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By Raymond S Nickerson
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Extra resources for Using computers : the human factors of information systems
Example text
DEAFNET provid es not only conventional electro nic mail capability but bulletin boards, news, and w ea t h e r reports as well . T h e p roblem of i n fo rmation security is much greater, of cou rse, when a system is con nected to a n e two rk that m a k e s use of co mmunication l i nes used by the ge n e ra l p u b l ic M i li tar y syste ms for which s ecur i ty is i m portant typically do not use such l i n e s but are "closed" ; th e y use only commu nications facilities that a re dedicated to that particular u s e Secure networks also e m p loy end-to-end encry ption and tightly c o n t r o l l ed user authentication schemes .
The netwo rk was desi gned , i m p le mented, o pe rated , and m a i nta in ed by Bolt B er anek and Newman u nder con tract to ARPA from 1969 to 1 97 5 and th ereafter u n d er con tract t o t h e Defense Communication s A ge ncy , to w h o m re spo nsibil ity for o p e ra tion was trans ferred in 1 9 7 5 . I t is a pac ket-switched , store-and-fo rward n etw o r k (abo ut w hich more l ate r ) that u ses wideband (50-kilobit) ci rcuits leased from AT&T and o ther carriers as the internode com m u nication links ( H e art 197 5 ; McQu illan and Walden 1 97 7 ; Roberts 1973) .
The advan tage of this way of doin g thi n gs is that circuits are not tied up when there is nothing to tran smit (as d u ri n g p a u s e s in phone con versati o n s) ; the method makes m O l e effICient u s e of the available ban d width and th ereby reduces the communication costs . Computi n g resources are needed th roughou t a packet switched network. I n put nodes partition the message into pack ets , attach to ea ch p a c k e t a n ap p rop riate h eader, and decide where to send the packet on the first l e g o f its journey.