strfry and memfrob (they have manual pages, and i didn't find them on easter, but...) have some good uses:
a co-worker of mine was instructed to write a blackjack game where he used strfry to shuffle the deck. his professor docked him for using an "undocumented interface" -- that worked fine on the schools linux+alpha systems. but after he pointed out to his professor that strfry had manual pages on their system, he was given bonus credit!
a while back, i ran across a patch to Citadel/UX that had a patch to used memfrob to compliment it's "weak" password encryption system. i believe the same author was involved in the lessening of the US export restrictions on ROT-13.
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a co-worker of mine was instructed to write a blackjack game where he used strfry to shuffle the deck. his professor docked him for using an "undocumented interface" -- that worked fine on the schools linux+alpha systems. but after he pointed out to his professor that strfry had manual pages on their system, he was given bonus credit!
a while back, i ran across a patch to Citadel/UX that had a patch to used memfrob to compliment it's "weak" password encryption system. i believe the same author was involved in the lessening of the US export restrictions on ROT-13.