나는 이동 :
def decrypt_session_cookie(cookie)
cookie = CGI.unescape(cookie)
config = Rails.application.config
encrypted_cookie_salt = config.action_dispatch.encrypted_cookie_salt # "encrypted cookie" by default
encrypted_signed_cookie_salt = config.action_dispatch.encrypted_signed_cookie_salt # "signed encrypted cookie" by default
key_generator = ActiveSupport::KeyGenerator.new(config.secret_key_base, iterations: 1000)
secret = key_generator.generate_key(encrypted_cookie_salt)
sign_secret = key_generator.generate_key(encrypted_signed_cookie_salt)
encryptor = ActiveSupport::MessageEncryptor.new(secret, sign_secret)
encryptor.decrypt_and_verify(cookie)
end
출처 : 난 그냥 초기 메시지에서 보낸 쿠키를 해독 할 수 있었다 http://big-elephants.com/2014-01/handling-rails-4-sessions-with-go/
이 방법.