1. An electronic device comprising: a configuration module that provides an interface to the device for data for configuring logic on the device, the configuration data including encrypted configuration data; a first module including circuitry for generating a volatile response that varies among devices fabricated according to a same design as the device; and a cryptographic module coupled to the first module and to the configuration module, the cryptographic module being configured to decrypt the encrypted configuration data according to the response generated by the first module.