Check on the path to gpg and whether or not the user the webserver runs as has permission to run it. And sed.

Update: running with -T (taint) may also be affecting your output. Check out perlsec

s**lil*;  $*=join'',sort split q**;  s;.*;grr; &&s+(.(.)).+$2$1+; $; =
qq-$_-;s,.*,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$*,$/)
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