how can i develope RSA encryption algoritm?

Question

c++ code and speed of RSA or security problem

Answer 1

You can obtain existing RSA algorithms and modify them to make a different version, if you want to from scratch, good luck. Find the requirements for the RSA algorithm and code it.

look at this for insight
http://www.di-mgt.com.au/rsa_alg.html

If the math or logic is too difficult - start small, with ceasar cipher's and work your way up.

This helped me http://www.cacr.math.uwaterloo.ca/hac/ and this is also an awesome book
Applied Cryptography: Protocols, Algorithms, and Source Code in C
by Bruce Schneier (must have for any interested in cryptography)