public string Encrypt(string plainText)
{
string cipherText = plainText;
CaesarCipher caesarCipher = new CaesarCipher();
caesarCipher.SetKey(CAESAR_CIPHER_KEY);
cipherText = caesarCipher.Encrypt(cipherText);
AffineCipher affineCipher = new AffineCipher();
affineCipher.SetKeys(new int[] { AFFINE_CIPHER_KEY_A, AFFINE_CIPHER_KEY_B });
cipherText = affineCipher.Encrypt(cipherText);
SimpleSubstitutionCipher simpleSubstitutionCipher = new SimpleSubstitutionCipher();
simpleSubstitutionCipher.SetKey(SIMPLE_SUBSTITUTION_CIPHER_KEY);
cipherText = simpleSubstitutionCipher.Encrypt(cipherText);
return(cipherText);
}