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출처

https://www.netmanias.com/en/post/techdocs/5903/lte-security/lte-security-ii-nas-and-as-security

 

LTE Security II: NAS and AS Security

Once LTE authentication is completed, UE and MME share the same KASME. This document describes NAS and AS security setup procedures in which NAS and AS security keys are generated based on KASME, and how control messages and user packets are securely deliv

www.netmanias.com

 

 

Figure 1. Protocol stacks for security setup

 

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