First a bit of background. RSA is this:
p,q primes
N=pq
e=prime that is not a factor of p-1 or q-1 and not equal to p or q
d = e^-1 mod (p-1)(q-1)
public key = {e,N}
private key = {d, N}
Encryption = X = M^e mod N
Decryption = M = X^d mod N
The e-value you see in the call is the value e above. The recommendation of
using 3 or 65537 is a speed decision, and I would definitely recommend 65537
over 3 for security reasons.
Joe
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