A Lightweight and Robust Stream Cipher Based on PI for Intelligent Transportation Systems.

Modern text encryption is mostly based on symmetric encryption. Its efficient and safe encryption method greatly improves the application of intelligent transportation system (ITS), and effectively solves the security problems in data communication and sharing. In symmetric encryption, the stream cipher uses the key stream generated by the key to encrypt the message. Due to the simple implementation and fast encryption and decryption speed, the efficiency of this method is generally higher than other symmetric encryption methods. And because of its one-time pad feature, stream ciphers can effectively resist chosen plaintext attacks. In this paper, a new stream cipher encryption algorithm is proposed, which alternately encrypts plaintext using ratio of the circumference of a circle to its diameter (PI), which can effectively prevent fast correlation attacks. More importantly, as an irrational number, PI not only has good random number characteristics, but also can be quickly generated mathematically, and has stronger security and lighter efficiency performance than existing algorithms. In addition, in terms of speed, each round of iteration produces twice the number of bits than the previous round, which makes the iterative complexity of the proposed scheme lower than the linear growth complexity. On this basis, by using linear feedback shift registers (LFSR), our method conforms to the characteristics of light weight, fast transmission and robust security, which is very suitable for ITS applications. [ABSTRACT FROM AUTHOR]