Crypt::Skip32::Base32Crockford - Create url-safe encodings of 32-bit values


  use Crypt::Skip32::Base32Crockford;
  my $key    = pack( 'H20', "112233445566778899AA" ); # Always 10 bytes!
  my $cipher = Crypt::Skip32::Base32Crockford->new($key);
  my $b32    = $cipher->encrypt_number_b32_crockford(3493209676); # 1PT4W80
  my $number = $cipher->decrypt_number_b32_crockford('1PT4W80'); # 3493209676


This module melds together Crypt::Skip32 and Encode::Base32::Crockford.

Crypt::Skip32 is a 80-bit key, 32-bit block cipher based on Skipjack. One example where Crypt::Skip32 has been useful: You have numeric database record ids which increment sequentially. You would like to use them in URLs, but you don't want to make it obvious how many X's you have in the database by putting the ids directly in the URLs.

Encode::Base32::Crockford creates a 32-symbol notation for expressing numbers in a form that can be conveniently and accurately transmitted between humans and computer systems.

Putting the two together lets you have numeric database records ids which you can use safely in URLs without letting users see how many records you have or letting them jump forward or backwards between records.

You should pick a different key to the one in the synopsis. It should be 10 bytes.


Leon Brocard <>.


This code is distributed under the same license as Perl.