An Useless Cipher

[Oromis92]

Category:

Cryptography

Description:

bah... something stupid, just for exercise.

#!/usr/bin/perl -w

@A = ( '/', '$', '[', ']', '{', '~', ')', '@', '#', '_', ',', ';', '.'
+, ':' );
@B = ( '+', '-', '%', '?', '}', '<', '>', '(', '!' );
@C = ( 0 .. 9, "A" .. "Z", "a" .. "z", '"', '\'', '&', '|', '*', '^', 
+'=' );

print "> ";
$text = <>;
chomp $text;

@text = map( ord ^ 42, split //, $text );
for $i ( 0 .. $#text ) {
    $text[$i] = 0 . sprintf( '%b', $text[$i] ) while length $text[$i] 
+< 8;
    @bits = split //, $text[$i] ;
    for $j ( 0 .. $#bits ) {
        $bits[$j] =~ s/1/x/;
        $bits[$j] =~ s/0/1/;
        $bits[$j] =~ s/x/0/;
    }
    @bits = split //, ( $bits[4] . $bits[5] . $bits[6] . $bits[7] . $b
+its[0] . $bits[1] . $bits[2] . $bits[3] );
    for $j ( 0 .. $#bits ) {
        $output .= $A[ int( rand(@A) ) ] if $bits[$j] eq "0";
        $output .= $B[ int( rand(@B) ) ] if $bits[$j] eq "1";
        $output .= $C[ int( rand(@C) ) ] if int( rand(100) ) < 42;
    }
}

print "\n$output\n";

[jwkrahn]

    for $j ( 0 .. $#bits ) {
        $bits[$j] =~ s/1/x/;
        $bits[$j] =~ s/0/1/;
        $bits[$j] =~ s/x/0/;
    }

Or simply:

    tr/01/10/ for @bits;