Submission + - Startup Uses Cryptography to Protect Identities (wired.com)
I Don't Believe in Imaginary Property writes: "Wired has a story about a startup called U-Prove that has a cryptographic scheme to protect privacy. It works by using secure multi-party computation, which allows you to disclose facts to another party without revealing any more than you have to, and making the knowledge useless for anything other than the transaction at hand. One example is the "Millionaire's Problem" where Alice and Bob want to know who has more money without either of them telling anyone exactly how much they have. They also have a whitepaper (PDF) that goes into more detail."