The following conceptual diagram relates Decaf and Ristretto. More details on its interpretation will be added in the future.

The right-hand column, groups & encodings, connects the byte strings produced by the encoding (middle, far right), to the quotient group constructed by Ristretto (bottom, far right), via all intermediate structures. (In practice, the encoding formulas pass directly from beginning to end; this is a conceptual diagram).

The center column, curves & isogenies, shows the relevant curves and their relationships.

The left-hand column, ristretto255 parameters, shows the concrete parameter choices used for ristretto255.