Abstract: The rapid increase of current wireless communications and information technologies have been altering humanís lifestyle and social interactions; the next achievement is the smart home environments or spaces. A smart home consists of low capacity devices and wireless networks, and therefore, all working together as a secure system that needs an adequate level of security. Here a lightweight and secure session key establishment scheme for smart home environments is introduced. To establish trust among the network, every sensor and control unit uses a short authentication token and establishes a secure session key. This scheme provides important security attributes including prevention of various popular attacks, such as denial-of-service and eavesdropping attacks. In this smart home environment only the outside devices can be authenticated. To establish group authentication of devices in smart home new scheme is introduced that is threshold cryptography based group authentication. Secure, and efficient group authentication scheme is used that authenticates a group of devices at once. Here presents novel Threshold Cryptography-based Group Authentication scheme for the smart homes which verifies authenticity of all the devices taking part in the group communication. The proposed scheme is implemented for WIFI environment.

Keywords: Public key Searchable Encryption, Semantic Security, Public key Encryption ,Keyword Search, security, Authentication, Threshold cryptography.