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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
  • 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
slide6
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
slide7

A

MUKA

MIKEYMUKB (MSK)

B

MIKEYMUKA(MSK)

MUKA

BSF

MUKB

BM-SC

MUK: User Key, P2P

MSK: Service Key, group key

MUKB

slide8

A

MIKEYMSK(MTK)

B

BSF

BM-SC

MSK

MSK

MSK

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

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