In the age of universal electronic connectivity, of viruses and hackers, of electronic eavesdropping and electronic fraud, there is indeed no time at which security dose not matter. With the introduction of computer, the need for automated tools for protecting files and other information stored on the computer became evident. This is especially the case for a shared system, such as a time sharing system, and the need is even more acute for system that can be accessed over a public telephone ...
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