The paper introduces the notion of a prolific IPP code. An IPP code is prolific if all q^n words are descendants. It is shown that linear prolific IPP codes fall into three infinite (`trivial') families, together with a single sporadic example which is ternary of length 4. There are no known examples of prolific IPP codes which are not equivalent to a linear example: the paper shows that for most parameters there are no prolific IPP codes, leaving a relatively small number of parameters unsolved. In the process the paper obtains upper bounds on the size of a (not necessarily prolific) IPP code which are better than previously known bounds.
Category / Keywords: combinatorial cryptography Date: received 18 Jul 2007 Contact author: s blackburn at rhul ac uk Available format(s): PDF | BibTeX Citation Version: 20070807:151337 (All versions of this report) Discussion forum: Show discussion | Start new discussion