private byte[] nextKeyMix(int length, Collection<String> members) {
		byte[] keyMix = new byte[length];
		synchronized(keychain) {
			for(String alias: members) {
				KeyNoncePair knp = keychain.get(alias);
				knp.encrypt(keyMix);
			}	
		}
		Debugger.println("keys", "[KeyHandler] Station "+ alias+ " has keyMix: " + Arrays.toString(keyMix));
		return keyMix;
	}