TSG-SA WG3 (Security) meeting #4	TSGS-WG3#4(99)201
London, UK, 16-18 June 1999	

Source:	3GPP SA WG 3 (Security)

To:	3GPP TSG T 3

Title:	Resources for cryptographic algorithms in the USIM 

Liaison Statement

SA 3 is specifying the requirements on the cryptographic algorithms to be used in the 3G mobile system [1]. 
In order for these algorithms to fit on and/or be optimally designed for the equipment on which they are to be executed SA 3 kindly asks T3 to provide characteristic values for the following USIM properties:
	X1	Word size 
	X2	Clock speed
	X3	Memory size
Those values will be used in the follwing requirement on the functions for authentication and key agreement [1, §5.1.5]:
“The functions f1—f5 shall be designed so that they can be implemented on an IC card equipped with a X1-bit microprocessor running at X2 MHz with X3 kbits of memory and produce AK, MAC-A and RES in less than X4 ms, and CK and IK in less than X5 ms.”
X4 and X5 to be determined by SA2.
Reference:
	[1]	S3-99147. 3G TS 33.105 version 0.1.1. 3G Security: Cryptographic Algorithm Requirements.