The process of making data unreadable by other humans or computers for the purpose of preventing others from gaining access to its contents. Encrypted data is generated using an encryption program such as PGP, encryption machine, or a simple encryption key and appears as garbage until it is decrypted. In order to read or use the data, it must be decrypted, and only those who have the correct password or decryption key can make the data readable again.

Encrypt key:

a=w, b=x, c=y, d=z, e=a, f=b, g=c, h=d, i=e, j=f, k=g, l=h, m=i, n=j, o=k, p=l, q=m, r=n, s=o, t=p, u=q, v=r, w=s, x=t, y=u, and z=v

my (%key, $new);
my $alpha = "abcdefghijklmnopqrstuvwxyz";
my $message = "computer hope free help for everyone";
@alpha = split(//, $alpha);
my $i=1;
foreach $alpha (@alpha) {
  if ($i >= 23) { 
     $i = -3;
  }
  $key{$alpha} = $alpha[$i+3];
  $i++;
}
@message = split(//,$message);
foreach $message (@message) {
if ($message =~/[a-z]/i) {
  $new .= "$key{$message}"; 
} else { 
  $new .= "$message"; }
}
print "Old: $message\nEncrypted: $new\n";

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