For the elliptic curve y^2 = x^3+2x+2 mod(23), why is it necessary that 23 is a prime. Why is the elliptic curve y^2 = x^3+2x+2 mod(24) not suitable for elliptic curve cryptography?

  • $\begingroup$ Note: in the linked question the OP thinks that there are composite fields ( that was confusion). See Frédéric Grosshans's answer, not the accepted answer. Also, see Elliptic Curves over Rings?. $\endgroup$ – kelalaka Nov 23 '20 at 8:29
  • $\begingroup$ Closed as you didn't respond to the question if the link answered your question sufficiently. If it didn't, please edit the question and specify why so we can reopen. $\endgroup$ – Maarten Bodewes Nov 23 '20 at 16:54