idemix (identity mixer) is an anonymous credential system (or pseudonym system) that we are developing here. It consists of

• Theoretical results, i.e., cryptographic algorithms and protocols to realize an efficient anonymous credential system (see publications below).
• A prototype implementation of the cryptographic protocols, some basic applications logic on the server and the client side, a wallet for users to manage (store, show, and obtain) their credentials, and some demo applications. This prototype has been used by several Universities for their own research such as anonymous access control, identity management, privacy in healh-care, and e-government, to name just a few. idemix will also be used in the FP6 integrated project PRIME (Privacy and Identity Management for Europe). If you are interested in using our prototype for your own research please contact us at idemix (at) zurich.ibm.com.

Finally, idemix has been the basis of the Direct Anonymous Attestation (DAA) protocol that is included in the Trusted Computing Group's specification of the Trusted Platform Module (TPM) v1.2. DAA allows a TPM-equipped platform to convince another platform that it actually contains a genuine TPM in an anonymous way, i.e., without revealing any other information about itself.