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Is there a robust Identity-Based Digital Signature algorithm?

cn flag

I'm looking for a IB-DS algorithm in the web. I found this one (if you know some other let me know). But I cannot figure out what the "identity" is. Better: I don't know if, in the section Key Generation, the $x$ is the identity. E.g. $x = H(EncodedBiometrics)$ (biometrics or any information publicly and inherently linked to the user) for some CRHF $H$. Can you confirm this or am I completely misunderstanding such a scheme (not necessairly this particular scheme but a generic IB-DS scheme)? I hope I've been clear

mangohost

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