S3-99138
Source:	3GPP SA WG3 (Security)

To:		3GPP TSG RAN WG2

Title:		Security Functionality in RAN

Liaison Statement

SA3 considered your liaison statement (your reference TSG R2#3(99) 326) at its meeting on 11-12th May and has the following comments:

The numbering is yours - we have agreed items 1) - 4) and 7) already.

5)	This will be addressed by Tim Wright when he attends your meeting.

6)	The choice here is entirely yours. Our requirement is simply for a 32 bit number, with a 232 cycle time. We also need to know precisely the structure of the number.

On the subject of data integrity and CRC's, the primary difference is that you can design a CRC to detect specific error patterns.  This is not possible with cryptographic integrity checks.

With regard to the meeting, Tim Wright will attend on the 25th and bring with him a paper detailing our requirements for location of the cipher and integrity functions, as well as the information we will need from you for the cipher and integrity algorithm design work.