Basic HTML version of Foils prepared May 19 99

Foil 149 Principals of Windows and Layers

From Remarks on Internet and Java Security Basic Information Track Computational Science Course CPS616 -- Spring Semester 1999. by Geoffrey Fox, Mehmet Sen
In order to protect signed scripts from tampering, Navigator 4.0 adds a new set of checks at the container level, where a container is a window or layer.
A script, which wants to access the properties of a signed container, should be signed by a superset of principals that signed the container.
If some scripts in a layer are signed by different principals, the special container checks apply to the layer.

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