Please see the file below about encoding a birthday.
For example the birthday is 250692, how to calculate?
Exercise 2: Encode your date of birth (format DDMMYY) using the public key:
n = 536813567
a = 7582663
(Use the correspondence 0 <-> 0, 1 <-> 1, ..., 9 <-> 9 and work in base 10 to encode this message.)© BrainMass Inc. brainmass.com October 10, 2019, 7:51 am ad1c9bdddf
The theory of RSA encryption states the following
Choose two large numbers p and q and compute n = p*q
Compute phi = (p-1)*(q-1)
Choose a prime number a that is coprime with phi
Compute the multiplicative inverse of phi w.r.t. i.e. d = ...
The writeup shows an illustrative numerical calculation of data encryption and decryption using the RSA method by utilizing a public and private key.