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# [WIP] Make IMSI Pseudonymization an optional extension of 3GPP TS
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Relevant specs:
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* 3GPP TS 23.008: Organization of subscriber data
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* Add pseudo IMSI and pseudo_imsi_i optionally to be saved in the HLR
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* "Process Update_Location_HLR" of TS 09.02
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* Cancel location in old VLR/SGSN if IMSI pseudonymization is enabled, and a
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previous pseudonymous IMSI exists for the subscriber
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Optional additions we need to make, and where to make them:
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* Initial provisioning of the SIM: can optionally have a pseudo IMSI
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* During location update, the HLR uses the pseudo IMSI for all communication
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with the VLR / MSC
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* Is there anything to update? We just replace the IMSI, so the SIM and the
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VLR / MSC don't act any different
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* After successful location update:
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* See 2. in README.md
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TODO:
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* extend the list above with the exact sections of the spec, where the new
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information should be placed
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23
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* Is there a spec for SIM applets, or do we put the SIM applet behaviour in the
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regular spec for SIM cards, or mention its behavior in the location update
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related change?
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* describe everything in detail, fill in the full contents for the SMS etc.
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