Body Sensor Network: A Modern Survey & Performance Study

Major security requirement

Description

Data storage security requirements

Confidentially

Patient-related data should be kept confidential during storage periods. Especially, its confidentially should be

robust against node compromise and user collusion. Encryption and Access Control List are main methods

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providing data confidentiality.

Integrity

assurance

Patient-related data must not be modified illegally during storage periods

Dependability

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Patient-related data must be readily retrievable when node failure or data erasure happens.

Data access security requirements

Access control (privacy

A fine-grained data access policy shall be enforced to prevent unauthorized access to patient- related data generated by the WBAN.

Accountability

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When a user of the WBAN abuses his/her privilege to carry out unauthorized actions on patient-related data, he/she should be identified and held accountable

Revocability

The privileges of WBAN users or nodes should be deprived in time if they are identified as compromised or behave maliciously.

Non

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repudiation

The origin of a piece of patient-related data cannot be denied by the source that generated it.

Other security requirements

Authentication

The sender of the patient-related data must be authenticated, and injection of data from outside the WBAN should be prevented

Availability

The patient-related data should be accessible even under denial-of-service (DoS) attacks.

5. WBAN APPLICATIONS

The WBAN application targeted IEEE 802.15.6 standard are divided into medical and non medical application as given in fig.2. Medical application include collecting vital information of a patient continuously and forward it a remote monitoring station for further analysis[6]. The huge amount can be used to prevent the occurrence of myocardial infarction and treat various diseases such as gastrointestinal tract, cancer, asthma & neurological disorder. WBAN can also be used to help people with disabilities. For ex retina prosthesis, chips can be planted in human eye to see at an adequate level. Non medical application include monitoring forgetting things, data file transfer, gaming and social networking application. In [7] gaming, sensor in WBAN can collect coordinate movements of character in the same, ex- moving cricket player or capturing the intensity of ball in tennis. The use of WBAN in social networking allows people to exchange digital profile or business allows people to exchange digital profile or business card only by shaking hands.

Fig. 2. WBAN applications

6. RELATED RESEARCH

Several research groups have been developing the implantable or wearable devices for health monitoring in WBAN communications. However, these researches mainly focus on building system architecture and in lesser extent on developing networking protocols. Besides, it is difficult to discover solutions providing security for WBAN and security has generally been covered separately. Extending the scope of technology, there are several security protocols in general sensor networks. Security Protocols for Sensor Networks (SPINS) is a set of protocols for achieving security requirements like confidentiality, integrity and authenticity in sensor networks and uses several symmetric keys to encrypt the data as well as compute the Message Authentication Code (MAC)[4][11].

However, SPINS is only considered in general sensor networks, so that it is inadequate to apply in WBAN as it has environmental features like the human body and limited computing resources. Some researches show the security for sensor nodes in or on the human body in WBAN. They show that the sensors have to make use of cryptographic algorithms to encrypt the data they send to control node and the random number which is used in security protocols can be generated by biometrics[12]. Biometrics approach uses an intrinsic characteristic of the human body as the authentication identity or the means of securing the distribution of a cipher key to secure inter-WBAN communications. At initial stage, several security schemes of WBAN are established by the symmetric cryptosystem due to limited resources, but have problems like delaying the disclosure of the symmetric keys and providing weak security relatively since it is not resilient against physical compromise[13].

Furthermore, the complexity of sensor node’s key managements in WBAN gives each component overload. On the contrary, some researches utilizing the asymmetric cryptosystem in mobile and ad hoc networks also have been proposed, and tried to examine the unique characteristics of WBAN[8][14]. One concern about the asymmetric cryptosystem is a resource constraint problem but recent work has shown that performing ECC consumes a lot less of memory and computing power[12][14]. These researches dealt with a scope of limited WBAN but they exclude the implanted sensor networks. The objective of WBAN is also the implementation of body area network that can contact with everywhere in, on, and out the human body. By comparison, each approach has several issues to be considered in terms of the security services in WBAN. Further, there is a trade-off between performance and security. Related to these, another research group has implemented these two heterogeneous cryptosystems in their research which provides security and privacy to WBAN. In [4], they believe that these two cryptosystems can be applied in the authentication of WBAN depleting each weak point of them at once. They primarily focus on the authentication in the overall coverage of WBAN including in-, on- and out body to provide the strong and adequate security for WBAN.

7. CONCLUSION

WBAN is an emerging and promising technology that will change people’s healthcare experiences revolutionarily. It brings out a new set of challenges in terms of scalability, sensor deployment and density, energy efficiency, security and privacy and wireless technology. In this survey, we have reviewed the current development on Wireless Body Area Network and we focused in security issues faced by this technology. In particular, this work presents an overview of the differences between Wireless Body Area Network and Wireless Sensor Network. We presented differences of architecture in WBAN and other type of Wireless sensor network. Several key applications will benefit from the advanced integration of WBAN and emerging wireless technologies. They include remote health monitoring, military, sports training and many others. It is also important to highlight here that WBAN poses with various type of security problems. Thus, we believe that WBAN requires a strong security system and part of it is authentication. A secured authentication system is extremely needed in various applications WBAN technology particularly in medical and military. The proposed protocol is potentially useful to be utilize in WBAN by satisfying their technical requirements keeping pace with the standardization of IEEE 802.15.6[4]. Our next step is to discover hybrid authentication protocol in providing a strong security system for WBAN.

ACKNOWLEDGMENT

This work is supported by National Institute of Technology, Patna as a part of partial fulfilment of Post Graduate degree in Communication systems for the academic year of 2011-2013.

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