information security; cryptography; python; project

if you are familiar with this field pls contact me for detailed information;

need cryptography expert Implement in Python a secure pseudo-random generator (PRG),by relying on the fact that the Decisional Diffie-Hellman assumption is true.
Research the area of Elliptic-curve cryptography regarding the material posted at the NIST ;
construct a PRG that stretches a small number of bits (at most 521) to 1 MB.
By relying on the fact that the DDH assumption is true you should perform a secure (public) key-exchange.