# Extended Visual Cryptography Schemes

October, 2005: Extended Visual Cryptography Schemes

(a)

+-+-+-+     +-+-+-+     +-+-+-+
|1|1|1|     |1|1|0|     |1|1|1|
+-+-+-+     +-+-+-+     +-+-+-+
|1|1|0|  +  |1|1|0|  =  |1|1|0|
+-+-+-+     +-+-+-+     +-+-+-+
|0|0|0|     |0|0|0|     |0|0|0|
+-+-+-+     +-+-+-+     +-+-+-+
T1=4        T2=5        Tt=4

(b)
+-+-+-+     +-+-+-+     +-+-+-+
|1|1|1|     |0|1|1|     |1|1|1|
+-+-+-+     +-+-+-+     +-+-+-+
|1|1|0|  +  |0|1|1|  =  |1|1|1|
+-+-+-+     +-+-+-+     +-+-+-+
|0|0|0|     |0|0|0|     |0|0|0|
+-+-+-+     +-+-+-+     +-+-+-+
T1=4        T2=5        Tt=3

(c)

+-+-+-+     +-+-+-+     +-+-+-+
|1|1|1|     |0|1|1|     |0|0|1|
+-+-+-+     +-+-+-+     +-+-+-+
|1|1|1|  +  |1|1|1| <>  |0|1|1|
+-+-+-+     +-+-+-+     +-+-+-+
|1|0|0|     |0|1|1|     |0|0|0|
+-+-+-+     +-+-+-+     +-+-+-+
T1=2        T2=2        Tt=6

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