cryptography using multinacci block matrices

In this paper, we propose public key cryptography using recursive block matrices involving generalized fibonacci numbers over a finite field $mathbb{z}_{p}$. for this, we define multinacci block matrices, a kind of upper triangular matrix involving multinacci matrices at diagonal places and give some of its algebraic properties. moreover, we set up a method for key element agreement at end users, which makes cryptography more efficient. the proposed cryptography comes with a large key space and its security relies on the discrete logarithm problem (dlp).