Patent ID: 9247429
Filing Date: 2016-01-26
CPC Classification: H04L,H04W

Claim Text:
1. A method for managing subscription information stored on a microprocessor card, the card being pre-provisioned with an associated unique card number, at least one predefined unique master key (K_master) and at least one number generating means, the method comprising: receiving at the microprocessor card a derivation value (SEED) from one of a plurality of trusted parties (TSM), said derivation value (SEED) associated with an identification number (Ki); storing the derivation value (SEED) on the microprocessor card; and generating at the microprocessor card the identification number (Ki) using the number generating means, the derivation value (SEED) and the at least one predefined unique master key (K_master); wherein the identification number (Ki) is configured for authorizing a subscription to a telecommunications network and is provided for provisioning the card with said subscription, wherein the microprocessor card is pre-provisioned with a plurality of predefined unique master keys (K_master), wherein the microprocessor card is further pre-provisioned with root key identifiers corresponding to the respective predefined unique master keys (K_master) and at least two number generating means, thereby providing at least a main number generating means and a back-up number generating means, each number generating means identifying a different one of the predefined unique master keys by said master key identifiers.