In RSA, the choice of the public key component e is often one of the following five numbers: 3, 5, 17, 257, or 65537. Why?

Question

In RSA, the choice of the public key component  e  is often one of the following five numbers: 3, 5, 17, 257, or 65537. Why?

Accepted Answer

Because they make encryption faster.

Answer

These are first five prime numbers, any other prime number would be larger.

Answer

Because these numbers have a common factor with (p-1)(q-1).

Answer

Because they are all prime numbers

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