
The method to Subtract, Multiply and Divide two Field Numbers over the Extended Galois Field GF(pq) is a well needed solution to the field of Discrete Mathematics as well as in Cryptology. In this paper the addition of two Galois Field Numbers over Extended Galois Field GF(pq) has been reviewed and Subtraction, Multiplication and Division of two Galois Field Number over Extended Galois Field GF(pq) has been defined.