TSG-SA WG3 (Security) meeting #4	TSGS-WG3#4(99)192
London, UK, 16-18 June 1999	

Source:	3GPP TSG SA 3 (Security)

To:	3GPP TSG SA 2

Title:	Time constraints on the cexecution of cryptographic algorithms 

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 respond in due time SA 3 kindly asks T3 to provide values for the following:
	X4	Response time for the calculation of RES by the USIM.
	X5	Response time for the calculation of CK and IK by the USIM.
	X9	Response time for the calculation of an authentication vector in the HLR/AuC.
	X11	Response time for the encryption of a user identity in the USIM.
	X12	Response time for the decryption of a user identity in the HLR/AuC.
X4 and X5 will be used in the following 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.”
X1—X3 to be determined by T3.
X9 will be used in the following requirement on the functions for authentication and key agreement [1, §5.1.5]:
“The functions f0—f5 shall be designed so that they can be implemented either in software in the AuC on a X6-bit microprocessor running at X7 MHz and X8 kbits of memory and produce MAX-A, XRES, CK, IK and AK in less than X9 ms.”
X7 and X8 to be determined by CN.
X11 will be used in the following requirement on the functions for enhanced user identity confidentiality [1, §5.2.5]:
“The functions f6 shall be designed so that it can be implemented on an IC card equipped with a X1-bit microprocessor running at X2 MHz with X3 kbits of memory and produce EMUI in less than X11 ms.”
X1—X3 to be determined by T3.
X12 will be used in the following requirement on the functions for enhanced user identity confidentiality [1, §5.2.5]:
“The functions f7 shall be designed so that it can be implemented in software in the AuC on a X6-bit microprocessor running at X7 MHz with X8 kbits of memory and decrypt EMUI in less than X12 ms.”
X7—X8 to be determined by T3.
Reference:
	[1]	S3-99147. 3G TS 33.105 version 0.1.1. 3G Security: Cryptographic Algorithm Requirements.