Dithering in its simplest form can be understood by observing what happens when we quantise an image with and without modifying the source by random perturbation. In the examples below, a gradient of 256 grey levels is quantised to just black and white. Note how the dithered gradient is able to simulate a smooth transition from start to end.
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When you overload a credential used for authentication by also using it for encryption, the “blast radius” for losing that credential becomes immeasurably larger.
There’s a saying that “abstractions are always leaky”.
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