On Tue, Mar 14, 2017 at 09:20:37AM +0100, Andreas Tille wrote: > have long periods (the period of each stream is at least 2128) I don't think such a period would be adequate for any real use... Did you mean 2¹²⁸ (U+0032 U+00B9 U+00B2 U+2078), or, for the Unicode-challenged, 2^128? -- ⢀⣴⠾⠻⢶⣦⠀ Meow! ⣾⠁⢠⠒⠀⣿⡁ ⢿⡄⠘⠷⠚⠋⠀ Collisions shmolisions, let's see them find a collision or second ⠈⠳⣄⠀⠀⠀⠀ preimage for double rot13!