TSG-T3 (USIM) meeting #2	TSGT3#1(99)043
Munich 17th - 19th February, 1999	Page 1

TSG-SA Working Group 3 (Security)
Docklands, London, 2-4 February 1999

Liaison to TSG-T3 (USIM)

Source: 	TSG-SA WG3 (Security)
Title:		Security Related Parameters

With regard to your Liaison Statement on 'variable length of security-related parameters'.  We have not as yet decided upon the number and size of the security parameters that will be needed for temporary storage in the USIM or terminal handset, or which need to be transferred across the physical interface between the two devices.  However, our best estimate to date is as follows:

•	16 parameters each of maximum length 256 bits
•	All parameters should be accompanied by a length indicator.  This should be 1 byte.  

We would be grateful if you could make provision for this.  We will, of course, keep you informed as we firm up on our security paramaters.

Professor Michael Walker
Convenor TSG-SA WG3 (Security)

5 February 1999