name: P2P
full_form: Person to Person
context: When content is provisioned from provider into IMS P2P CDS system, IMS P2P CDS system will break content into several segments. Then these segments will be used to calculate their Hash values through some integrity algorithm. The Hash values could be stored in network and transferred to UE peers through PP_s1 interface when a integrity check request is received. The detail procedure is as following: Figure 13 1. IMS P2P CDS system get content from provider. The content will be import to CSS. 2. CSS break content into several segments for P2P transferring preparation. 3. CSS calculate Hash value for each segment. 4. CSS sends content segments and Hash values to CCS. After that, the transferring preparation is finished. 5. When UE (named peer A) uses IMS P2P CDS, it can get content segment from CCS. 6. If peer A wants to verify the content integrity, it should send Hash values request to CCS through PP_s1 interface. NOTE: PP_s1 interface is involved to protect Hash values value from
description: The PP_s1 interface is a communication pathway between network functions in the IMS P2P CDS system. It is specifically used for transferring and protecting Hash values between the Content Control System (CCS) and User Equipment (UE) peers.
explanation: The text refers to the PP_s1 interface as a communication pathway facilitating the transfer of Hash values, which is characteristic of an interface's function in connecting and enabling data exchange between different network components.
section_title: 7.4	Security protection against content tampering and replacement
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