1/19 BCMCS Support In IS-820-C (Stage 2) Lijun Zhao QUALCOMM July 20th, 2004

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3/19 BCMCS Status Overview Current status: X.P0022 V0.1.0 (TSG-X BCMCS) and S.P0083 V1.2 (TSG-S BCMCS security framework) are currently in very stable shape, V&V now, will be published soon. C.S0054 (HRPD BCMCS) and IS-2000-D (BCMCS feature included) have been published. TSG-A IOS A.S0019 is in V&V, will be published in July-August In order to support end-to-end BCMCS, RUIM is lagging behind. Objective: To support BCMCS service in RUIM standard for cdma2000 and cdma2000 HRPD network

4/19 Overview of KEYS Registration/Root Key: RK Broadcast Access Key: BAK –Should be delivered to R-UIM, not divulged to ME Short term Key: SK –Should be derived in R-UIM from BAK and delivered to ME TK: Derived from RK, used to encrypt/decrypt BAK Authentication-Key: Auth-Key –Derived from RK, used to generate digest response

5/19 Key Management RUIM is provisioned with RK RUIM derives TK from RK and TK_RAND using SHA-1 (f0) RUIM uses TK to decrypt BAK, BAK is stored in RUIM but ME can not access to it RUIM derives SK from BAK and SK_RAND using SHA-1 (f3) and then passes SK to ME RUIM generates Auth_Key for authentication of BCMCS Information Acquisition RUIM generates authorization signature from BAK and timestamp by using EHMAC algorithm (BAK Hash) RUIM generates SRTP session Encryption Key using AES

6/19 Encryption SK provides Link Layer Encryption: RUIM generates SK from BAK and SK_RAND SRTP provides Higher Layer Encryption: RUIM generates SRTP Session Encryption Key from BAK, SK_RAND and Packet Index

7/19 RUIM Vs. ME in terms of BCMCS

8/19 Responsibility of RUIM Generate TK from RK and decrypt BAK by using TK Compute SK and pass it to ME Store Registration Key, BAK, BCMCS_Flow_ID, BAK_ID and BAK_ Expire, Generate Auth-Key from RK and calculate digest response Generate SRTP session Encryption Key using AES Generate authorization signature from BAK and timestamp by using EHMAC algorithm (BAK Hash)

9/19 Responsibility of ME Use SK to decrypt BCMCS content Determine whether to issue RetrieveSK command by checking BAK_ID and SK_RAND Initiate BAK Request and then issue update BAK command Can store BCMCS_FLOW_ID, BAK_ID, BAK_EXPIRE, SK and SK_RAND Determine the expiry of BAK and send delete BAK command

10/19 New UIM EFs/Hidden Files EFs: BAK_Para: Linear Fixed {BCMCS_Flow_ID,BAK_ID,BAK_Expire} UpdatedBAK_Para: Cyclic EF {BCMCS_Flow_ID,BAK_ID, BAK_Expire} HFs (Hidden File): BAK: currently used UpdatedBAK

11/19 ACCESS CONDITIONS BAK_Para UpdatedBAK_Para READCHV1 UPDATEADM INVALIDATEADM REHABILITATEADM

12/19 RUIM Computation Generate SK Generate TK Decrypt BAK using TK Generate Auth_Key Calculate digest response Generate SRTP session encryption key Generate authorization signature

13/19 New Commands/Responses Retrieve SK Command Parameters: Number of parameters: BCMCS_Flow_ID, BAK_ID, SK_RAND Response Parameters: Number of parameters: BCMCS_Flow_ID, SK ManagementOperation Command Parameters: OP_ID, OP_Body Response Parameters: OK, etc Retrieve SRTP SK Command Parameters: BAK_ID, SK_RAND, Packet Index Response Parameters: SRTP SK

14/19 New Commands/Responses(Cont’) Generate Authorization Signature Command Parameters: BCMCS_Flow_ID, BAK_ID, Time Stamp Response Parameters: Auth Signature BCMCS Authentication Command Parameters: RAND, Challenge Response Parameters: response

15/19 Retrieve SK Upon receipt of Encrypted Content IP packet flow from CE: If BCMCS_Flow_ID and BAK_ID are found in EF(BAK_Para), use the corresponding BAK from HF(BAK) to generate SK. Otherwise If the ID pair matches any record in EF(UpdatedBAK_Para), copy the 3 parameters into the EF(BAK_Para), copy the corresponding BAK from HF(UpdatedBAK) to HF(BAK) and use this BAK to generate SK. Otherwise, Return an error status word

16/19 BAK Management Update BAK: –To create a new entry in EF(UpdatedBAK_Para) and put the decrypted BAK into a record in HF(UpdatedBAK) appropriately (one-to-one mapping) –OP_Body: BCMCS_Flow_ID, BAK_ID, BAK_Expire, [BAK], TK_RAND Delete BAK: - To delete record in HF(UpdatedBAK) and EF(UpdatedBAK_Para) - OP_Body: BCMCS_Flow_ID, BAK_ID

17/19 Service Table Add BCMCS service entry in CDMA Service Table.

18/19 BCMCS Exchange Flow

19/19 Further Stage 3 Work Define details of EFs/HFs, and Command/Responses Write the requirements/procedures