Patent ID: 7269277

Claim:
A passive identification system, comprising: a body part input means for dynamically generating an information signal impressed with characteristics of a body part generated directly from the body part and not read from other inputs, wherein the information signal includes one or more generation errors based on variances of the body part; an index generation means for dynamically generating one or more indices from the information signal, wherein the one or more indices are generated by processing the information signal by selecting only a portion of the information signal such that generation errors based on variances of the body part are determined to be within a pre-determined error level within the selected portion of the information signal and generating the one or more indices using only the selected portion of the information signal, wherein the generated information signal and the one or more dynamically generated indices are not stored in the passive identification system and the one or more dynamically generated indices reveal no information about the identity of body part thereby providing perfect secrecy; and a linking means to link via a trusted link at least one of the dynamically generated indices to an identity for the body part stored in a secure database.