Patent ID: 8578457

Claim:
A method for user authentication in a computer network or Internet to confirm transactions using a mobile phone connected to a mobile Network Operator (MNO) network providing and renting out short code services, the method comprising: an Administrator of a web server registering or leasing in its name at least one MNO's MSISDN Server mobile phone number or at least one MNO's Short Number Server short code, said user registering with the web server at least one MSISDN User personal mobile phone number, a user login, and a password, said web server, for said user authentication, sending via said computer network or Internet to said user a code message, said user subsequently sending the code message to the web server by a user's mobile phone from the MSISDN User personal mobile phone number via the MSISDN Server mobile phone number or from the MSISDN User personal mobile phone number to the Short Number Server short code.