In cryptography, higher-order differential cryptanalysis is a generalization of differential cryptanalysis, an attack against block ciphers. Developed in 1994 by Lars Knudsen, the technique has been applied to a number of ciphers. Whereas ordinary differential cryptanalysis analyzes the differences between two texts, the higher-order variant considers differences between differences, etc. It has been shown to be more powerful than a first-order attack in some cases (see KN-Cipher).
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“But how is one to make a scientist understand that there is something unalterably deranged about differential calculus, quantum theory, or the obscene and so inanely liturgical ordeals of the precession of the equinoxes.”
—Antonin Artaud (1896–1948)