PREFIXCODING Version 2.0, an encryption scheme (with authentication) with pseudo-random prefix codes substitution and pseudo-random transposition, has been released: http://s13.zetaboards.com/Crypto/topic/7164646/1/. The code is to my knowledge currently the single open-source implementation available in any programming language of an idea, due to Motashemi and Wayner, to do encryption with Hufmann coding. Version 2.0 is a complete re-write of Version 1 (not announced in this group), following discussions with the author of a more recent paper treating that idea. M. K. Shen