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While ubiquitous Internet access is extremely convenient and enables marvelous new applications for mobile users, it also creates a major security vulnerability—by placing a passive receiver in the vicinity of the wireless transmitter, that receiver can obtain a copy of every packet that is transmitted! These packets can contain all kinds of sensitive information, including passwords, social security numbers, trade secrets, and private personal messages. A passive receiver that records a copy of…

Benefits of direct marketing: Buyers • Home shopping- fun, convenient and hassle free, time saving, larger variety. • Comparative shopping possible- browsing through online catalogues. • Somebody else other than buyer can order goods. • Business customers- learn about new products & services- time saved in meeting sales people. Sellers • Buy mailing lists- any group : left handed, overweight, millionaires • Personalize and customize the messages- build continuous relationship with…