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标题: 5G security mode 秘钥推衍  [查看完整版帖子] [打印本页]

时间:  2020-11-9 23:21
作者: 咖啡不解困     标题: 5G security mode 秘钥推衍

CK’,IK’推导:
鉴权成功后,ME和AUSF网元会生成该密钥。长度为128bits。
KDF(Key,S),其中,Key为CK || IK,S值如下:
FC = 0x20,
P0 = SNN,
L0 =length of SNN
P1= SQN⊕AK
L1= length of SQN⊕AK

输出的前128bits为CK’,后128bits为IK’。

KAUSF推导:
primaryauthentication过程成功后,ME和AUSF网元会生成该密钥。长度为256bits。
对于5GAKA:KDF(Key,S), 其中,Key为CK || IK,S值如下:

FC = 0x10,
P0 = SNN,
L0 =length of SNN
P1= SQN⊕AK
L1 =length of SQN Å AK

对于EAPAKA’: KAUSF为EMSK的前256bits。

KSEAF推导:
ME和AUSF网元会根据KAUSF计算生成KSEAF。AUSF网元会将该密钥传递给SEAF网元。长度为256bits。
KDF(Key,S),其中Key为KAUSF,S值为:

FC = 0x6C,
P0 = SNN,
L0 =length of SNN.

KAMF推导:
ME和SEAF网元会根据KSEAF计算生成KAMF。长度为256bits。
KDF(Key,S),其中Key为KSEAF,S值为:

FC = 0x6D
P0 = SUPI
L0 = P0length - number of octets in P0
P1 = ABBAparameter
L1 = P1length - number of octets in P1

KNASint推导:
3GPP接入的NAS信令完保密钥。长度为256bits或者128bits。
KDF(Key,S),其中,Key为KAMF,S值如下:

FC = 0x69,
P0 =algorithm type distinguisher,
L0 =length of algorithm type distinguisher
P1 =algorithm identity
L1 =length of algorithm identity






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