Analysis of block ciphers - Reocities：分组密码的分析reocities.pptVIP

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Analysis of block ciphers - Reocities：分组密码的分析reocities.ppt

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Analysis of block ciphers - Reocities：分组密码的分析reocities

Presentation Jing Tan, Umass-Lowell Jing Tan, Umass-Lowell Wireless and its Security Jing Tan Department of Computer Science University of Massachusetts, Lowell jtan@ My message It’s (Wireless Security) not too late, but it’s time to start. History of Wireless The Growth of WLANs Demand for wireless access to LANs is fueled by the growth of mobile device. There will be over a billion mobile devices by 2003, and the wireless LAN market is projected to grow to over US$20 billion by 2003. The Technologies The wireless technologies 802.11 and 802.11b What’s 802.11/802.11b? 802.11 and 802.11b standard In 1997 IEEE published the first world-recognized standard for wireless, 802.11. About two years later, the IEEE published 802.11b, also know as 802.11 High Rate, which specifies the standards for building wireless system that operate with data speeds of up to 11Mbps. Detail of 802.11/802.11b Wireless Architecture Modes 802.11b physical layer 801.11 Media Access Control Layer (MAC) Wireless Architecture Modes Architecture Modes Infrastructure mode (802.11) All stations in the system connect to an access point, not directly to one another. BBS (Basic Service Set) and ESS (Extended Service Set) 802.11b physical layer 802.11b physical layer One of the most valuable additions the 802.11b standard provides is the standardization for the physical layer support of the two new speeds, 5.5Mpbs and 11Mbps. To increase the data rate in 802.11b, advanced coding techniques are described 801.11 Media Access Control Layer (MAC) 801.11 Media Access Control Layer (MAC) 801.11 MAC is designed to support multiple users on a shared medium by having the sender detect and gather information about the medium before accessing it. It is same as the 802.3 Ethernet wire connection. However the protocol employed [CSMA/CD] (carrier sense multiple access with collision detection) details collision handing and redirection. In 801.11, collision detection is not possible because stations cannot listen a