions.  == Mobile App ==  This sections describes the pros a...&quot;</title>
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		<updated>2024-01-26T13:50:47Z</updated>

		<summary type="html">&lt;p&gt;Created page with &amp;quot;= Pros and Cons of the different Solutions =  This section briefly describes the differences between the above solutions.  == Mobile App ==  This sections describes the pros a...&amp;quot;&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;= Pros and Cons of the different Solutions =&lt;br /&gt;
&lt;br /&gt;
This section briefly describes the differences between the above solutions.&lt;br /&gt;
&lt;br /&gt;
== Mobile App ==&lt;br /&gt;
&lt;br /&gt;
This sections describes the pros and cons of an app on your mobile device (phone or tablet).&lt;br /&gt;
&lt;br /&gt;
&amp;#039;&amp;#039;&amp;#039;Pros:&amp;#039;&amp;#039;&amp;#039;&lt;br /&gt;
* Can be used at no extra cost if you have a mobile device.&lt;br /&gt;
* When using your cell phone, you always have the second factor at your fingertips.&lt;br /&gt;
&lt;br /&gt;
&amp;#039;&amp;#039;&amp;#039;Cons:&amp;#039;&amp;#039;&amp;#039;&lt;br /&gt;
* You need a mobile device.&lt;br /&gt;
* If your device is lost or damaged, you will lose your second factor. (&amp;#039;&amp;#039;Some services offer cloud synchronization, but you usually need an account and Google Authenticator does not encrypt your TOTP secret keys when storing them in the cloud.&amp;#039;&amp;#039;)&lt;br /&gt;
&lt;br /&gt;
== Yubico OTP ==&lt;br /&gt;
&lt;br /&gt;
This sections describes the pros and cons of Yubico OTP. For Yubico OTP to work, you need a Yubikey with Yubico OTP support.&lt;br /&gt;
&lt;br /&gt;
&amp;#039;&amp;#039;&amp;#039;Pros:&amp;#039;&amp;#039;&amp;#039;&lt;br /&gt;
* You do not need a mobile device. All you need is a USB port.&lt;br /&gt;
* Simple and fast: The Yubikeys are preconfigured for Yubico OTP. All you need to do is touch the metal plate on the device when prompted.&lt;br /&gt;
&lt;br /&gt;
&amp;#039;&amp;#039;&amp;#039;Cons:&amp;#039;&amp;#039;&amp;#039;&lt;br /&gt;
* You have to spend money on a Yubikey.&lt;br /&gt;
* If you lose the device, you will lose the second factor (it is recommended to buy at least two Yubikeys).&lt;br /&gt;
* If you do not have your Yubikey with you, you cannot log in to the clusters.&lt;br /&gt;
* In bwHPC, the Yubicloud is used to synchronize the Yubico OTP keys (third-party provider).&lt;br /&gt;
&lt;br /&gt;
== Yubikey OATH TOTP ==&lt;br /&gt;
&lt;br /&gt;
This sections describes the pros and cons of Yubikey OATH TOTP. For Yubikey OATH TOTP to work, you need a Yubikey with OATH TOTP support. This solution is similar to the one for mobile apps, but an external pin generator is used.&lt;br /&gt;
&lt;br /&gt;
&amp;#039;&amp;#039;&amp;#039;Pros:&amp;#039;&amp;#039;&amp;#039;&lt;br /&gt;
* You do not need a mobile device. All you need is a USB port.&lt;br /&gt;
* You can use multiple devices such as phones and tablets (via USB, Lightning or NFC) or even your computer(s).&lt;br /&gt;
* Since the TOTP is calculated on the Yubikey and the computer/mobile device is only used for displaying the TOTP and time synchronization, you can use the same device you use for login.&lt;br /&gt;
&lt;br /&gt;
&amp;#039;&amp;#039;&amp;#039;Cons:&amp;#039;&amp;#039;&amp;#039;&lt;br /&gt;
* You have to spend money on a Yubikey.&lt;br /&gt;
* If you lose the device, you will lose the second factor (it is recommended to buy at least two Yubikeys).&lt;br /&gt;
* If you do not have your Yubikey with you, you cannot log in to the clusters.&lt;/div&gt;</summary>
		<author><name>M Janczyk</name></author>
	</entry>
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