A K Out of K+1 VisualCryptography Scheme

Naor and Shamir proposed an optimal (k, k） visual cryptography scheme (VCS). Droste extended the (k, k) scheme to (k, n) scheme. Based on properties of 0 and 1’s permutations of basic matrices, we use basic matrices of the (k, k) scheme to constrict basic matrices of (k, k+1) cheme.