I want to make a DH Key exchange with a PC and an Arduino. I want to generate a Prime p and a Base g on the Arduino that should be 2048 Bits long.
How to generate g and p for DH safely on Arduino Nano
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You don't generate
pandg.They are specified by the Diffie-Hellman group choice.
You only need to generate a random integer in the range of zero to the group mod-1.