The value of information. How large should the primes p and q be in the RSA coding scheme? Of course, if you pick ridiculously large ones, then the product of the two would be impossible to factor from a practical point of view. Do you really need the primes to be that large? What if you’re just sending a little love message to a special friend? Do you think the CIA will want to break your code? What determines the size of the primes you need?
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The Heart of Mathematics: An Invitation to Effective Thinking
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