Integer ID obfuscation techniques

Question

I\'m looking for an easy and reversible method of obfuscating integer IDs. Ideally, I\'d want the resulting obfuscation to be at most eight characters in length and non-seq

Answer 1

I realise this was asked 7 months ago so you will have found a solution by now, but solution I've come across is a combination of Skip32/Skipjack cipher + a base32 encoding. The perl example (since that's where I know of one) shows:

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

I don't know of a c# implementation, but a perl one is http://search.cpan.org/perldoc?Crypt::Skip32::Base32Crockford and the two constituent parts for a ruby one are https://github.com/levinalex/base32 and https://github.com/patdeegan/integer-obfuscator. Between the two of them you should be able to port it to any language you need.