WTLS%20(Wireless%20Transport%20Layer%20Security) - PowerPoint PPT Presentation

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WTLS%20(Wireless%20Transport%20Layer%20Security)

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Data Integrity. Privacy. Authentication. DoS (Denial of Service) ... Application Data. ServerHello. Certificate [ChangeCipherSpec] Finished. Youngho Choung ... – PowerPoint PPT presentation

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Title: WTLS%20(Wireless%20Transport%20Layer%20Security)


1
WTLS (Wireless Transport Layer Security)
  • Youngho Choung
  • Yhchoung_at_cs.uh.edu

2
Contents
  • Why we need WTLS?
  • What is WTLS?
  • What is TLS (SSL3.0) ?
  • WTLS Functions
  • Security Algorithm
  • WTLS specifications
  • Other Technologies

3
Why we need WTLS ? (1/2)
  • What can we do through the Cell Phone?
  • Communication
  • Using Internet
  • E-commerce
  • On-line banking
  • Trading Stock
  • Electric Cash
  • Electric ID
  • Watching movie, take a picture etc ?

4
Why we need WTLS ? (2/2)
  • Environment problems
  • We need Security Solutions

5
What is WTLS ? (1/2)
6
What is WTLS ? (1/2)
7
What is TLS (SSL3.0) ? (1/3)
  • TLS stand for Transaction Layer Security
  • SSL stand for Secure Socket Layer

8
What is TLS (SSL3.0) ? (2/3)
9
What is TLS (SSL3.0) ? (3/3)
10
WTLS Functions
  • Data Integrity
  • Privacy
  • Authentication
  • DoS (Denial of Service) protection
  • Optional

11
Security AlgorithmHash Function
Any Length Plain Text
Hash Function
MD5, MD4, Hash, SHA-1, etc
Fix length Encrypted Text
12
Security AlgorithmBlock Cipher
13
Security AlgorithmBlock Cipher
14
Security AlgorithmPublic Key
  • Key distribution is difficult
  • Tow Communicants already share a key or have the
    use of a key distribution center
  • Characteristic
  • (public) encryption key ? (private) decryption key

15
Security AlgorithmPublic Key
16
WTLS Specifications (1/5)
  • Handshaking protocol
  • Full handshaking protocol
  • Abbreviated handshaking protocol
  • Optimized handshaking protocol
  • Alert protocol
  • Change Cipher spec protocol
  • Record protocol

17
WTLS Specifications
  • Full handshaking

18
WTLS Specifications
  • Abbreviated handshaking

19
WTLS Specifications
  • Optimized full handshaking

ServerHello Certificate ChangeCipherSpec Finishe
d
ChangCipherSpec Finished Application Data
20
WTLS Specifications (4/5)
  • Alert protocol
  • Change Cipher spec protocol

21
WTLS Specifications (5/5)
  • Record Protocol

22
Lets talk aboutlater..?
  • WALS(Wireless Application Layer Security)
  • WPKI(Wireless Public-Key Infrastructure)
  • WIM(WAP Identity Module References
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