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IV is salt

In my note about 40 bit ciphers, I forgot that the IV performs the
function of salt; Steve Bellovin pointed this out to me, and I'm sure
it was evident to everyone else.

That being a solved problem, then I'd simply like note that a fast 40
bit cipher might be acceptable for many purposes.  I'd never use it,
of course, and you wouldn't, but maybe your brother-in-law would.