[Cryptography] paragraph with expected frequencies

[Ray Dillinger]

Actually the longer it is the easier it gets, because the "law of large
numbers" in statistics makes the frequency counts more accurate.

An alphabetic substitution is a very simple program; one you've probably
already written to produce the puzzle.

Letting your daughter edit the key, run it, see the changed message, and
edit the key again, interactively, would be fun, a rapid way for her to
get a feel for substitution ciphers, and you could let her look at a
whole page of text while she does it.

				Bear

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