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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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slide1

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
slide4

A

MUKA

MIKEYMUKB (MSK)

B

MIKEYMUKA(MSK)

MUKA

BSF

MUKB

BM-SC

MUK: User Key, P2P

MSK: Service Key, group key

MUKB

slide5

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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