System.out.println("phi(n):..... " + phi_n);
System.out.println("g:.......... " + g);
System.out.println();
}
return new AsymmetricCipherKeyPair(new NaccacheSternKeyParameters(false, g, n, sigma.bitLength()),
new NaccacheSternPrivateKeyParameters(g, n, sigma.bitLength(), smallPrimes, phi_n));
}