Editing Running key cipher (section)

=== Permutation generated running keys ===

A more compact running key can be used if one combinatorially generates text using several start pointers (or combination rules).  For example, rather than start at one place (a single pointer), one could use several start pointers and xor together the streams to form a new running key, similarly skip rules can be used.  What is exchanged then is a series of pointers to the running key book and/or a series of rules for generating the new permuted running key from the initial key text.  (These may be exchanged via [[public key]] encryption or in person.  They may also be changed frequently without changing the running key book.)