Abstract: A secure ID authentication system for authenticating over a multi-channel cellular radio network a response from a user module comprising a SIM card to a request from an application programming interface (API) to authenticate a transaction, in which; a request is sent to an identity application server (IAS) holding a database of user module ID information; the IAS transmits the request over a first channel of the cellular network as a class 2 SMS message to the SIM card; the SIM card causes the request to be displayed on the user module; when a response is entered, the user module encrypts the response and associated data and transmits the encrypted data over a second channel of the cellular network to an over-the-air (OTA) gateway to the IAS; and the IAS decrypts the data and transmits the response to the API.

Abstract: A secure ID authentication system for authenticating over the Internet network a response from a user module such as an Internet-enabled mobile phone or a computer to a request from an application-programming interface (API) to authenticate a transaction, in which; a PIN request is sent to the user module which displays an “enter pin” prompt; the user module encodes a message comprising its user ID and the PIN using a first code and transmits the thus encoded message to an identity application server (IAS) which has a database of user IDs and associated PINs; the IAS encodes the received message using a second code and transmits the thus twice encoded message back to the user module; the user module part decodes the now twice encoded message by reversing the first code and transmits the part decoded message back to the IAS: the IAS fully decodes the message by reversing the second code; the IAS checks the fully decoded message against the database to confirm or otherwise that it holds the combination user ID