The term firewall has seen limited use since the late 1980s to describe a device to block unwanted network traffic while allowing other traffic to pass. The first published description of a "modern" firewall including use of that name was in 'Practical Unix Security' written in 1990 and published in 1991. The first description of a firewall, although not by that name, was also in 1990, in a paper by Bill Cheswick. A few of the industry pioneers tried to track down the origin of the word as described in this context. They found several references from the mid-80's that used the word to describe a damage-limiting device. The earliest use they found that seems to correspond to a security device was by Steve Bellovin, in some email to Phil Karn, in 1987. But the context suggests that Phil knew what Steve meant, yet Steve doesn't think he invented it. What is a network firewal....

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Number Of Words: 236

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