Method for personalizing an improved UICC cooperating with a terminal
A method for personalizing a UICC includes: i—sending from the UICC to a D-HSS an attach request message comprising an IMSI with a given MCC/MNC; ii—sending from the D-HSS to the UICC a command and first cryptographic data; iii—computing at the UICC a secret key by using the first cryptographic data; iv—sending from the UICC to the D-HSS a command and second cryptographic data; v—repeating steps ii to iv until the UICC holds the entire first cryptographic data and the D-HSS holds the entire second cryptographic data; vi—computing at the D-HSS the secret key by using the second entire cryptographic data; vii—allocating by the D-HSS a free IMSI belonging to an operator and transferring from the D-HSS to the UICC the free IMSI and other personalization data; viii—personalizing the UICC with the free IMSI, personalization data and the secret key.
1. Method for personalizing an improved Universal Integrated Circuit Card (UICC) cooperating with a terminal, said method comprising:
i—Sending from said improved UICC to an improved Home Subscriber Server (D-HSS) an attach request message comprising an International Mobile Subscriber Identity (IMSI) with a given Mobile Country Code (MCC) and Mobile Network Code (MNC);
ii—Sending from said improved D-HSS to said improved UICC at least a command and a first cryptographic data;
iii—Computing at said improved UICC a secret key by using said first cryptographic data;
iv—Sending from said improved UICC to said improved D-HSS in at least one Authentication failure message a command and a second cryptographic data;
v—Repeating steps ii to iv until said improved UICC holds the entire first cryptographic data and said improved D-HSS holds the entire second cryptographic data;
vi—When said improved D-HSS holds the entire second cryptographic data, computing at said improved D-HSS the same secret key by using said second entire cryptographic data;
vii—Allocating by said improved D-HSS a free IMSI belonging to an operator and transferring from said improved D-HSS to said improved UICC said free IMSI and personalization data; and
viii—Personalizing said improved UICC with said free IMSI, personalization data and said secret key, wherein said improved UICC sends in an Authentication message request an International Mobile Equipment Identity (I MEI) of said terminal with which it cooperates and said improved D-HSS uses the IMEI of said terminal to select a Mobile Network Operator (MNO) for the user of said terminal.
2. Method according to claim 1 , wherein said personalization data is encrypted with said secret key and then transferred from said improved D-HSS to said improved UICC.
3. Method according to claim 2 , wherein said first and second cryptographic data are Diffie-Hellman exchanged numbers, said first cryptographic data being A=g a mod p and said second cryptographic data being B=g b mod p, where p and g are pre-agreed numbers by said improved D-HSS and said improved UICC, “a” being a random number selected by said improved D-HSS and “b” being a random number selected by said improved UICC.
4. Method according to claim 1 , wherein said improved D-HSS sends a command to said improved UICC in an acknowledgement (SAI Ack) message in order to prompt a user to enter the name of an MNO.
5. Method according to claim 1 , wherein said improved D-HSS personalizes said improved UICC by sending subscription data for the selected MNO to said improved UICC, said subscription data containing a specific IMSI, an Integrated Circuit Card Identification (ICCID), an OPc, a Ri and a Ci sent in multiple SAI Ack messages comprising commands.
6. Method according to claim 5 , wherein each of said multiple SAI Ack messages comprise different IMSIs used for correlating the dialogue between said improved D-HSS and said improved UICC.
7. Method according to claim 5 , wherein, once said improved UICC is personalized by the sending of the subscription data, said improved D-HSS provisions the selected MNO with said specific IMSI in order to allow said improved UICC to communicate with said selected MNO.