Polynomial arithmetic

Polynomial arithmetic

Polynomial arithmetic includes basic mathematical operations such as addition, subtraction, and multiplication. These operations are defined naturally as if the variable x was an element of S. Division is defined similarly, but requires that S be a field. Examples of fields include rational numbers, Z_p for p prime, and real numbers. The set of all integers is not a field and does not support polynomial division.

Addition and subtraction

Addition and subtraction are performed by adding or subtracting corresponding coefficients. If

: f(x) = sum_{i=0}^n a_ix^i; g(x) = sum_{i=0}^m b_ix^i

then addition is defined as

: f(x)+g(x)= sum_{i=0}^m (a_i+b_i)x^i + sum_{i=0}^n a_ix^i.

Multiplication

Multiplication is performed much the same way as addition and subtraction, but instead by multiplying the corresponding coefficients. If f(x) = sum_{i=0}^n a_ix^i; g(x) = sum_{i=0}^m b_ix^i then multiplication is defined as f(x) imes g(x)=sum_{i=0}^{n+m} c_ix^i where c_k=a_0b_k+a_1b_{k-1}+cdots+a_{k-1}b_1+a_kb_0. Note that we treat a_i as zero for i>m and that the degree of the product is equal to the sum of the degrees to the two polynomials.

References

* Stallings, William; : "Cryptography And Network Security: Principles and Practice", pages 121-126. Prentice Hall, 1999.


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