Hi guys, ive been working on a script for the last day or so, and ive hit a stumbling block. The script is finished, but i keep getting a syntax error that i just can't find. i havent been perling long so i sorry if this is a bit of a newbie question. This is the code so far

#! /usr/bin/perl -w

use diagnostics;
use strict;
use Getopt::Std;
use Crypt::CBC;

getopt( 'kio', \%opts );

$cipher = Crypt::CBC->new(
    -key    => '$opts{"k"}',
    -cipher => 'Skipjack',
);
$INFILE  = %opts{"i"};
$OUTFILE = %opts{"o"};
open < INFILE  or die "can't open $INFILE: $!";
open > OUTFILE or die "can't open $OUTFILE: $!";
read INFILE, $plaintext;
$chipertext = $cipher->encrypt($plaintext);
print OUTFILE, $chipertext;
close OUTFILE;
close INFILE;
return (0);
[download]

Whenever I run the code I get the following error message:

Global symbol "%opts" requires explicit package name at skipjack.pl.td
+y line 8.
Global symbol "$cipher" requires explicit package name at skipjack.pl.
+tdy line 10.
Global symbol "$INFILE" requires explicit package name at skipjack.pl.
+tdy line 14.
Global symbol "%opts" requires explicit package name at skipjack.pl.td
+y line 14.syntax error at skipjack.pl.tdy line 14, near "%opts{"
Execution of skipjack.pl.tdy aborted due to compilation errors (#1)
    (F) You've said "use strict vars", which indicates that all variab
+les
    must either be lexically scoped (using "my"), declared beforehand 
+using
    "our", or explicitly qualified to say which package the global var
+iable
    is in (using "::").

Uncaught exception from user code:
        Global symbol "%opts" requires explicit package name at skipja
+ck.pl.tdy line 8.
Global symbol "$cipher" requires explicit package name at skipjack.pl.
+tdy line 10.
Global symbol "$INFILE" requires explicit package name at skipjack.pl.
+tdy line 14.
Global symbol "%opts" requires explicit package name at skipjack.pl.td
+y line 14.syntax error at skipjack.pl.tdy line 14, near "%opts{"
Execution of skipjack.pl.tdy aborted due to compilation errors.
[download]

Could anyone help me out with the error and if they see anything that needs improving or changing, I would greatly appricate it.
Thanks

UPDATE:
After following your instructions, i now have a working script. Thankyou

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