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Rfc4563 The Key ID Information Type for the General Extension Payload in Multimedia Internet KEYing (MIKEY). Kangsan Lee [email protected] Introduction (1/2). MBMS 서비스를 위해 새롭게 정의된 General Extension Payload 를 정의하고 있음 MBMS: Multimedia Broadcast/Multicast Service in 3GPP (Rel6)

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Kangsan Lee [email protected]

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Kangsan lee kslee contela

Rfc4563The Key ID Information Type for the General Extension Payload in Multimedia Internet KEYing (MIKEY)

Kangsan Lee

[email protected]


Introduction 1 2

Introduction (1/2)

  • MBMS 서비스를 위해 새롭게 정의된 General Extension Payload를 정의하고 있음

    • 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

  • MIKEY 메시지의 Key 타입과 ID를 MBMS에서 식별가능


Introduction 2 2

Introduction (2/2)

  • MIKEY

    • 키와 시큐리티 파라미터를 전달

    • Group Key와 키 업데이트(re-keying)을 처리

  • Requirement: 잦은(주기적인/비주기적인) 키 업데이트

    • Subscribers’ inconveniency to publish decryption keys

  • 3 Level Key Management

    • The MBMS User Key (MUK)

      • Point-to-point key

      • Pre-shared key

      • Protect delivery of MSK

    • The MBMS Service Key (MSK)

      • Group key

      • Protect delivery of MTK

    • The MBMS Traffic Key (MTK)

      • Group traffic key

      • Protect SRTP data

      • Regularly updated


Kangsan lee kslee contela

A

MUKA

MIKEYMUKB (MSK)

B

MIKEYMUKA(MSK)

MUKA

BSF

MUKB

BM-SC

MUK: User Key, P2P

MSK: Service Key, group key

MUKB


Kangsan lee kslee contela

A

MIKEYMSK(MTK)

B

BSF

BM-SC

MSK

MSK

MSK

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


G eneral e xtension p ayload key id information 1 2

General Extension Payload- Key ID Information (1/2)

  • Key ID Information 전달을 위한 GEP의 구조

    • Next payload: 다음 Payload가 존재하는지 나타냄

    • Type: General Extension Payload data의 타입을 나타냄

      • Key ID(=3): Payload data가 Key ID Information임을 나타냄

    • Length

    • Key ID Information

      • Variable length

      • 키의 ID와 타입을 전송하는 general payload data

      • Key ID Type sub-payload들로 구성됨


G eneral e xtension p ayload key id information 2 2

General Extension Payload- Key ID Information (2/2)

  • Key ID Type sub-payload의 구조

    • Key ID Type (8 bits)

      • Key ID의 타입을 나타냄

      • Key ID Type

        • MBMS Key Domain ID (0)

        • MBMS Service Key ID (1)

        • MBMS Traffic Key ID (2)

    • Key ID Length (8 bits): Key ID 필드의 길이를 나타냄

    • Key ID

      • Variable length

      • Key의 ID를 정의함


Key delivery

Key Delivery 메시지 구조

  • MSK 전송을 위한 GPE sub-payload

    • Key Domain ID, Key Type ID sub-payload

  • MTK 전송을 위한 GPE sub-payload

    • Key Domain ID, two Key Type ID sub-payload


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