Layer
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Layer – A layer can be imagined as a stack of nearly transparent slides. Each layer represents a component of the image, with the image being a collection of all such components. The bottom layer corresponds to the background layer, while the higher layers represent foreground components.
Individual layers of an image can be viewed and managed through a layer dialog.
Layer in the Context of Block Cipher
In this context, a layer refers to a specific transformation layer or a set of operations applied in a block. A layer is used only once—different layers contain different transformations. In contrast, rounds involve repeating a single transformation in each round. There can be confusion layers, which change the value of the block, diffusion layers, which distribute changes across the entire block in at least one direction, or both.
In some cases, it is recommended to implement multiple operations as a single layer, which can avoid the need for temporary internal memory blocks.
