In this paper we propose threshold public key cryptosystem for securing SMS between mobiles using a new method of Encryption and Decryption process of asymmetric cryptography. The mobile plays an important role in the online transactions; today 89% of mobiles communicating with the corporate data and carry the sensitive data like passwords, Bank pin numbers are also stored in the mobile devices, must be secured. The encryption plays an important role in the information security. The most

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... nt aspect needed to be considered while using cryptography to SMS security is the data storage and processing capabilities of the mobile phone. So in this paper we propose new technique HP-RSA (High Performance RSA) mainly helps in reducing the decryption process time, avoids the attacks at mobile devices (insecure data storage) and also reduces network traffic when we send SMS between devices. Considering all aspects in this paper proposed HPRSA provides higher authentication and security to the messages shared, which can be efficiently used in small devices like mobile phones.