in reply to encrypt / decrypt?
CPAN has a couple of encryption modules like Crypt::CBC or Crypt::Blowfish, you may test them
Read a book on Perl
Written a book on Perl
Contributed to the Perl source code
Debugged someone else's script
Played Perl Golf
Used regular expressions to save the day
Used Perl for a certain amount of time (please specify)
Invested a certain amount of man-hours in learning Perl (please estimate)
Visited at least x Perl related events
(Co)maintain at least x active (up-river) CPAN modules
Forgotten you were not Larry Wall
One can never truly know Perl
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