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imsi-pseudo
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spec: mention that this works for SIM and USIM

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Oliver Smith 2020-04-15 11:14:11 +02:00
parent 7bcddc91b6
commit 763232b34c
1 changed files with 3 additions and 2 deletions
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docs/imsi-pseudo-spec.adoc
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@ -31,8 +31,8 @@ the ME to a new pseudonymous IMSI allocated by the Home Location Register (HLR)
or Home Subscriber Service (HSS). The next pseudonymous IMSI is sent to the SIM or Home Subscriber Service (HSS). The next pseudonymous IMSI is sent to the SIM
via Short Message Service (SMS), then a SIM applet overwrites the IMSI of the via Short Message Service (SMS), then a SIM applet overwrites the IMSI of the
SIM with the new value. The only component that needs to be changed in the SIM with the new value. The only component that needs to be changed in the
network besides the SIM is the HLR/HSS, therefore it should be possible even network besides the SIM/USIM is the HLR/HSS, therefore it should be possible
for a Mobile Virtual Network Operator (MVNO) to deploy this privacy even for a Mobile Virtual Network Operator (MVNO) to deploy this privacy
enhancement. enhancement.
=== Summary of Existing Location Updating Procedures in RAN and CN === Summary of Existing Location Updating Procedures in RAN and CN
@ -170,6 +170,7 @@ pseudonymous IMSI.
=== SIM Provisioning === SIM Provisioning
IMSI pseudonymization as specified by this document works with SIM and USIM.
The HLR is allocating a pseudonymous IMSI for the subscriber. This pseudonymous The HLR is allocating a pseudonymous IMSI for the subscriber. This pseudonymous
IMSI is stored as IMSI on the subscriber's SIM instead of the real IMSI. IMSI is stored as IMSI on the subscriber's SIM instead of the real IMSI.