(DES decryption key schedule) Sub keys K1; : : : ;K16 may be generated by Algorithm7.83 and used in reverse order, or generated in reverse order directly as follows. Notethat after K16 is generated, the original values of the 28-bit registers C and D are restored(each has rotated 28 bits). Consequently, and due to the choice of shift-values, modifyingAlgorithm 7.83 as follows generates sub keys in order K16; : : : ;K1: replace the left-shiftsby right-shift rotates; change the shift value v1 to 0
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