Algorithm 1. Secret Sharing

Input: QR code Q, number of iterations i Output: Secret shares S1, S2 & S3 Method:   1. Apply Arnold Transform on Q    QA ← Arnold Transform(Q,i)   2. Find the rank of QA    k1←rank(QA)   3. Factor QA into base and coefficient matrices    [W,H]←NMF(QA,k1)   4. Find the rank of H    k2←rank(H)   5. Factor H into base and coefficient matrices    [H1, H2]←NMF(QA,k2)   6. Construct the Secret Shares      a. S1←W      b. S2← H1      c. S3← H2