name: IMSI
full_form: International  Subscriber Identity
context: scope of this key issue. Similarly, the HSS has both the IMSI and the MSISDN. Protecting the information leakage in the HSS is out of scope this key issue. The use of IPsec in S1-MME and S6a is not mandatory. However, when IPsec is adopted, the interfaces S1-MME and S6a are protected and are safe from eavesdrop. These interfaces can therefore be left out from further discussion. NOTE: Storage of long-term identifier in the UE is covered in security area #5. Interfaces and functions that are susceptible to IMSI exposure The Uu interface is clearly susceptible to IMSI exposure due to passive and active attacks. If sending unprotected IMSI in the Uu interface can be avoided, then the existing IMSI catcher attacks will not be effective anymore. The IMSI concealment can either terminate in the eNB or in the core (MME or HSS). In the latter case, the consequence is that the eNB will not know the IMSI either, which is fine because not knowing the IMSI does not hinder the functionality of the
description: The International Mobile Subscriber Identity (IMSI) is a unique identifier assigned to each mobile subscriber. It is used for authentication and identification purposes within the telecommunications network.
explanation: IMSI is classified as a Parameter because it refers to a critical network attribute, specifically an identifier used in the operation of the network. The context highlights its importance in protecting against information leakage and IMSI exposure attacks.
section_title: 5.7.3.2.1	Key issue details
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biotag_Description: O,B-Parameter,I-Parameter,I-Parameter,I-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O