4.2.4 EFKeysPS (Ciphering and Integrity Keys for Packet Switched domain)
31.1023GPPCharacteristics of the Universal Subscriber Identity Module (USIM) applicationRelease 17TS
This EF contains the ciphering key CKPS, the integrity key IKPS and the key set identifier KSIPS for the packet switched (PS) domain.
|
Identifier: ‘6F09’ |
Structure: transparent |
Mandatory |
||||
|
SFI: ’09’ |
||||||
|
File size: 33 bytes |
Update activity: high |
|||||
|
Access Conditions: READ PIN UPDATE PIN DEACTIVATE ADM ACTIVATE ADM |
||||||
|
Bytes |
Description |
M/O |
Length |
|||
|
1 |
Key set identifier KSIPS |
M |
1 byte |
|||
|
2 to 17 |
Ciphering key CKPS |
M |
16 bytes |
|||
|
18 to 33 |
Integrity key IKPS |
M |
16 bytes |
|||
– Key Set Identifier KSIPS.
Coding:
|
b8 |
b7 |
b6 |
b5 |
b4 |
b3 |
b2 |
b1 |
||||||||||||
|
KSIPS |
|||||||||||||||||||
|
bits b4 to b8 are coded 0 |
|||||||||||||||||||
‑ Ciphering key CKPS.
Coding:
– the least significant bit of CKPS is the least significant bit of the 17th byte. The most significant bit of CKPS is the most significant bit of the 2nd byte.
‑ Integrity key IKPS.
Coding:
– the least significant bit of IKPS is the least significant bit of the 33rd byte. The most significant bit of IKPS is the most significant bit of the 18th byte.