module ActionDispatch::Cookies::ChainedCookieJars

def encrypted

cookies.encrypted[:discount] # => 45

# => Set-Cookie: discount=DIQ7fw==--K3n//8vvnSbGq9dA--7Xh91HfLpwzbj1czhBiwOg==; path=/
cookies.encrypted[:discount] = 45

Example:

This jar requires that you set a suitable secret for the verification on your app's +secret_key_base+.

are both set, legacy cookies encrypted with HMAC AES-256-CBC will be transparently upgraded.
If +config.action_dispatch.encrypted_cookie_salt+ and +config.action_dispatch.encrypted_signed_cookie_salt+

If the cookie was tampered with by the user (or a 3rd party), +nil+ will be returned.
Returns a jar that'll automatically encrypt cookie values before sending them to the client and will decrypt them for read. 
def encrypted
  @encrypted ||= EncryptedKeyRotatingCookieJar.new(self)
end