Encrypt, decrypt using Rails

Question

I saw a while ago the possibility to decrypt and encrypt strings in rails without including any library, but I can\'t find the blog post.

I want to be able to encrypt an

Answer 1

Rails 5 update:

crypt = ActiveSupport::MessageEncryptor.new(Rails.application.secrets.secret_key_base[0..31])
encrypted_data = crypt.encrypt_and_sign('my confidental data')

Rails 5.x Needs a key of exactly 32 bytes.

To verify a previously signed message with a longer key:

crypt = ActiveSupport::MessageEncryptor.new(Rails.application.secrets.secret_key_base[0..31], Rails.application.secrets.secret_key_base)
encrypted_data = crypt.encrypt_and_sign('my confidental data')

as described in the docu

and the discussion on this change