On 2011-02-16 12:28 PM, Jeffrey Walton wrote:
Hi James,

Off topic:

I am pretty sure I it can be done in half a round trip using pairing
based cryptography, that is to say, a bilinear map,
Are you aware of any C++ implementations of PBC? I have a need, but
have only found Ben Lynn's stuff over at Standford. Last time I looked
at it, I felt it best to pass on the implementation.

All I know is the PBC stuff. What do you think is wrong with it, other than that it assumes it is running on a completely secure machine, which is hard to avoid?

I have not gotten sufficiently deeply into it, nor am I sufficiently good at cryptography, to criticize it.
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