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TESLA-in-SRTP Update

TESLA-in-SRTP Update. Baugher, Carrara. TESLA-in-SRTP Version 02 (1). Discussion on the mailing list Index ”i” taken out of TESLA MAC coverage Parameter list updated D_t added Name inconsistencies resolved Log failed verification of the safe condition. TESLA-in-SRTP Version 02 (2).

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TESLA-in-SRTP Update

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  1. TESLA-in-SRTP Update Baugher, Carrara

  2. TESLA-in-SRTP Version 02 (1) • Discussion on the mailing list • Index ”i” taken out of TESLA MAC coverage • Parameter list updated • D_t added • Name inconsistencies resolved • Log failed verification of the safe condition

  3. TESLA-in-SRTP Version 02 (2) • Spelled out presence of external MAC for DoS from non-members • Optional for SRTP • Mandatory for SRTCP • Null packets with TESLA keys for one entire interval after stream stops. • Cleaning-up

  4. The Key ID Information Type for the General Extension Payload in MIKEY draft-carrara-newtype-keyid-00.txt

  5. Objective • Define a new type in the General Extension Payload in MIKEY needed by MBMS • MBMS: Multimedia Broadcast/Multicast Service in 3GPP (Rel6) • functional freeze in December 2004 • The Streaming Scenario uses • SRTP for media protection • MIKEY for key mngt protocol • MBMS requires to identify key type involved in the MIKEY message, and key identity

  6. MBMS • Req: frequent key updates • Subscribers’ inconveniency to publish decryption keys • 3-level key mngt • Peer-to-peer key (MUK) = shared secret • Group key (MSK) = KEK • Traffic group key (MTK) = TEK • Frequent MTK update

  7. A MUKA MIKEYMUKB (MSK) B MIKEYMUKA(MSK) MUKA BSF MUKB BM-SC MUK: User Key, P2P MSK: Service Key, group key MUKB

  8. A MIKEYMSK(MTK) B BSF BM-SC MSK MSK MSK MTK: Traffic Key, group key (eq. TGK/TEK)

  9. General Extension Payload in MIKEY Key ID Information:

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