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Identity-based Cryptography for Securing Mobile Phone Calls

Identity-based Cryptography for Securing Mobile Phone Calls. 2009 International Conference on Advanced Information Networking and Applications Workshops. Matthew Smith, Christian Schridde, Bj ¨orn Agel, Bernd Freisleben. OutLine. Introduction Protocol Implementation Issues

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Identity-based Cryptography for Securing Mobile Phone Calls

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  1. Identity-based Cryptography for Securing Mobile Phone Calls 2009 International Conference on Advanced Information Networking and Applications Workshops Matthew Smith, Christian Schridde, Bj ¨orn Agel, Bernd Freisleben

  2. OutLine • Introduction • Protocol • Implementation Issues • Experimental Results • Conclusions

  3. 1 Introduction • 目前(GSM（第二代）和UMTS（3G） )的加密方式: • 手機送出加密文件給基地台在基地台發送給目的端

  4. 常見的攻擊方式: 1 Introduction

  5. 2 Protocol • The identity-based key agreement protocol SSF (Secure Session Framework) consists of four main algorithms: Setup, Extract, Build SIK, and Compute. • ID-PKG

  6. 2 Protocol 2.2 Key Agreement

  7. 2 Protocol 2.2 Key Agreement

  8. 2 Protocol 2.2 Key Agreement

  9. 2 Protocol 2.2 Key Agreement

  10. 2 Protocol 2.3 Key Agreement Between Domains

  11. 2 Protocol 2.3 Key Agreement Between Domains

  12. 2 Protocol

  13. 3 Implementation Issues • 3.2 Distribution of the Identity Keys • IBEs & PKIs • 3.3 Key Expiration • Mobile phone call encryption is the fact that telephone numbers are reused.

  14. 4 Experimental Results • Nokia N82-1 and a Nokia N95-1 both with an ARM-11 CPU with 330 MHz running Symbian 9.2 FP1. • N = 512, 1024, 2048 and 4096 Bit • rID = 64, 128, 256 and 512 Bit • R = f3, 17, 513, 65537g

  15. 4 Experimental Results

  16. 6 Conclusions • An identity-based key agreement system for mobile telephony in GSM and UMTS networks was presented. • Experimental results based on a Symbian implementation for the Nokia smartphones N95-1 and N82-1 were presented showing that current smartphones are powerful enough to run the presented system.

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