EF EPSNSC
SFI: ’18’
文件标识符 6FE4
记录文件, 只有一条记录
>=54字节 (0x36)

为了将存储的EPS NAS security context标记为无效, 可以这么做
1) 记录的所有字节都设置为 ‘FF’
2) KSI ASME 设置为 ’07’
3) the length indicated in the ASME key TLV is set to ’00’.
任选其一

实例

A0    EPS_NAS Security Context Tag
34    后续字节长度
80    key set identifier KSIasme Tag
01
07

81     ASME key (Kasme) Tag
20
072B4966D546CE4B1E8F16416CC9310AC8997464F96E431AACF85E641EB24970

82    Uplink NAS count Tag
04
00000019

83    Downlink NAS count Tag
04
00000013

84    Identifier os selected NAS integirty and encryption alogrithm Tag
01
02

FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF