4.2.77 EFVGCSCA (Voice Group Call Service Ciphering Algorithm)
31.1023GPPCharacteristics of the Universal Subscriber Identity Module (USIM) applicationRelease 17TS
If service n°64 is "available", this file shall be present.
This EF contains the ciphering algorithm identifiers for each of the Master Group Key (V_Ki) of each VGCS group that the user has subscribed to (defined in EFVGCS).
|
Identifier: ‘6FD4’ |
Structure: transparent |
Optional |
||||
|
File size: 2n bytes, (1 ≤ n ≤ 50) |
Update activity: low |
|||||
|
Access Conditions: READ PIN UPDATE ADM DEACTIVATE ADM ACTIVATE ADM |
||||||
|
Bytes |
Description |
M/O |
Length |
|||
|
1 |
VGCS Group ciphering algorithm identifier for 1st V_Ki of Group 1 |
M |
1 byte |
|||
|
2 |
VGCS Group ciphering algorithm identifier for 2nd V_Ki of Group 1 |
M |
1 byte |
|||
|
3 |
VGCS Group ciphering algorithm identifier for 1st V_Ki of Group 2 |
O |
1 byte |
|||
|
4 |
VGCS Group ciphering algorithm identifier for 2nd V_Ki of Group 2 |
O |
1 byte |
|||
|
: |
: |
: |
: |
|||
|
2n-1 |
VGCS Group ciphering algorithm identifier for 1st V_Ki of Group n |
O |
1 byte |
|||
|
2n |
VGCS Group ciphering algorithm identifier for 2nd V_Ki of Group n |
O |
1 byte |
|||
Ciphering Algorithm Identifier:
Contents: Ciphering Algorithm identifier for the specified Master Group Key of each Voice Call Group
Coding:
|
Value |
|
’00’ no ciphering |
|
’01’ ciphering with algorithm GSM A5/1 |
|
’02’ ciphering with algorithm GSM A5/2 |
|
’03’ ciphering with algorithm GSM A5/3 |
|
’04’ ciphering with algorithm GSM A5/4 |
|
’05’ ciphering with algorithm GSM A5/5 |
|
’06’ ciphering with algorithm GSM A5/6 |
|
’07’ ciphering with algorithm GSM A5/7 |
|
’08’ to ‘FF’ RFU |