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An Authentication Example

Fig.1 : Shadow 1

Fig.2 : Shadow 2

Fig.3 : Shadow 1 + Shadow 2

Fig.1

Fig.3

Fig.2

Code Book :

SBBB =

SBWB =

SWBB =

SWW B =

SBBW =

SBWW =

SWBW =

SWW W =

SWBB : Shadow 1 = White

Shadow 2 = Black

Shadow 1 + Shadow 2 = Black

Shadow 1

Shadow 2

+

=

Shadow 1 + Shadow 2

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