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The main actual deployed usage of the technique is in TPM's for direct anonymous attestation. http://en.wikipedia.org/wiki/Direct_Anonymous_Attestation
IBM explains their project here http://www.zurich.ibm.com/idemix/details.html
The original academic work its based on is this http://cs.brown.edu/~anna/papers/cl01a.pdf
A different(and older) technique which, by my understanding, is mainly useful for smart cards, is deployed in a prototype system from microsoft : http://research.microsoft.com/en-us/projects/u-prove/
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The main actual deployed usage of the technique is in TPM's for direct anonymous attestation. http://en.wikipedia.org/wiki/Direct_Anonymous_Attestation
IBM explains their project here http://www.zurich.ibm.com/idemix/details.html
The original academic work its based on is this http://cs.brown.edu/~anna/papers/cl01a.pdf
A different(and older) technique which, by my understanding, is mainly useful for smart cards, is deployed in a prototype system from microsoft : http://research.microsoft.com/en-us/projects/u-prove/