TSG-Terminals Working Group 3 (USIM) #8	TdocT3-99244
Bonn 23rd – 27th Aug., 1999	

Title:	Unclear procedure and item for USIM security feature

Source:	NTT DoCoMo 

Status:	Discussion
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1.	Introduction
This document describes unclear procedure and items for USIM security feature. (Refer to “Security Requirements for USIM”) We want discusses with S2, S3 and T3 and solves these issues.

2.	List of Unclear procedure and items
Unclear things listed in Table 1.

Item
No.	Key word	Description	Consideration	Remarks	
1	TMUIO, TMUIn	Registered Old and New Temporary Identity.	Modify of EFLOCI and new EFLOCIO.
Is it necessary for packet switched?	How to use.	
2	SEQ_UIC	Use for EMUI computation.	Is it stored in USIM?
Is it secretly?
What is initial value of SQN?
Is it generate	How to generate.	
3	Mutual authentication	Authentication for NW.	Is it a mandatory or optional?		
4	SQN
and other options	Authentication for NW.	What is need EF file?
Is it secretly?
What is initial value of SQN?	How to use.	
5	KSI	Re-use Key set identifier.	Is it necessary for packet switched?	Why is it 32 bits?
We think it so long.	
6	IK	Integrity Key	Does it need both modes CS and PS?	How to use.	
7	Key Lifetime,
Key use counter	Particular key is not used for an unlimited period of time. 	Which is parameter decide by operator?
Is it necessary for packet switched?	How to use.	
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3.	Conclusion
We want above things will be solved at the meeting. And, these results reflect to appropriate things.