Identity Mixer - overview
Identity Mixer (idemix) is an anonymous credential system developed at IBM Research - Zurich that enables strong authentication and privacy at the same time.
Anonymous credentials overcome this: with such credential a user can selectively reveal any of the attributes contained in the credential without revealing any of their information whatsoever. Thus, anonymous credentials are a key ingredient to protect one's privacy in an electronic world.
With identity mixer, users can obtain from an issuer a credential containing all the information the issuer is ready to attest about them. When a user later wants to prove to a service provider a statement about her, she employs identity mixer to securely transform the issued credential. The transformed credential will only contain the subset of the attested information that she is willing to disclose. The user can apply this transformation as many times as she wants and still none of credentials can linked to each other.