"3" . _:b6699758 "Involutions have the property that they are their own inverses."@en . _:b6699757 . . _:b6699758 "1996, Alfred J. Menezesm, Paul C. van Oorschot, Scott A. Vanstone, Handbook of Applied Cryptography, CRC Press, page 10:"@en . _:b6699757 "(mathematics) An endofunction whose square is equal to the identity function; a function equal to its inverse."@en . . _:b6699758 . .