Shark was the US name for the "Triton" enigma machine used on U-Boats.
The bulk of this code has appeared in Enigma Machine. It's no Dolphin ;-)

It encrypts whatever you type or pipe through it, run the encrypted output through it, and it'll decrypt it.
Warning Enigma was cracked over 50 years ago.

#!/usr/bin/perl
use strict;

                                              my$s=q:$
                                         /=';';%_=map{s/\s
        //g;chomp;/-/;$`,$'}<DAT     A>; $_{$_}=[$_{$_}=~/\w+
/g]for('p','o');my$R=sub{my($n,$r)=@_;$r=  ~s/[a-z]/$n
=uc$&/e  ;sub{return(chr(65+index$r,$_[0])   )if!$#_;
  $r=~/.{$_[1]}/;(substr  ($r=$'.$&,ord($_[0])  -  65,
    1),$'=~/^$n/*1)}};@_   =map{&$R(1,$_{$_})}(@{ $_{
      o}       });%_=map{ /./; $&, $',$',$&}@{$_{p}};$
           /=       "\n";while(<>) { s/[a-z]/$_=uc$& ;m
             y($        a,$i)=1;$_= $ _ {$_}||$_;for$i(1.
              .$#_){(      $_,$a) =  &{$_[$i]}($_,$a)}for
                ($i=$#_;$i-1;){$_=&{$ _[--$i]}( $_)}$_=$_{$_
                   }||$_/oxeig;print}:; ;$s  =~ s/\s//g;eval
                   $s    __END__;1-EKMF   LGDqVZ  XNTOWYHUSPA
                 IBRCJ;3         -AJDKS IR   UXBL HWTMcQGZNPYF
                VOE;2                 -BDFHJLC  P  RTXvZNYEIWGA
                K                          MUSQO;4-ESOVPZjAYQUI
                                                     RHXLNFTGKDC
                                                MWB     ;r-YRUHQ
                                                  SLDPXN  GOKMIE
                                                    BFZCWVJAT;o
                                                     -1,3,2,4,
                                                      r;p-S
                                                      H,AR
                                                     ,KY
                                                     ;
[download]

--

Brother Frankus.

¤