TSG-Terminals Working Group 3 (USIM) meeting #3	TSGT3#3(99)091
Helsinki 16th - 18th March, 1999	Page 1

Source:	Security Parameters subgroup

Title: Proposed Stage1 Description of Variable Length Security Parameters in 21.11

Agenda Item: 6
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Length of security parameters

In order to allow for enhancements of the security level in UMTS, the following requirements shall be covered:

•	All security-related parameters for UMTS shall be accompanied by a length indicator.
•	It shall be mandatory for the USIM to support variable-length security parameters.
•	If the USIM supports the GSM security mechanisms, fixed length security parameters according to GSM 11.11 shall be supported in addition.