The present disclosure inter alia presents a method of generating a temporary authentication value, for use in a secure transmission to a service provider system having one or several computer servers. The method starts with receiving a first identification data and receiving a security data associated with the first identification data. Thereafter, a hash function is applied to the first identification data and the security data to generate a temporary authentication value. The generated temporary authentication value is divided into a first and a second part. The method thereafter comprises transmitting only the second part of the divided temporary authentication value to the service provider system for verification.