name: SI
full_form: Screening Indicator
context: can be applied. In this case the verification of SI can be made in the same way after the integrity protection start. Alternative solution in case when UE is not authenticated to the network is using checksums for SI verification. UE can calculate checksum (using appropriate CRC or hash function) on received SI parameters / configurations every time when new SI is read. In the first RRC Connection Request message the UE can send this checksum, so the network can check whether the SI is correct. Also the indication on which SI parameters / configurations the checksum was calculated should be sent. In case that the UE has wrong SI, the network can instruct the UE to erase it and to re-read later or send the complete SI set which it wants to use. To prevent against further introduce of wrong SI by the attacker, the UE should potentially be able to store more than one SI / configurations set under same identities (namely, received from the network and received from the attacker) during
description: The Screening Indicator (SI) is a parameter used in security and authentication within the 3GPP specification. It involves verification processes to ensure the integrity of SI parameters/configurations received by the User Equipment (UE), including calculations of checksums or hashes for comparison.
explanation: Given the context, SI is classified as a Parameter because it refers to specific data used in the authentication and security procedures between the UE and the network. The focus on verification, calculation of checksums, and storage of multiple sets under different identities further supports this classification.
section_title: Countermeasures
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