1.

On multiplying (x6+x4+x2+x+1) by (x7+x+1) in GF(28) with irreducible polynomial (x8 + x4 + x3 + x + 1) we get

A. x<sup>7</sup>+x<sup>6</sup>+ x<sup>3</sup>+x<sup>2</sup>+1
B. x<sup>6</sup>+x<sup>5</sup>+ x<sup>2</sup>+x+1
C. x<sup>7</sup>+x<sup>6</sup>+1
D. x<sup>7</sup>+x<sup>6</sup>+x+1
Answer» D. x<sup>7</sup>+x<sup>6</sup>+x+1


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