The Proposed Hierarchical (k, k) VSS Scheme (The basic principle of our hierarchical scheme)

shared

secret picture

Layer 1 :

(k1, k1) Scheme

• A Two-Layer (k1k2, k1k2) VSS scheme with the share size 2k1 -1„e2k2 -1 :

1

1

2

k2

1

2

k2

2

1

2

k2

k1

k1 „e k2 Shadows

Layer 2 :

(k2, k2) Scheme

the original shared picture of a (k1, k1) scheme

the shadow of a (k1, k1) scheme and also a new shared picture of a (k2, k2) scheme

the shadow of a (k1k2, k1k2) scheme

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