Network security

Question

 here e and z should be relative prime .. But is there any bound on e  i.e it should be minimum.... because 43 satisfies it.. but ans is 3

Comments

1<= e <= phi(n)

and e should be coprime with phi(n)

and ed = 1 mod phi(n)

These three conditions are sufficient to calculate e as 3.

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oh yes i skipped 1<= e <= z 

thank u Sir :)