Cryptography Stack Exchange
Cryptography Stack Exchange

Questions tagged [u-prove]

U-Prove is a Crypto SDK was developed by Microsoft to support experimentation with the foundational features of the U-Prove technology. It is made available under the Apache 2.0 open-source license, with patent rights granted under the OSP.

U-Prove is a Crypto SDK was developed by Microsoft to support experimentation with the foundational features of the U-Prove technology. It is made available under the Apache 2.0 open-source license, with patent rights granted under the OSP.

For more information about the U-Prove technology, visit http://www.microsoft.com/u-prove

6 questions
4
votes
1 answer

How to verify a trusted Issuer in U-Prove

I work with U-Prove. In U-Prove they talk about a trusted Issuer, but I never saw how the trust is verified. The trust is essential, because the Verifier wants to know if the token was created with a trusted Issuer or not. The U-Prove Cryptographic…
lmb1
  • 43
  • 4
3
votes
0 answers

Interactive proof of possession of a signed message

Suppose Alice has a verifiable (message, signature) pair from Cedric, who would not cooperate and routinely uses an algo (ecdsa, eddsa, rsa, or insert yours here) to sign messages. Alice wants to interactively prove to Bob she has that (message,…
wick
  • 151
  • 5
2
votes
1 answer

Can Secp 256 K1 curves "map" to a value on FIPS 186-3 or P-256?

I'm looking at Secp 256K1 vs UProve's FIPS 186-3 or P-256 implementation. Is there any relationship between the curves such that I can consistently "map" or "project" values from one curve to another? Is this a good idea? (What faults could crop…
makerofthings7
  • 2,631
  • 1
  • 22
  • 37
1
vote
1 answer

What type of groups does Microsoft's U-Prove use (Schnorr... etc?)

I'm trying to learn more about the Subgroups implementation of Microsoft UProve. I'm unsure if they are Schnorr Groups or use a different foundation? Can anyone point me to the technical reading required to understand the implementation? …
makerofthings7
  • 2,631
  • 1
  • 22
  • 37
1
vote
1 answer

Revocation in Idemix and U-prove

I read some materials about MS u-prove and IBM Idemix. But according to these materials, the opinion about revocation is different. Some materials say that u-prove and idemix do not provide revocation, but others say that they provide. I tried to…
takita
  • 509
  • 2
  • 8
1
vote
2 answers

Can a zero knowledge proof (or MAC) be generated from human-typable input?

Edit: My goal is to create a voting scheme that doesn't require a lot of crypto infrastructure to be deployed on the client side. Smartcards, and tokens are impractical for these purposes. I envision a user typing a "code" into a web browser…
makerofthings7
  • 2,631
  • 1
  • 22
  • 37