Unless they read this forum, in which case, you just gave away "the code", and it could be reverse engineered.
Either go for truly random (Matt's solution), or completely meaningless (my solution). That's better than something cute with the real data.
- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
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"Nobody knows the age of the human race, but everyone agrees it's old enough to know better." - Anon