|Choosing appropriate hex values for the TokenID
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|Author:||tpohl [ Thu Apr 30, 2009 7:42 pm ]|
|Post subject:||Choosing appropriate hex values for the TokenID|
I'm working on a web-based approach for reprogramming the yubikey through a web interface using the sample html page example from the personalization tool. I have it programming the keys just fine, but I find that there seems to be a "secret" in choosing appropriate hex values for the TokenID.
Here are 2 examples 1 works and 1 does not:
TokenID (in hex): 22255f563465
converted to base64: IiVfVjRl
TokenID (in hex): b257e81803c8
converted to base64: ALJX6BgDyA==
Are there rules around hex values that aren't acceptable for the token id? I was simply taking the first 12 characters of an AES key in hex and using that for a token id and a second AES key as the private key, but it appears my plan won't work unless I get a handle on appropriate values of the token id! :)
|Author:||Jakob [ Mon May 04, 2009 12:25 am ]|
|Post subject:||Re: Choosing appropriate hex values for the TokenID|
I guess the "Token ID" refers to what is also known as the public ID... ?
The OTP as it goes today is 44 modhex characters. It is made up of a public ID (= static information) that is by default 6 bytes (= 12 modhex characters) and an OTP (= dynamic information) that is 16 bytes (= 32 modhex characters). This means that the concatinated OTP from a default deployed Yubikey is 12 + 32 = 44 characters, where the public ID part is being sent first.
Please let me know if this brings any light into the question.
Hardware- and firmware guy @ Yubico
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