New proposed methods for coding information using direct product of symmetricmatrices and contraction functions with new properties of hermitian matrices

الملخص EN

In this paper, two separately methods were suggested for coding information .The first method was introduced using the directness of symmetric matrices .The contraction function was used for introducing the second method .For more complexity the presented two methods were gathered in one method .

And it is proved that the direct product preserves the property of Hermitian positive definite matrices .