Yubico Forum

Having a similar issue as this here viewtopic.php?f=2&t=397

I started to encrypt my system with the Yubikey static password + a password I know and I get invalid password I have removed the truecrypt loader after the test failed and re-tried 3 or 4 times. I programmed the Yubikey 2.0 to have a static password and use it for my password manager so I know its working. The only thing I can think of is that the yubikey is spitting out a different static password for some reason. The total password is under 64 characters so that should not be the problem... anyone have any idea what is going on?

We would appreciate if you can use the "output speed throttling" feature of the YubiKey to slow down the character output from the YubiKey and try again. You need to use the YubiKey configuration utility to slow down the character output rate. The YubiKey configuration utility and the user guide can be downloaded from the following link:

http://www.yubico.com/developers/personalization/

Please note that you need to reprogram your YubiKey in order to slow down the character output rate.

Sorry for the delay needed to find time to decrypt/re-encrypt the drive and change the accounts that were using my static password etc..... I used the utility and added both delays for a total of 60ms and its still stating incorrect password...

After resetting the yubikey and truecrypt a few more times I found that I cannot have "Mix upper and lower case" check... wish that was in the documentation.

Glad I read this post, as I was planning on using this to encrypt an entire disk. The more I read about these "issues" the more I think that this device places restrictive parameters on its use. SIMPLY relying on the "length" of a password, rather than its "complexity" in my honest opinion is no way to implement a secure environment. When your limited to ONLY all lower (or) upper case it makes your application more susceptible brute force tools.....Just like the lack of choosing my own static passwords, I am yet once again very disappointed.

Just to try to understand what goes wrong here - does the key generate an okay password at the time of configuration, i.e. when you're in the OS ? I assume that's the case.

Any feeling that there is a timing issue - any difference if the throttling is set ?

The problem of "Mix upper and lower case" not working - can you please give a hint here ? Does it not work at all or not within the Truecrypt environment ?

Regarding password complexity, I've made a post here viewtopic.php?f=6&t=368

With the best regards,

JakobE
Hardware- and firmware guy @ Yubico

What are you talking about? You can certainly have upper and lower case characters. And I've been using my own static passwords in my testing (which, incidentally, are mixed case).

See page 27 in the Personalization tool manual:
http://www.yubico.com/files/YubiKey_Con ... -12-03.pdf

Select "Scan Key Mode" and enter your custom password in the "Scan code input" field. Not a user friendly name but I kind of understand why. Remember, the Yubikey simulates a keyboard... scan codes aren't the same across countries/keyboards/platforms. That was why Yubikey came up with modhex:
viewtopic.php?f=6&t=96

Works fine (at least with the 2.1 key I have here).

-jr

Can you elaborate what you mean by "cannot"?

If you open up a text editor (e.g. Notepad, Vi) and touch your Yubikey several times in a row (wait for the light to come back on in between touches), are the keys generated consistent (they should be if you are activating your static configuration)?

Are you aware that the Yubikey (at least it its a 2.0 or 2.1 one) has two password profiles? Perhaps you accidentally wrote the configuration to the wrong one? Or perhaps you were activating (with a shorter versus longer "touch") the incorrect profile?