A remote user authentication scheme without using smart cards
User authentication is one of the fundamental procedures to ensure secure communications over an insecure public network channel. Especially, due to tamper-resistance and convenience in managing a password file, various user authentication schemes using smart cards have been proposed. A smart card however far from ubiquitous because of the high cost of a smart card and the infrastructure requirements. In this paper, we study secure user authentication using only a common storage device such as a universal serial bus (USB) memory, instead of using smart cards. We first show that the existing schemes using smart cards cannot be immediately converted into schemes using a common storage device. We then propose a practical and secure user authentication scheme, capable of supporting the use of the common storage device, which retains all the advantages of schemes using smart cards.
Based on the traditional adaptive multiuser detection method,sum up application of new LMS,RLS,Kalman arithmetics in DS-CDMA Multiuser detection.principles and methods of 3 arithmetics were given and emulation by Matlab.Based on comparing with SIR and errorcode of 3 arrthmetic,Kalman arithmetic show more excellent detection performance.