title: encryption of a letter with RSA algorithm
body: <p>I've been given (17,3233) and I need to encrypt the letter 'Z' using ascii number. (Z = 90)
  90^17 mod3233 = 1668 and that would just work. But I want to know if there is a way that i can just send a single char instead of the integer 1668 and still make it work.</p>