code: public void remove(SshPublicKey key) throws SshException,
  			PublicKeySubsystemException {
  
  		try {
  
  			Packet msg = createPacket();
  			msg.writeString("remove");
  			msg.writeString(key.getAlgorithm());
  			msg.writeBinaryString(key.getEncoded());
  
  			sendMessage(msg);
  
  			readStatusResponse();
  
  		} catch (IOException ex) {
  			throw new SshException(ex);
  		}
  	}
docs: Remove a public key from the users list of acceptable keys.
  
  @param key
  @throws SshException
  @throws PublicKeyStatusException