The IRC Challenge is over. This challenge was extended to a total of 4 forums in the hopes of getting alot of people involved. However, there were just a total of 2 entries . The winner is Hixxy from Techgear for being the least in size...
alias c var %i $len($1),%r | while $mid($1,%i,1) { %r = $+($iif($v1 !isalnum,$v1,$chr($calc(219-$asc($v1)))),%r) | dec %i } | return $left(%r,$len($1))
size: 69kbs
Congradulations, Hixxy