Patent ID: 7426272

Claim:
An instrumentation privacy apparatus, comprising: a central module; an outlying module; wherein the central module is operable for transmitting a first synchronous packet of data to the outlying module and the outlying module is operable for receiving the first synchronous packet of data from the central module; wherein the outlying module is operable for transmitting a second synchronous packet of data to the central module and the central module is operable for receiving the second synchronous packet of data from the outlying module; and a common keytext generator operable for according privacy to both the first synchronous packet of data and the second synchronous packet of data; the common keytext generator providing an m-bit shift register having an m-bit sequence that is greater than a keytext frame length, the common keytext generator comprising a shrinking generator; the shrinking generator comprising an m-bit binary vector and an n-bit binary vector.