Simple Encryption in Ruby without external gems

Question

I need a simple encryption for some text strings. I want to create coupon codes and make them look cool so subsequently created code should look very different. (And besides

Answer 1

I know that you are looking for a no-gem encryption, but still want to offer to those who are here and don't worry about using external gems. Try glogin (I'm the author):

require 'glogin/codec'
codec = GLogin:Codec.new('the secret')
encrypted = codec.encrypt('Hello, world!')
decrypted = codec.decrypt(encrypted)

It's based on OpenSSL and Base58.