code: public static KeySet nullOne() {
  		return new KeySet() {
  			@Override
  			public byte[] encrypt(byte[] clearText) {
  				throw new SecurityException("missing rights");
  			}
  
  			@Override
  			public byte[] decrypt(byte[] cypherText) {
  				throw new SecurityException("missing rights");
  			}
  
  			@Override
  			public byte[] sign(byte[] msg) {
  				throw new SecurityException("missing rights");
  			}
  
  			@Override
  			public boolean verify(byte[] msg, byte[] signature) {
  				throw new SecurityException("missing rights");
  			}
  		};
  	}
docs: /* utils