Patent ID: 7822689
Filing Date: 2010-10-26
Classification: G06F,G06Q,H04L

Abstract:
1. An improved method of maintaining privacy for transactions employing a user device having a security module, wherein the improvement comprises the steps of: sending, by an issuer computer, an endorsement key to a user device, wherein the endorsement key is unique to the user device; computing a hash of the endorsement key by the issuer computer and sending by the issuer computer, a first set of attestation values to the user device, wherein the first set of attestation values comprises the hash; receiving, by a privacy computer, a first set of signature values from the user device, wherein the first set of signature values is a function of the first set of attestation values; providing, by the privacy computer, a second set of attestation values to the user device, wherein the second set of attestation values are a function of the hash receiving, by the verification computer the first set of signature values and a second set of signature values from the user device, wherein the second set of signature values is a function of the hash; verifying, by the verification computer, that the first set of signature values and the second set of signature values are based on the hash; and and based on the verifying step, providing, by the verification computer, access to a service, data, or information to the user device.