[messaging] Random questions, kind of

[Michael Rogers]

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On 22/12/14 05:48, David Gil wrote:
> 1. Is there a good alternative to BLS or RSA-{OAEP/PKCSv15/FDH} 
> signatures for a verifiable unpredictable function?

Excuse (or feel free to ignore) the noobish question, but what
distinguishes a verifiable unpredictable function from a generic
digital signature function?

> 2. Does anyone know of any common objects that have sufficiently 
> stable, but unpredictable features (over multi-year time periods) 
> that photographing them -- and, e.g., fuzzy sketching -- could
> allow using them as human-scale (non-biometric) "PUF"s?

Glitter nail polish has been suggested for tamper-detection:
http://www.wired.com/2013/12/better-data-security-nail-polish/

> 3. Does anyone have references to any existing schemes for 
> transferring a secret/fingerprint using human-audible sound? (I'm 
> aware of the creepy high-frequency stuff.)

https://www.ics.uci.edu/~goodrich/pubs/loudandclear.pdf
https://sparrow.ece.cmu.edu/group/pub/MVSec_CMUCyLab14006.pdf
https://sparrow.ece.cmu.edu/group/pub/junwisec14.pdf

The last two come from a research group at CMU that's produced lots of
interesting key exchange ideas, most recently SafeSlinger.

Cheers,
Michael
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