E.10 Coding of the FPAC and CTS-PIN

3GPP43.020Release 17Security related network functionsTS

The CTS-PIN is a local product key. It is initialised at manufacturer customisation.

At CTS-FP reset, the PIN code value returns to initial manufacturer value.. The CTS-PIN can be modified by the user; a pre-condition is to enter the old CTS-PIN. When remote MMI is used, attachment is performed on the MS/FP interface.

The CTS-PIN cannot be de-activated.

The number of tries is infinite and no blocking mechanism is applied.

The FPAC is coded in 128 bits.

The CTS-PIN is entered by the user of the CTS on the CTS-MS respective on the CTS-FP. The CTS-PIN is presented as a BCD number of decimal digits (0 – 9), each digit coded in four bits.

The number of digits of the CTS-PIN is 8.

The CTS-PIN is copied to the FPAC in order to perform the procedures for checking the CTS-PIN entered by the user. As the number of digits of the CTS-PIN is less than 32, the CTS-ME respective the CTS-FP shall pad the unused digits with « F » (hexadecimal presentation of 16) before it is copied to the FPAC.