Editing Tempest (codename) (section)

==RED/BLACK separation==
TEMPEST standards require "[[red/black concept|RED/BLACK]] separation", i.e., maintaining distance or installing shielding between circuits and equipment used to handle [[plaintext]] classified or sensitive information that is not encrypted (RED) and secured circuits and equipment (BLACK), the latter including those carrying encrypted signals. Manufacture of TEMPEST-approved equipment must be done under careful quality control to ensure that additional units are built exactly the same as the units that were tested. Changing even a single wire can invalidate the tests.{{citation needed|date=February 2022}}