Using Digital Signatures to Identify Applets
One of the fundamental assumptions of Java's applet security strategy is that you can't trust anyone on the World Wide Web. Such thinking might sound cynical, but what it means in practice is this: Java security assumes that someone might try to write malicious applets, so it prevents anything malicious from being attempted. As a result, any language feature that has potential for abuse has been blocked from use in applets. The prohibited features include the following:
Reading files from the system on which the applet is running
Writing files to the system on which the applet is running
Getting information about a file on the system
Deleting a file on the system
Making a network connection to any machine ...
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