A New Design of Low Cost Security Coprocessor for Portable Electronic Devices

Security processing provides user authentication and secure communication for portable electronic devices. Security processors for portable electronic devices should occupy small area, consume low power, handle several cryptography algorithms, and provide acceptable performance. This paper presents a low cost security coprocessor architecture based on the design ideas of reconfigurability, scalability and tightly coupled structure, which can achieve four kinds of standard cryptography algorithms on a universal architecture. The new architecture can reduce the area and power consumption of security chip, and improve universality, flexibility and security of the whole system. A new algorithm is implemented by changing the contents of the instruction register in this paper. The low cost security coprocessor targets portable electronic products. Finally, simulation and experiment results are provided to verify the ideas of the paper.