Steganography and steganalysis in cryminology [tryb ... - cygnus
Steganography and steganalysis in cryminology [tryb ... - cygnus
Steganography and steganalysis in cryminology [tryb ... - cygnus
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Timestamp <strong>in</strong> electric hum<br />
European electricity network<br />
local fluctuations <strong>in</strong> the current frequency (around expected value of<br />
50Hz)<br />
the frequency is the function of time <strong>and</strong> equal on a given area<br />
a correlation is observed <strong>in</strong> the fluctuations <strong>in</strong> all union area (Union<br />
for the Coord<strong>in</strong>ation of the Transmission of Electricity)<br />
one can estimate the time of audio record<strong>in</strong>g, because an additional<br />
signal is added due to the frequency fluctuations<br />
PSE-operators store values of frequency <strong>in</strong> data bases s<strong>in</strong>ce 1997<br />
Thus an <strong>in</strong>vestigator can detect if a given evidence audio has been<br />
manipulated, reassembled or partially replaced
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