## 1 Introduction  
Automated security systems are designed to provide an extra layer of security through user identification followed by authentication to prevent illegal break-in at various entry points. Intelligent home networks and automated corporate security systems nowadays adopt various types of security systems mostly based on a single-layered system, such as an identification (ID) detecting system with radio frequency identification (RFID) or ZigBee tags [1; 2; 3]. When these single-layered systems experience intrusions of user identification, there is usually no backup system to monitor the entry point and track down trespassers. This shortcoming can be supplemented by implementing a multilayered security system [4; 5]. The multilayered security system consists of the main user identification system and a secondary system backing up the main system for additional user authentication. The major challenges that automated security systems now face involve developing methods that cannot be broken into easily in the secondary system.  
In case of the home security system, residents are required only to attach a personal ID tag such as resident card with embedded RFID for authentication. However, at some other highly secured entry points such as the main entrances of corporate and research facilities, it is also required to input a security code and password or scan a fingerprint as an additional authentication process. In the case of the automatic teller machine (ATM), customers are asked to insert a bank card for identification and then input a personalized password for additional authentication. The problem of using a numeric keypad for secondary authentication is that the input combination can be exposed to the person standing behind and decoded easily. An authentication system equipped with a keypad, keyboard, or fingerprint scanner can be damaged unexpectedly and will need to be maintained periodically. Technologies like Bluetooth and RFID would make it possible for ATMs to identify users without them inserting bank cards. In this way, mobile phones with personalized tags could replace bank cards in the near future.  
In this paper, we propose a new authentication scheme with the use of a personal ID tag and haptic gestures for an integrated security system. The haptic passcode recognition module scans for personalized gesture input made with a personal ID tag equipped with an acceleration sensor; this would be hard for non-authorized users to copy since the passcode is generated with haptic gestures instead of in alphanumeric format. We have obtained satisfactory result in terms of accuracy and usability with the suggested haptic authentication scheme.  
In Section 2 of this paper, we elaborate on the integrated architecture of the system and the hardware prototype. In Section 3, the proposed algorithms of the haptic authentication scheme are described. Experiment results on user performance in terms of usability are discussed in Section 4. The possibility of application to mobile phones with the suggested scheme using the same algorithm is explored in Section 5, and future studies to further develop the authentication system are also suggested.