Transport Layer

• process-process data transfer
• 보안 종류
  • SSL (secure socket layer)
  • TLS (transport layer security)

SSL (secure socket layer)

• 특징

  • TCP 사용

• 구조
  

  • 구성요소
    • SSL Record Protocol
      • 
      • message intergirty, confidentiality 를 제공
    • 3 Hihger-layer-protocol
      • SSL exchanges를 관리
        • Hand shake protocol
          
        • SSL change cipher spec protocol
          updating the cipher suite in use -> can cause pending state become current
        • alert protocol
          • waring : connection or security may be unstable
          • fatal : connection or security may be compromised, or an unrecoverable error has occured
  • 제공
    • SSL connection
      • one SSL ession과 associated with
    • SSL session
      • association between client & server
      • created by handshake protocol
      • may share by mutiple SSL connections

  TLS (transport layer security)

• minor diffrences with SSL..

  • record format version number
  • uses HMAC for MAC
  • Pseudo-random function expands secrets
  • additional alert codes
  • soem changes in supoorted ciphers
  • changes in certificate types & negotiations
  • changes in crypto computations & padding