Help needed - for a binary to words encoder/decoder for GnuPG

[Robert J. Hansen]

> Let's assume the following...

Let's not assume anything.  You either have users in such conditions or
you don't.  Design for the users you do have, not the hypothetical users
you imagine having.  I can tell you from bitter experience, hypothetical
users virtually never appear in real life.  The users who *do* appear
normally have use cases you've never even imagined.