Introduction - If you have any usage issues, please Google them yourself
Description
eulerphi(p) computes the Euler s Totient Function of p where p is a positive integer and eulerphi(1)=1 by definition.
invmodn(x,p) computes the inverse modulo of x under p using repeated multiplication technique.This function can work for a long range of numbers.
CRT(r,p) computes the value of the system of equations that is described in the summary.
invmodn funtion comes in handy for use in RSA algorithm.