public void vigin ( int dir ){ //viginaere
		String key = JOptionPane.showInputDialog(
				null,
				"Waehle vigin Verschiebung",
				"ANGELUS");

		String text = textarea.getText();
		char[] cipher = new char [ text.length() ];

		for( int i = 0; i < text.length(); i++){
			char c = text.charAt( i );
			int shift = key.charAt( i % key.length() ) - 'A';
			shift *= dir;

			if( c >= 'A' && c <= 'Z' ){
				c += shift;

				if( c > 'Z'){
					c -= 26;


				} else if( c < 'A' ){
					c += 26;
				}
			}
			cipher[ i ] = c; //not a character
		}//end for
		textarea.setText( new String( cipher ) );
	}