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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

TESLA-in-SRTP Update

Baugher, Carrara


Tesla in srtp version 02 1
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
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


The key id information type for the general extension payload in mikey

The Key ID Information Type for the General Extension Payload in MIKEY

draft-carrara-newtype-keyid-00.txt


Objective
Objective Payload

  • 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


MBMS Payload

  • 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


A Payload

MUKA

MIKEYMUKB (MSK)

B

MIKEYMUKA(MSK)

MUKA

BSF

MUKB

BM-SC

MUK: User Key, P2P

MSK: Service Key, group key

MUKB


A Payload

MIKEYMSK(MTK)

B

BSF

BM-SC

MSK

MSK

MSK

MTK: Traffic Key, group key (eq. TGK/TEK)


General Extension Payload in MIKEY Payload

Key ID Information:


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