Fundamentally a password is something that can have it's value rapidly drop
to zero without warning. It doesn't wear out.
on password expiration
ENF [Electrical Network Frequency analysis] relies on frequency variations
in the electricity supplied by the National Grid. Digital devices such as
CCTV recorders, telephone recorders and camcorders that are plugged in to
or located near the mains pick up these deviations in the power supply,
which are caused by peaks and troughs in demand. Battery-powered devices
are not immune to to ENF analysis, as grid frequency variations can be
induced in their recordings from a distance.
reports on a new forensic technique
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