[cryptography] uprove digital credentials

Adam Back adam at cypherspace.org
Thu Mar 18 14:49:53 EDT 2010

I read the crypto spec doc and if one can implement that one alone it
is very light - just specifies serializations for hashing.  You can
even choose the hash so its really at the level of like a DSA spec or
something.  And lots of options are mentioned hashing or not the
attributes etc.


On Thu, Mar 18, 2010 at 1:57 PM, Adam Back <adam at cypherspace.org> wrote:
> Hi
> I had a read of the OSP but I am not that familiar with the concept.
> Does it mean that one could use the specification for any application:
> eg use the serialization given for ecash, anonymous tokens of some
> kind - something that is not directly an envisaged use case.
> And would it be allowed to deviate from the serialization eg say you
> needed to use elliptic curve, or a compact serialization for
> convenience would that non-conformance to spec prevent one benefiting
> from the OSP?  (Not that typically following the serialization should
> be an issue for most applications I would presume).
> Adam
> On Thu, Mar 18, 2010 at 5:48 AM, Greg Thompson <gregth at gmail.com> wrote:
>> On Mar 17, 2010,  4:03 AM, Adam Back wrote:
>> Now I have to say I never read exactly what OSP allows but I think
>> people are viewing this as a positive thing, and if people get to use
>> the patents for privacy related apps that is cool.
>> Hi Adam,
>> I took no part in the legal side of things, but our intent (and by "our" I'm
>> not speaking as a representative of Microsoft) was that anyone could use the
>> portions of the patents needed to implement the crypto spec
>> (see http://www.microsoft.com/u-prove) for any purpose.  The spec details
>> one issuance protocol and the basic selective disclosure presentation
>> protocol.  We would love to receive feedback (at uprovectp at microsoft.com)
>> from the community regarding the spec and the protocols we've opened up.
>> Cheers,
>> Greg
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