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

Optional method for encryption and decryption

gem 'activesupport'

require 'active_support'

key = SecureRandom.random_bytes(32)
crypt = ActiveSupport::MessageEncryptor.new(key)
encrypted_data = crypt.encrypt_and_sign("your password")
password = crypt.decrypt_and_verify(encrypted_data)