MuGM IEEE MEDIA INDEPENDENT HANDOVER DCN: MuGM Title: Flowchart on VerifyGroupKey and a note on SAID Date Submitted: September, 17, 2013 Presented at IEEE session #58 in Nanjing Authors or Source(s): Yoshikazu Hanatani (Toshiba) Abstract: This contribution provides flowcharts of a generating method and a verification method of VerifyGroupKey, and a note on SAID.

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Verify Group Key Purpose: VerifyGroupKey provides a verifiability for MGK. Each MN which obtained a MGK from a GroupKeyData can verify that all other MNs also obtain the same MGK from the GroupKeyData. VerifyGroupKey prevents a malicious Group Manager and a GroupKeyData with error. Change the name VerifyGroupKey toGroupKeyVerificationCode. VerifyGroupKey is a confusing name MuGM

GKB-Enc A Set of Device Keys MGK GroupKeyData CompleteSubtree GroupKeyVerificatio nCode_Gen Key_Hierachy MIGKCK MIGEK GroupKeyVerificationCode AES-CMAC Block diagram: GroupKeyVerificationCode Verification Fixed String (Ex. 0x ABCDEF) MuGM

GKB-Dec A Device Key MGK GroupKeyData CompleteSubtree GroupKeyVerificatio nCode_Verif Key_Hierachy MIGKCK MIGEK GroupKeyVerificationCode Block diagram: GroupKeyVerificationCode Verification True/False Fixed String (Ex. 0x ABCDEF) MuGM

Flowchart: GroupKeyVerificationCode Generation Start GroupKeyVerificationCode Generation Read following parameters MGK Fixed string (0x ABCDEF) Derive MIGKCK from MGK using the key hierachy. (See 9.4.3) End GroupKeyVerificationCode := AES-CMAC-128(MIGKCK; 0x ABCDEF)

MuGM Flowchart: GroupKeyVerificationCode Verification Start GroupKeyVerificationCode Verification Read following parameters MGK GroupKeyVerificationCode Fixed string (0x ABCDEF) End Output a result of GroupKeyVerificationCode == AES-CMAC-128(MIGKCK; 0x ABCDEF) Derive MIGKCK from MGK using the key hierachy. (See 9.4.3)

On SAID MIHF of PoS can arbitrary decide a SAID for GKB-generated SA. A tuple of Source MIHF Identifier, SAID Group Identifier (Destination MIHF Identifier) and SAID in a message protected by GKB-generated SA shall be unique. A recommended deciding method of the SAID. Assign a group key version for a group ID as the Optional Data MuGM